syzbot
WARNING in comedi_unlocked_ioctl
Status:
fixed on 2025/08/26 15:31
Bug presence:
origin:upstream
[Documentation on labels]
Reported-by: syzbot+b2bde13f12963932c08d@syzkaller.appspotmail.com
Fix commit:
08ae4b20f5e8
comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large
First crash: 380d, last: 370d
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Bug presence (1)
| Date |
Name |
Commit |
Repro |
Result |
| 2025/07/12 |
upstream (ToT) |
379f604cc3dc |
C
|
[report] WARNING in comedi_unlocked_ioctl
|
Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8869 at mm/page_alloc.c:5590 __alloc_pages+0x2f4/0x4e0 mm/page_alloc.c:5590
Modules linked in:
CPU: 0 PID: 8869 Comm: syz.0.1025 Not tainted 6.1.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__alloc_pages+0x2f4/0x4e0 mm/page_alloc.c:5590
Code: 0c 25 28 00 00 00 48 3b 8c 24 a0 00 00 00 0f 85 a0 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c6 05 cb 1f 45 0c 01 <0f> 0b eb a5 a9 00 00 08 00 8b 74 24 04 75 3e 44 89 f1 81 e1 7f ff
RSP: 0018:ffffc90003def9c0 EFLAGS: 00010246
RAX: ffffc90003defa00 RBX: 1ffff920007bdf3c RCX: 0000000000000000
RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc90003defa28
RBP: ffffc90003defac0 R08: dffffc0000000000 R09: ffffc90003defa00
R10: fffff520007bdf45 R11: 1ffff920007bdf40 R12: 000000000000001a
R13: 0000000000000000 R14: 0000000000040dc0 R15: dffffc0000000000
FS: 00007fce4ec876c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e51fffc CR3: 00000000552d7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_pages_node include/linux/gfp.h:260 [inline]
__kmalloc_large_node+0x8c/0x1e0 mm/slab_common.c:1077
__do_kmalloc_node mm/slab_common.c:924 [inline]
__kmalloc+0x110/0x240 mm/slab_common.c:949
kmalloc_array include/linux/slab.h:615 [inline]
kcalloc include/linux/slab.h:646 [inline]
comedi_unlocked_ioctl+0x98b/0xe90 drivers/comedi/comedi_fops.c:2237
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fce4dd8e9a9
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:00007fce4ec87038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fce4dfb5fa0 RCX: 00007fce4dd8e9a9
RDX: 0000200000000000 RSI: 000000008010640b RDI: 0000000000000003
RBP: 00007fce4de10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fce4dfb5fa0 R15: 00007ffeec1ad5c8
</TASK>
* Struck through repros no longer work on HEAD.