[moderation] [media?] KASAN: slab-use-after-free Read in dvb_frontend_release (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 192c0159402e Merge tag 'powerpc-7.0-1' of git://git.kernel..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=124b8e5a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=22c34f040954bbd1
dashboard link: https://syzkaller.appspot.com/bug?extid=420b4c2325b135341a46
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
CC: [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 (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-192c0159.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d1c911c7a5b8/vmlinux-192c0159.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f9d4cfbb614a/bzImage-192c0159.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+420b4c...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in dvb_frontend_release+0x4f3/0x5d0 drivers/media/dvb-core/dvb_frontend.c:2916
Read of size 4 at addr ffff88802caa303c by task syz.1.10074/9483

CPU: 3 UID: 0 PID: 9483 Comm: syz.1.10074 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x156/0x4c9 mm/kasan/report.c:482
kasan_report+0xdf/0x1a0 mm/kasan/report.c:595
dvb_frontend_release+0x4f3/0x5d0 drivers/media/dvb-core/dvb_frontend.c:2916
__fput+0x3ff/0xb40 fs/file_table.c:469
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0x100/0x4a0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x67c/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6009d9bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffeed8f488 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f600a017da0 RCX: 00007f6009d9bf79
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f600a017da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f600a017cb0 R11: 0000000000000246 R12: 00000000000d659a
R13: 00007f600a01609c R14: 00000000000d6378 R15: 00007f600a016090
</TASK>

Allocated by task 1:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kmalloc_noprof include/linux/slab.h:958 [inline]
kzalloc_noprof include/linux/slab.h:1200 [inline]
dvb_register_device+0x1d6/0x1e60 drivers/media/dvb-core/dvbdev.c:475
dvb_register_frontend+0x5a8/0x8a0 drivers/media/dvb-core/dvb_frontend.c:3051
vidtv_bridge_dvb_init drivers/media/test-drivers/vidtv/vidtv_bridge.c:436 [inline]
vidtv_bridge_probe+0x44b/0xa30 drivers/media/test-drivers/vidtv/vidtv_bridge.c:508
platform_probe+0x106/0x1d0 drivers/base/platform.c:1446
call_driver_probe drivers/base/dd.c:583 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:661
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:803
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:833
__driver_attach+0x217/0x5c0 drivers/base/dd.c:1227
bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
bus_add_driver+0x305/0x5b0 drivers/base/bus.c:715
driver_register+0x1e2/0x360 drivers/base/driver.c:249
vidtv_bridge_init+0x38/0x70 drivers/media/test-drivers/vidtv/vidtv_bridge.c:598
do_one_initcall+0x11d/0x690 init/main.c:1378
do_initcall_level init/main.c:1440 [inline]
do_initcalls init/main.c:1456 [inline]
do_basic_setup init/main.c:1475 [inline]
kernel_init_freeable+0x6e5/0x790 init/main.c:1688
kernel_init+0x1f/0x1e0 init/main.c:1578
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 9483:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6674 [inline]
kfree+0x1c7/0x690 mm/slub.c:6886
dvb_free_device drivers/media/dvb-core/dvbdev.c:619 [inline]
kref_put include/linux/kref.h:65 [inline]
dvb_device_put.part.0+0x57/0x90 drivers/media/dvb-core/dvbdev.c:632
dvb_device_put drivers/media/dvb-core/dvbdev.c:171 [inline]
dvb_generic_release+0xe2/0x160 drivers/media/dvb-core/dvbdev.c:169
dvb_frontend_release+0x13d/0x5d0 drivers/media/dvb-core/dvb_frontend.c:2914
__fput+0x3ff/0xb40 fs/file_table.c:469
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0x100/0x4a0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x67c/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802caa3000
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 60 bytes inside of
freed 256-byte region [ffff88802caa3000, ffff88802caa3100)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2caa2
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b842b40 ffffea0000b59380 dead000000000003
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842b40 ffffea0000b59380 dead000000000003
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000001 ffffea0000b2a881 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 20149622858, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1e1/0x250 mm/page_alloc.c:1884
prep_new_page mm/page_alloc.c:1892 [inline]
get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3945
__alloc_frozen_pages_noprof+0x26c/0x2410 mm/page_alloc.c:5240
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0x2c4/0x440 mm/slub.c:3302
___slab_alloc+0xdb3/0x1cb0 mm/slub.c:4656
__slab_alloc.isra.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
__kmalloc_cache_noprof+0x531/0x810 mm/slub.c:5775
kmalloc_noprof include/linux/slab.h:958 [inline]
kzalloc_noprof include/linux/slab.h:1200 [inline]
bus_add_driver+0x92/0x5b0 drivers/base/bus.c:699
driver_register+0x1e2/0x360 drivers/base/driver.c:249
usb_register_driver drivers/usb/core/driver.c:1078 [inline]
usb_register_driver+0x21c/0x3e0 drivers/usb/core/driver.c:1060
do_one_initcall+0x11d/0x690 init/main.c:1378
do_initcall_level init/main.c:1440 [inline]
do_initcalls init/main.c:1456 [inline]
do_basic_setup init/main.c:1475 [inline]
kernel_init_freeable+0x6e5/0x790 init/main.c:1688
kernel_init+0x1f/0x1e0 init/main.c:1578
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
ffff88802caa2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802caa2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802caa3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802caa3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802caa3100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


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