==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff888012f23180 by task syz.1.11491/10264
CPU: 0 UID: 0 PID: 10264 Comm: syz.1.11491 Not tainted 6.16.0-rc2-syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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:408 [inline]
print_report+0xcd/0x680 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
__kasan_check_byte+0x36/0x50 mm/kasan/common.c:557
kasan_check_byte include/linux/kasan.h:399 [inline]
lock_acquire kernel/locking/lockdep.c:5845 [inline]
lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5828
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
__wake_up_common_lock kernel/sched/wait.c:105 [inline]
__wake_up+0x1c/0x60 kernel/sched/wait.c:127
snd_pcm_action_single+0x10a/0x150 sound/core/pcm_native.c:1306
snd_pcm_action+0x70/0x90 sound/core/pcm_native.c:1387
loopback_check_format sound/drivers/aloop.c:362 [inline]
loopback_trigger+0xd5a/0x1ec0 sound/drivers/aloop.c:410
snd_pcm_do_start sound/core/pcm_native.c:1448 [inline]
snd_pcm_do_start+0xd4/0x1f0 sound/core/pcm_native.c:1441
snd_pcm_action_single+0x80/0x150 sound/core/pcm_native.c:1304
snd_pcm_action+0x70/0x90 sound/core/pcm_native.c:1387
__snd_pcm_lib_xfer+0x1404/0x1ec0 sound/core/pcm_lib.c:2405
snd_pcm_oss_write3+0xcf/0x1e0 sound/core/oss/pcm_oss.c:1241
io_playback_transfer+0x26e/0x2f0 sound/core/oss/io.c:47
snd_pcm_plug_write_transfer+0x2cc/0x400 sound/core/oss/pcm_plugin.c:630
snd_pcm_oss_write2+0x24a/0x410 sound/core/oss/pcm_oss.c:1373
snd_pcm_oss_sync1+0x1b7/0x540 sound/core/oss/pcm_oss.c:1615
snd_pcm_oss_sync+0x5ef/0x840 sound/core/oss/pcm_oss.c:1691
snd_pcm_oss_release+0x28b/0x310 sound/core/oss/pcm_oss.c:2574
__fput+0x402/0xb70 fs/file_table.c:465
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
__do_fast_syscall_32+0x2ac/0x3a0 arch/x86/entry/syscall_32.c:309
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f43579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffdda39c EFLAGS: 00000202 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 000000000000001e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 10266:
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]
snd_pcm_attach_substream+0x441/0xd60 sound/core/pcm.c:938
snd_pcm_open_substream+0x8d/0x17f0 sound/core/pcm_native.c:2750
snd_pcm_oss_open_file sound/core/oss/pcm_oss.c:2438 [inline]
snd_pcm_oss_open+0x735/0x1400 sound/core/oss/pcm_oss.c:2519
soundcore_open+0x40c/0x580 sound/sound_core.c:594
chrdev_open+0x234/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:964
vfs_open+0x82/0x3f0 fs/open.c:1094
do_open fs/namei.c:3887 [inline]
path_openat+0x1de4/0x2cb0 fs/namei.c:4046
do_filp_open+0x20b/0x470 fs/namei.c:4073
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_compat_sys_openat fs/open.c:1514 [inline]
__se_compat_sys_openat fs/open.c:1512 [inline]
__ia32_compat_sys_openat+0x16d/0x210 fs/open.c:1512
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Freed by task 10266:
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
snd_pcm_detach_substream+0x1d7/0x380 sound/core/pcm.c:1003
snd_pcm_release_substream+0x5b/0x70 sound/core/pcm_native.c:2723
snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2397 [inline]
snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2389 [inline]
snd_pcm_oss_release+0x16f/0x310 sound/core/oss/pcm_oss.c:2576
__fput+0x402/0xb70 fs/file_table.c:465
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_int80_emulation+0x352/0x460 arch/x86/entry/syscall_32.c:175
asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:626
The buggy address belongs to the object at ffff888012f23000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 384 bytes inside of
freed 2048-byte region [ffff888012f23000, ffff888012f23800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12f20
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b842f00 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842f00 dead000000000100 dead000000000122
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea00004bc801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7729, tgid 7728 (syz.5.10770), ts 1675749572134, free_ts 1675506183556
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]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_node_track_caller_noprof+0x2ee/0x510 mm/slub.c:4347
kmemdup_noprof+0x29/0x60 mm/util.c:137
kmemdup_noprof include/linux/fortify-string.h:765 [inline]
sctp_sysctl_net_register+0x30/0x200 net/sctp/sysctl.c:606
sctp_defaults_init+0x6c4/0xd80 net/sctp/protocol.c:1413
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:138
setup_net+0x1ff/0x510 net/core/net_namespace.c:442
copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:574
create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218
page last free pid 7696 tgid 7695 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
vfree+0x1fd/0xb50 mm/vmalloc.c:3426
__vmalloc_area_node mm/vmalloc.c:3775 [inline]
__vmalloc_node_range_noprof+0x1162/0x14b0 mm/vmalloc.c:3885
__bpf_map_area_alloc+0x12e/0x200 kernel/bpf/syscall.c:397
prealloc_init kernel/bpf/hashtab.c:324 [inline]
htab_map_alloc+0xa04/0x1570 kernel/bpf/hashtab.c:561
map_create+0x592/0x1db0 kernel/bpf/syscall.c:1477
__sys_bpf+0x47cc/0x4d80 kernel/bpf/syscall.c:5818
__do_sys_bpf kernel/bpf/syscall.c:5943 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5941 [inline]
__ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5941
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Memory state around the buggy address:
ffff888012f23080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888012f23100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888012f23180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888012f23200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888012f23280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi