[moderation] [media?] KASAN: slab-use-after-free Read in vidtv_psi_eit_event_destroy
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syzbot
Aug 2, 2025, 8:27:27 PM8/2/25
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: ced1b9e0392d Merge tag 'ata-6.17-rc1' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15ad0834580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2d532b4b352a3d87
dashboard link: https://syzkaller.appspot.com/bug?extid=1d9c0edea5907af239e0
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
CC: [dwlsa...@gmail.com linux-...@vger.kernel.org linux...@vger.kernel.org mch...@kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/12fe3effe1c1/disk-ced1b9e0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/628c3065e8b7/vmlinux-ced1b9e0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/104f54dc7bd1/bzImage-ced1b9e0.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1d9c0e...@syzkaller.appspotmail.com
RDX: 0010000000000402 RSI: 0000000000006f29 RDI: 0000000000000003
RBP: 00007f00d9410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f00d95b5fa0 R15: 00007fffd52cb458
</TASK>
==================================================================
BUG: KASAN: slab-use-after-free in vidtv_psi_eit_event_destroy+0xe9/0x100 drivers/media/test-drivers/vidtv/vidtv_psi.c:2043
Read of size 8 at addr ffff888032a8af54 by task syz.1.86/6421
CPU: 1 UID: 0 PID: 6421 Comm: syz.1.86 Not tainted 6.16.0-syzkaller-00857-gced1b9e0392d #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
vidtv_psi_eit_event_destroy+0xe9/0x100 drivers/media/test-drivers/vidtv/vidtv_psi.c:2043
vidtv_channel_si_init+0x15cd/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:491
vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519
vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]
vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239
dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973
dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757
dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050
dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00d938e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00da241038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f00d95b5fa0 RCX: 00007f00d938e9a9
RDX: 0010000000000402 RSI: 0000000000006f29 RDI: 0000000000000003
RBP: 00007f00d9410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f00d95b5fa0 R15: 00007fffd52cb458
</TASK>
Allocated by task 6421:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
vidtv_psi_eit_event_init+0xe0/0x3f0 drivers/media/test-drivers/vidtv/vidtv_psi.c:1985
vidtv_channel_eit_event_cat_into_new drivers/media/test-drivers/vidtv/vidtv_channel.c:182 [inline]
vidtv_channel_si_init+0x897/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:439
vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519
vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]
vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239
dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973
dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757
dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050
dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6421:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4842
vidtv_psi_eit_event_destroy drivers/media/test-drivers/vidtv/vidtv_psi.c:2045 [inline]
vidtv_psi_eit_table_destroy+0x133/0x180 drivers/media/test-drivers/vidtv/vidtv_psi.c:2051
vidtv_channel_si_init+0x163d/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:485
vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519
vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]
vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239
dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973
dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757
dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050
dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888032a8af40
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 20 bytes inside of
freed 32-byte region [ffff888032a8af40, ffff888032a8af60)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32a8a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b841780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5565, tgid 5565 (dhcpcd-run-hook), ts 67368240986, free_ts 67310237145
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2333 [inline]
slab_free mm/slub.c:4643 [inline]
kmem_cache_free+0x142/0x4d0 mm/slub.c:4745
vms_complete_munmap_vmas+0x573/0x970 mm/vma.c:1288
__mmap_complete mm/vma.c:2519 [inline]
__mmap_region+0x8e7/0x25e0 mm/vma.c:2630
mmap_region+0x1ab/0x3f0 mm/vma.c:2692
do_mmap+0xa3e/0x1210 mm/mmap.c:561
vm_mmap_pgoff+0x281/0x450 mm/util.c:579
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
page last free pid 0 tgid 0 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
pagetable_free include/linux/mm.h:2884 [inline]
pagetable_dtor_free include/linux/mm.h:2982 [inline]
__tlb_remove_table include/asm-generic/tlb.h:220 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x116/0x1a0 mm/mmu_gather.c:290
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0x799/0x14e0 kernel/rcu/tree.c:2832
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffff888032a8ae00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
ffff888032a8ae80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff888032a8af00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff888032a8af80: 00 00 00 05 fc fc fc fc 00 00 05 fc fc fc fc fc
ffff888032a8b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: ced1b9e0392d Merge tag 'ata-6.17-rc1' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15ad0834580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2d532b4b352a3d87
dashboard link: https://syzkaller.appspot.com/bug?extid=1d9c0edea5907af239e0
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
CC: [dwlsa...@gmail.com linux-...@vger.kernel.org linux...@vger.kernel.org mch...@kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/12fe3effe1c1/disk-ced1b9e0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/628c3065e8b7/vmlinux-ced1b9e0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/104f54dc7bd1/bzImage-ced1b9e0.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1d9c0e...@syzkaller.appspotmail.com
RDX: 0010000000000402 RSI: 0000000000006f29 RDI: 0000000000000003
RBP: 00007f00d9410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f00d95b5fa0 R15: 00007fffd52cb458
</TASK>
==================================================================
BUG: KASAN: slab-use-after-free in vidtv_psi_eit_event_destroy+0xe9/0x100 drivers/media/test-drivers/vidtv/vidtv_psi.c:2043
Read of size 8 at addr ffff888032a8af54 by task syz.1.86/6421
CPU: 1 UID: 0 PID: 6421 Comm: syz.1.86 Not tainted 6.16.0-syzkaller-00857-gced1b9e0392d #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
vidtv_psi_eit_event_destroy+0xe9/0x100 drivers/media/test-drivers/vidtv/vidtv_psi.c:2043
vidtv_channel_si_init+0x15cd/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:491
vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519
vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]
vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239
dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973
dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757
dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050
dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00d938e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00da241038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f00d95b5fa0 RCX: 00007f00d938e9a9
RDX: 0010000000000402 RSI: 0000000000006f29 RDI: 0000000000000003
RBP: 00007f00d9410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f00d95b5fa0 R15: 00007fffd52cb458
</TASK>
Allocated by task 6421:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
vidtv_psi_eit_event_init+0xe0/0x3f0 drivers/media/test-drivers/vidtv/vidtv_psi.c:1985
vidtv_channel_eit_event_cat_into_new drivers/media/test-drivers/vidtv/vidtv_channel.c:182 [inline]
vidtv_channel_si_init+0x897/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:439
vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519
vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]
vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239
dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973
dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757
dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050
dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6421:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4842
vidtv_psi_eit_event_destroy drivers/media/test-drivers/vidtv/vidtv_psi.c:2045 [inline]
vidtv_psi_eit_table_destroy+0x133/0x180 drivers/media/test-drivers/vidtv/vidtv_psi.c:2051
vidtv_channel_si_init+0x163d/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:485
vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519
vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline]
vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239
dmx_section_feed_start_filtering+0x3a8/0x660 drivers/media/dvb-core/dvb_demux.c:973
dvb_dmxdev_filter_start+0x785/0xe10 drivers/media/dvb-core/dmxdev.c:757
dvb_demux_do_ioctl+0xa63/0x12f0 drivers/media/dvb-core/dmxdev.c:1050
dvb_usercopy+0x164/0x340 drivers/media/dvb-core/dvbdev.c:999
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl fs/ioctl.c:584 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888032a8af40
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 20 bytes inside of
freed 32-byte region [ffff888032a8af40, ffff888032a8af60)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32a8a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b841780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5565, tgid 5565 (dhcpcd-run-hook), ts 67368240986, free_ts 67310237145
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2333 [inline]
slab_free mm/slub.c:4643 [inline]
kmem_cache_free+0x142/0x4d0 mm/slub.c:4745
vms_complete_munmap_vmas+0x573/0x970 mm/vma.c:1288
__mmap_complete mm/vma.c:2519 [inline]
__mmap_region+0x8e7/0x25e0 mm/vma.c:2630
mmap_region+0x1ab/0x3f0 mm/vma.c:2692
do_mmap+0xa3e/0x1210 mm/mmap.c:561
vm_mmap_pgoff+0x281/0x450 mm/util.c:579
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
page last free pid 0 tgid 0 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
pagetable_free include/linux/mm.h:2884 [inline]
pagetable_dtor_free include/linux/mm.h:2982 [inline]
__tlb_remove_table include/asm-generic/tlb.h:220 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x116/0x1a0 mm/mmu_gather.c:290
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0x799/0x14e0 kernel/rcu/tree.c:2832
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffff888032a8ae00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
ffff888032a8ae80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff888032a8af00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff888032a8af80: 00 00 00 05 fc fc fc fc 00 00 05 fc fc fc fc fc
ffff888032a8b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
---
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