[v5.15] KASAN: use-after-free Read in l2cap_sock_ready_cb (2)
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syzbot
Apr 12, 2025, 9:53:31 PM4/12/25
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Hello,
syzbot found the following issue on:
HEAD commit: f7347f400572 Linux 5.15.180
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1516b870580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2f42e34471bc17b
dashboard link: https://syzkaller.appspot.com/bug?extid=9fa3c1df7f589b4c063e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3c09658e7170/disk-f7347f40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9939817f914d/vmlinux-f7347f40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/18e0f7a4f25f/bzImage-f7347f40.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9fa3c1...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in l2cap_sock_ready_cb+0xce/0x130 net/bluetooth/l2cap_sock.c:1659
Read of size 8 at addr ffff88807e2844c8 by task kworker/u5:8/4189
CPU: 0 PID: 4189 Comm: kworker/u5:8 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci0 hci_rx_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
l2cap_sock_ready_cb+0xce/0x130 net/bluetooth/l2cap_sock.c:1659
l2cap_chan_ready net/bluetooth/l2cap_core.c:1386 [inline]
l2cap_le_start+0x4fa/0x1e60 net/bluetooth/l2cap_core.c:1498
l2cap_conn_ready net/bluetooth/l2cap_core.c:1767 [inline]
l2cap_connect_cfm+0x72b/0x1270 net/bluetooth/l2cap_core.c:8294
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xd02/0x1500 net/bluetooth/hci_event.c:5429
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5454 [inline]
hci_le_meta_evt+0x28c/0x3f50 net/bluetooth/hci_event.c:6175
hci_event_packet+0xc41/0x1550 net/bluetooth/hci_event.c:6524
hci_rx_work+0x237/0xa10 net/bluetooth/hci_core.c:5160
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Allocated by task 6132:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
kasan_kmalloc include/linux/kasan.h:264 [inline]
__kmalloc+0x168/0x300 mm/slub.c:4407
kmalloc include/linux/slab.h:609 [inline]
sk_prot_alloc+0xe0/0x200 net/core/sock.c:1866
sk_alloc+0x35/0x310 net/core/sock.c:1919
l2cap_sock_alloc+0x34/0x200 net/bluetooth/l2cap_sock.c:1861
l2cap_sock_create+0x10d/0x1c0 net/bluetooth/l2cap_sock.c:1909
bt_sock_create+0x159/0x220 net/bluetooth/af_bluetooth.c:130
__sock_create+0x460/0x8f0 net/socket.c:1486
sock_create net/socket.c:1542 [inline]
__sys_socket+0x132/0x370 net/socket.c:1584
__do_sys_socket net/socket.c:1593 [inline]
__se_sys_socket net/socket.c:1591 [inline]
__x64_sys_socket+0x76/0x80 net/socket.c:1591
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 6131:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0xf1/0x270 mm/slub.c:4559
sk_prot_free net/core/sock.c:1902 [inline]
__sk_destruct+0x593/0x840 net/core/sock.c:1988
l2cap_sock_release+0x157/0x1d0 net/bluetooth/l2cap_sock.c:1429
__sock_release net/socket.c:649 [inline]
sock_close+0xcd/0x230 net/socket.c:1336
__fput+0x3fe/0x8e0 fs/file_table.c:311
task_work_run+0x129/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff88807e284000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1224 bytes inside of
2048-byte region [ffff88807e284000, ffff88807e284800)
The buggy address belongs to the page:
page:ffffea0001f8a000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e280
head:ffffea0001f8a000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888017442000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4182, ts 67630774172, free_ts 62836685830
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192
__alloc_pages+0x272/0x700 mm/page_alloc.c:5466
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
slab_alloc mm/slub.c:3228 [inline]
__kmalloc+0x1c9/0x300 mm/slub.c:4403
kmalloc include/linux/slab.h:609 [inline]
kzalloc include/linux/slab.h:735 [inline]
arpt_alloc_initial_table+0x68/0xc30 net/ipv4/netfilter/arp_tables.c:40
arptable_filter_table_init+0x18/0x60 net/ipv4/netfilter/arptable_filter.c:44
xt_find_table_lock+0x31a/0x3f0 net/netfilter/x_tables.c:1259
xt_request_find_table_lock+0x22/0xf0 net/netfilter/x_tables.c:1284
get_info net/ipv4/netfilter/arp_tables.c:807 [inline]
do_arpt_get_ctl+0x8fd/0x1680 net/ipv4/netfilter/arp_tables.c:1451
nf_getsockopt+0x28e/0x2b0 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x15c3/0x2450 net/ipv4/ip_sockglue.c:1797
tcp_getsockopt+0x25f/0x6ff0 net/ipv4/tcp.c:4313
__sys_getsockopt+0x2a6/0x550 net/socket.c:2247
__do_sys_getsockopt net/socket.c:2262 [inline]
__se_sys_getsockopt net/socket.c:2259 [inline]
__x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2259
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
__d_alloc+0x2a/0x700 fs/dcache.c:1749
d_alloc fs/dcache.c:1828 [inline]
d_alloc_parallel+0xca/0x1390 fs/dcache.c:2582
__lookup_slow+0x111/0x3d0 fs/namei.c:1648
lookup_one_len+0x187/0x2d0 fs/namei.c:2718
start_creating+0x17f/0x310 fs/debugfs/inode.c:354
debugfs_create_dir+0x24/0x480 fs/debugfs/inode.c:559
nsim_dev_port_debugfs_init drivers/net/netdevsim/dev.c:321 [inline]
__nsim_dev_port_add+0x458/0xb90 drivers/net/netdevsim/dev.c:1308
nsim_dev_port_add_all+0x35/0x110 drivers/net/netdevsim/dev.c:1372
Memory state around the buggy address:
ffff88807e284380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e284400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e284480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e284500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e284580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
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syzbot found the following issue on:
HEAD commit: f7347f400572 Linux 5.15.180
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1516b870580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2f42e34471bc17b
dashboard link: https://syzkaller.appspot.com/bug?extid=9fa3c1df7f589b4c063e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3c09658e7170/disk-f7347f40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9939817f914d/vmlinux-f7347f40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/18e0f7a4f25f/bzImage-f7347f40.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9fa3c1...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in l2cap_sock_ready_cb+0xce/0x130 net/bluetooth/l2cap_sock.c:1659
Read of size 8 at addr ffff88807e2844c8 by task kworker/u5:8/4189
CPU: 0 PID: 4189 Comm: kworker/u5:8 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci0 hci_rx_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
l2cap_sock_ready_cb+0xce/0x130 net/bluetooth/l2cap_sock.c:1659
l2cap_chan_ready net/bluetooth/l2cap_core.c:1386 [inline]
l2cap_le_start+0x4fa/0x1e60 net/bluetooth/l2cap_core.c:1498
l2cap_conn_ready net/bluetooth/l2cap_core.c:1767 [inline]
l2cap_connect_cfm+0x72b/0x1270 net/bluetooth/l2cap_core.c:8294
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xd02/0x1500 net/bluetooth/hci_event.c:5429
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5454 [inline]
hci_le_meta_evt+0x28c/0x3f50 net/bluetooth/hci_event.c:6175
hci_event_packet+0xc41/0x1550 net/bluetooth/hci_event.c:6524
hci_rx_work+0x237/0xa10 net/bluetooth/hci_core.c:5160
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Allocated by task 6132:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513
kasan_kmalloc include/linux/kasan.h:264 [inline]
__kmalloc+0x168/0x300 mm/slub.c:4407
kmalloc include/linux/slab.h:609 [inline]
sk_prot_alloc+0xe0/0x200 net/core/sock.c:1866
sk_alloc+0x35/0x310 net/core/sock.c:1919
l2cap_sock_alloc+0x34/0x200 net/bluetooth/l2cap_sock.c:1861
l2cap_sock_create+0x10d/0x1c0 net/bluetooth/l2cap_sock.c:1909
bt_sock_create+0x159/0x220 net/bluetooth/af_bluetooth.c:130
__sock_create+0x460/0x8f0 net/socket.c:1486
sock_create net/socket.c:1542 [inline]
__sys_socket+0x132/0x370 net/socket.c:1584
__do_sys_socket net/socket.c:1593 [inline]
__se_sys_socket net/socket.c:1591 [inline]
__x64_sys_socket+0x76/0x80 net/socket.c:1591
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 6131:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0xf1/0x270 mm/slub.c:4559
sk_prot_free net/core/sock.c:1902 [inline]
__sk_destruct+0x593/0x840 net/core/sock.c:1988
l2cap_sock_release+0x157/0x1d0 net/bluetooth/l2cap_sock.c:1429
__sock_release net/socket.c:649 [inline]
sock_close+0xcd/0x230 net/socket.c:1336
__fput+0x3fe/0x8e0 fs/file_table.c:311
task_work_run+0x129/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff88807e284000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1224 bytes inside of
2048-byte region [ffff88807e284000, ffff88807e284800)
The buggy address belongs to the page:
page:ffffea0001f8a000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e280
head:ffffea0001f8a000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888017442000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4182, ts 67630774172, free_ts 62836685830
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192
__alloc_pages+0x272/0x700 mm/page_alloc.c:5466
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
slab_alloc mm/slub.c:3228 [inline]
__kmalloc+0x1c9/0x300 mm/slub.c:4403
kmalloc include/linux/slab.h:609 [inline]
kzalloc include/linux/slab.h:735 [inline]
arpt_alloc_initial_table+0x68/0xc30 net/ipv4/netfilter/arp_tables.c:40
arptable_filter_table_init+0x18/0x60 net/ipv4/netfilter/arptable_filter.c:44
xt_find_table_lock+0x31a/0x3f0 net/netfilter/x_tables.c:1259
xt_request_find_table_lock+0x22/0xf0 net/netfilter/x_tables.c:1284
get_info net/ipv4/netfilter/arp_tables.c:807 [inline]
do_arpt_get_ctl+0x8fd/0x1680 net/ipv4/netfilter/arp_tables.c:1451
nf_getsockopt+0x28e/0x2b0 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x15c3/0x2450 net/ipv4/ip_sockglue.c:1797
tcp_getsockopt+0x25f/0x6ff0 net/ipv4/tcp.c:4313
__sys_getsockopt+0x2a6/0x550 net/socket.c:2247
__do_sys_getsockopt net/socket.c:2262 [inline]
__se_sys_getsockopt net/socket.c:2259 [inline]
__x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2259
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
__d_alloc+0x2a/0x700 fs/dcache.c:1749
d_alloc fs/dcache.c:1828 [inline]
d_alloc_parallel+0xca/0x1390 fs/dcache.c:2582
__lookup_slow+0x111/0x3d0 fs/namei.c:1648
lookup_one_len+0x187/0x2d0 fs/namei.c:2718
start_creating+0x17f/0x310 fs/debugfs/inode.c:354
debugfs_create_dir+0x24/0x480 fs/debugfs/inode.c:559
nsim_dev_port_debugfs_init drivers/net/netdevsim/dev.c:321 [inline]
__nsim_dev_port_add+0x458/0xb90 drivers/net/netdevsim/dev.c:1308
nsim_dev_port_add_all+0x35/0x110 drivers/net/netdevsim/dev.c:1372
Memory state around the buggy address:
ffff88807e284380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e284400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e284480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e284500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e284580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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syzbot
Jul 21, 2025, 9:53:19 PM7/21/25
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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