From: syzbot <syzbot+c35815bad054e6ad396e@syzkaller.appspotmail.com>
To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
linux-usb@vger.kernel.org, mchehab@kernel.org,
mkrufky@linuxtv.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [media?] [usb?] general protection fault in mxl111sf_ep6_streaming_ctrl
Date: Sat, 26 Sep 2026 15:23:30 -0700 [thread overview]
Message-ID: <6ab845e2.e548f532.1ca396.0033.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 6812ce4e4379 Merge tag 'drm-fixes-2026-09-26' of https://g..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=133dc605580000
kernel config: https://syzkaller.appspot.com/x/.config?x=9d4242cb1c54cdf7
dashboard link: https://syzkaller.appspot.com/bug?extid=c35815bad054e6ad396e
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c77a05580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14d05a05580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/75990baa24e4/disk-6812ce4e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bc9afcf309d7/vmlinux-6812ce4e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/35a3beb2ec93/bzImage-6812ce4e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c35815bad054e6ad396e@syzkaller.appspotmail.com
usb 1-1: dvb_usb_v2: could not submit urb no. 0 - get them all back
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000061: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000308-0x000000000000030f]
CPU: 0 UID: 0 PID: 5651 Comm: syz-executor908 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:mxl111sf_ep6_streaming_ctrl+0x2e/0x2e0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:348
Code: 55 41 57 41 56 41 54 53 89 f5 49 89 fe 49 bc 00 00 00 00 00 fc ff df e8 10 62 93 f9 49 8d 9e 08 03 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 53 66 03 fa 48 8b 1b 48 83 c3 38
RSP: 0018:ffffc900036b7b30 EFLAGS: 00010212
RAX: 0000000000000061 RBX: 0000000000000308 RCX: ffff88807faf0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffc900036b7647 R09: 1ffff920006d6ec8
R10: dffffc0000000000 R11: ffffffff883479d0 R12: dffffc0000000000
R13: ffff8880798113b8 R14: 0000000000000000 R15: ffff8880798108d8
FS: 000055558749c400(0000) GS:ffff888124cca000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbf685aaa20 CR3: 0000000020716000 CR4: 0000000000350ef0
Call Trace:
<TASK>
dvb_usb_start_feed+0x57a/0xc70 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:308
dmx_ts_feed_start_filtering+0x129/0x220 drivers/media/dvb-core/dvb_demux.c:747
dvb_dmxdev_start_feed drivers/media/dvb-core/dmxdev.c:658 [inline]
dvb_dmxdev_filter_start+0x434/0x10d0 drivers/media/dvb-core/dmxdev.c:769
dvb_demux_do_ioctl+0x48b/0x540 drivers/media/dvb-core/dmxdev.c:1099
dvb_usercopy+0x199/0x2e0 drivers/media/dvb-core/dvbdev.c:996
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1208
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbf6855bcf9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff0240de98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbf6855bcf9
RDX: 0000200000000100 RSI: 0000000040146f2c RDI: 0000000000000004
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000009
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000140fe
R13: 00007fff0240deac R14: 00007fff0240dec0 R15: 00007fff0240deb0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mxl111sf_ep6_streaming_ctrl+0x2e/0x2e0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:348
Code: 55 41 57 41 56 41 54 53 89 f5 49 89 fe 49 bc 00 00 00 00 00 fc ff df e8 10 62 93 f9 49 8d 9e 08 03 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 53 66 03 fa 48 8b 1b 48 83 c3 38
RSP: 0018:ffffc900036b7b30 EFLAGS: 00010212
RAX: 0000000000000061 RBX: 0000000000000308 RCX: ffff88807faf0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffc900036b7647 R09: 1ffff920006d6ec8
R10: dffffc0000000000 R11: ffffffff883479d0 R12: dffffc0000000000
R13: ffff8880798113b8 R14: 0000000000000000 R15: ffff8880798108d8
FS: 000055558749c400(0000) GS:ffff888124dca000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff0240ce50 CR3: 0000000020716000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 55 push %rbp
1: 41 57 push %r15
3: 41 56 push %r14
5: 41 54 push %r12
7: 53 push %rbx
8: 89 f5 mov %esi,%ebp
a: 49 89 fe mov %rdi,%r14
d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12
14: fc ff df
17: e8 10 62 93 f9 call 0xf993622c
1c: 49 8d 9e 08 03 00 00 lea 0x308(%r14),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 53 66 03 fa call 0xfa03668c
39: 48 8b 1b mov (%rbx),%rbx
3c: 48 83 c3 38 add $0x38,%rbx
---
This report is generated by a bot. It may contain errors.
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reply other threads:[~2026-09-26 22:23 UTC|newest]
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