[syzbot] [bluetooth?] KASAN: slab-use-after-free Read in mgmt_remove_adv_monitor_complete

From: syzbot
Date: Mon Oct 14 2024 - 01:56:39 EST

Hello,

syzbot found the following issue on:

HEAD commit: 2b7275670032 Add linux-next specific files for 20240925
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13a332a9980000
kernel config: https://syzkaller.appspot.com/x/.config?x=441f6022e7a2db73
dashboard link: https://syzkaller.appspot.com/bug?extid=4f5eb317dfc1c7e8b003
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/de8e955e430e/disk-2b727567.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cdc30f0c4010/vmlinux-2b727567.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5bce68c83e37/bzImage-2b727567.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4f5eb317dfc1c7e8b003@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0x3b6/0x550 net/bluetooth/mgmt.c:5456
Read of size 2 at addr ffff88801dad4820 by task kworker/u9:4/5243

CPU: 0 UID: 0 PID: 5243 Comm: kworker/u9:4 Not tainted 6.11.0-next-20240925-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
mgmt_remove_adv_monitor_complete+0x3b6/0x550 net/bluetooth/mgmt.c:5456
hci_cmd_sync_work+0x280/0x400 net/bluetooth/hci_sync.c:330
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>

Allocated by task 7589:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:257 [inline]
__do_kmalloc_node mm/slub.c:4265 [inline]
__kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4284
kmemdup_noprof+0x2a/0x60 mm/util.c:133
mgmt_pending_new+0xf0/0x250 net/bluetooth/mgmt_util.c:276
mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296
remove_adv_monitor+0x102/0x1b0 net/bluetooth/mgmt.c:5498
hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712
hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
sock_write_iter+0x2d7/0x3f0 net/socket.c:1166
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7594:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:2343 [inline]
slab_free mm/slub.c:4580 [inline]
kfree+0x1a0/0x440 mm/slub.c:4728
mgmt_pending_free net/bluetooth/mgmt_util.c:308 [inline]
mgmt_pending_remove+0x175/0x1a0 net/bluetooth/mgmt_util.c:315
mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
mgmt_index_removed+0x133/0x390 net/bluetooth/mgmt.c:9407
hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
__sys_bind_socket net/socket.c:1839 [inline]
__sys_bind+0x22d/0x2d0 net/socket.c:1863
__do_sys_bind net/socket.c:1871 [inline]
__se_sys_bind net/socket.c:1869 [inline]
__x64_sys_bind+0x7a/0x90 net/socket.c:1869
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88801dad4820
which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes inside of
freed 8-byte region [ffff88801dad4820, ffff88801dad4828)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dad4
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801ac41500 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080800080 00000001f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 3431344829, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537
prep_new_page mm/page_alloc.c:1545 [inline]
get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
alloc_slab_page+0x6a/0x120 mm/slub.c:2413
allocate_slab+0x5a/0x2f0 mm/slub.c:2579
new_slab mm/slub.c:2632 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819
__slab_alloc+0x58/0xa0 mm/slub.c:3909
__slab_alloc_node mm/slub.c:3962 [inline]
slab_alloc_node mm/slub.c:4123 [inline]
__do_kmalloc_node mm/slub.c:4264 [inline]
__kmalloc_noprof+0x25a/0x400 mm/slub.c:4277
kmalloc_noprof include/linux/slab.h:882 [inline]
kzalloc_noprof include/linux/slab.h:1014 [inline]
acpi_ns_internalize_name+0x419/0x610 drivers/acpi/acpica/nsutils.c:331
acpi_ns_get_node_unlocked drivers/acpi/acpica/nsutils.c:666 [inline]
acpi_ns_get_node+0x1b7/0x3c0 drivers/acpi/acpica/nsutils.c:726
acpi_get_handle+0x19b/0x2a0 drivers/acpi/acpica/nsxfname.c:98
acpi_has_method+0x9e/0xf0 drivers/acpi/utils.c:673
acpi_is_video_device+0x10f/0x2a0 drivers/acpi/scan.c:1306
acpi_set_pnp_ids drivers/acpi/scan.c:1441 [inline]
acpi_init_device_object+0x1e33/0x34e0 drivers/acpi/scan.c:1829
acpi_add_single_object+0x106/0x1e00 drivers/acpi/scan.c:1880
page_owner free stack trace missing

Memory state around the buggy address:
ffff88801dad4700: 02 fc fc fc fa fc fc fc 02 fc fc fc fa fc fc fc
ffff88801dad4780: fa fc fc fc fa fc fc fc fa fc fc fc 00 fc fc fc
>ffff88801dad4800: 00 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
^
ffff88801dad4880: fa fc fc fc fa fc fc fc fa fc fc fc 00 fc fc fc
ffff88801dad4900: fa fc fc fc 05 fc fc fc 05 fc fc fc 05 fc fc fc
==================================================================


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