Date:   Fri, 30 Sep 2022 10:23:23 +0800
From:   "Sabri N. Ferreiro" <snferreiro1@...il.com>
To:     perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: general protection fault in release_urbs

Hi,

When I used fuzz testing to test Linux kernel 6.0.0-rc6, the kernel
triggered the following error:
HEAD commit: 521a547ced6477c54b4b0cc206000406c221b4d6
git tree: upstream

kernel config: https://pastebin.com/raw/hekxU61F
console log: https://pastebin.com/KVwW9VQs

It seems that the fuzzer failed to extract any C reproducer, but I
would so appreciate it if you have any idea how to solve this bug.

general protection fault, probably for non-canonical address
0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
CPU: 1 PID: 29906 Comm: syz-executor.4 Not tainted 6.0.0-rc6+ #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:release_urb_ctx sound/usb/endpoint.c:97 [inline]
RIP: 0010:release_urbs sound/usb/endpoint.c:1046 [inline]
RIP: 0010:release_urbs+0x254/0x5a0 sound/usb/endpoint.c:1031
Code: 44 89 fe 48 c1 e0 08 4c 8b 74 03 58 e8 75 b4 53 fa 45 85 ff 0f
84 29 ff ff ff e8 07 b3 53 fa 49 8d 7e 68 48 89 f8 48 c1 e8 03 <42> 80
3c 20 00 0f 85 32 03 00 00 49 8d 7e 60 49 8b 4e 68 48 89 f8
RSP: 0018:ffffc9001698f8d0 EFLAGS: 00010212
RAX: 000000000000000d RBX: ffff88805fc44000 RCX: 0000000000040000
RDX: ffffc900169d1000 RSI: ffff888018c21d40 RDI: 0000000000000068
RBP: 0000000000000000 R08: ffffffff87273539 R09: 0000000000000000
R10: 0000000000000005 R11: ffffed100bf88805 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000120
FS: 00007febd6e4e700(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555663ddc8 CR3: 0000000065e07000 CR4: 0000000000350ee0
Call Trace:
<TASK>
snd_usb_endpoint_set_params+0x1aab/0x2550
snd_mask_min include/sound/pcm_params.h:49 [inline]
params_format include/sound/pcm_params.h:315 [inline]
snd_usb_hw_params+0x934/0x1180 sound/usb/pcm.c:503
snd_pcm_hw_params+0xbad/0x1da0 sound/core/pcm_native.c:767
snd_pcm_kernel_ioctl+0x164/0x310 sound/core/pcm_native.c:3437
snd_pcm_oss_change_params_locked+0x1834/0x3860 sound/core/oss/pcm_oss.c:976
snd_pcm_oss_change_params+0x76/0xd0 sound/core/oss/pcm_oss.c:1116
snd_pcm_oss_make_ready+0xb7/0x170 sound/core/oss/pcm_oss.c:1175
snd_pcm_oss_get_ptr sound/core/oss/pcm_oss.c:2208 [inline]
snd_pcm_oss_ioctl+0x3cd/0x3270 sound/core/oss/pcm_oss.c:2729
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7febd66a80fd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007febd6e4dbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007febd679c340 RCX: 00007febd66a80fd
RDX: 00000000200000c0 RSI: 00000000800c5011 RDI: 0000000000000003
RBP: 00007febd6e4dc50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000005f
R13: 00007ffc28c4cf7f R14: 00007ffc28c4d120 R15: 00007febd6e4dd80
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:release_urb_ctx sound/usb/endpoint.c:97 [inline]
RIP: 0010:release_urbs sound/usb/endpoint.c:1046 [inline]
RIP: 0010:release_urbs+0x254/0x5a0 sound/usb/endpoint.c:1031
Code: 44 89 fe 48 c1 e0 08 4c 8b 74 03 58 e8 75 b4 53 fa 45 85 ff 0f
84 29 ff ff ff e8 07 b3 53 fa 49 8d 7e 68 48 89 f8 48 c1 e8 03 <42> 80
3c 20 00 0f 85 32 03 00 00 49 8d 7e 60 49 8b 4e 68 48 89 f8
RSP: 0018:ffffc9001698f8d0 EFLAGS: 00010212
RAX: 000000000000000d RBX: ffff88805fc44000 RCX: 0000000000040000
RDX: ffffc900169d1000 RSI: ffff888018c21d40 RDI: 0000000000000068
RBP: 0000000000000000 R08: ffffffff87273539 R09: 0000000000000000
R10: 0000000000000005 R11: ffffed100bf88805 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000120
FS: 00007febd6e4e700(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31424000 CR3: 0000000065e07000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
0: 44 89 fe mov %r15d,%esi
3: 48 c1 e0 08 shl $0x8,%rax
7: 4c 8b 74 03 58 mov 0x58(%rbx,%rax,1),%r14
c: e8 75 b4 53 fa callq 0xfa53b486
11: 45 85 ff test %r15d,%r15d
14: 0f 84 29 ff ff ff je 0xffffff43
1a: e8 07 b3 53 fa callq 0xfa53b326
1f: 49 8d 7e 68 lea 0x68(%r14),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 0f 85 32 03 00 00 jne 0x367
35: 49 8d 7e 60 lea 0x60(%r14),%rdi
39: 49 8b 4e 68 mov 0x68(%r14),%rcx
3d: 48 89 f8 mov %rdi,%rax

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