linux-kernel - [syzbot] [media?] general protection fault in dvb_usbv2_generic

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Message-ID: <000000000000974b090622004b40@google.com>
Date: Fri, 13 Sep 2024 06:35:23 -0700
From: syzbot <syzbot+f9f5333782a854509322@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
	mchehab@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [media?] general protection fault in dvb_usbv2_generic_write

Hello,

syzbot found the following issue on:

HEAD commit:    5dadc1be8fc5 Merge tag 'char-misc-6.11-rc7' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16784e00580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=58a85aa6925a8b78
dashboard link: https://syzkaller.appspot.com/bug?extid=f9f5333782a854509322
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/21e48b60b45c/disk-5dadc1be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/92982a88343c/vmlinux-5dadc1be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2149656ca3d1/bzImage-5dadc1be.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f9f5333782a854509322@...kaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 0 UID: 0 PID: 10852 Comm: syz.3.1595 Not tainted 6.11.0-rc6-syzkaller-00355-g5dadc1be8fc5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:587 [inline]
RIP: 0010:__mutex_lock+0xf2/0xd70 kernel/locking/mutex.c:752
Code: c0 c0 b9 33 9a 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 79 0b 00 00 83 3d bb 28 71 0e 00 75 21 49 8d 7d 60 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 b2 42 38 f6 4d 39 6d 60 0f 85 f3 0a 00 00
RSP: 0018:ffffc9000313ef60 EFLAGS: 00010202
RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffffffff9a33b903
RDX: dffffc0000000000 RSI: ffff888030280000 RDI: 00000000000000c8
RBP: ffffc9000313f0b8 R08: ffffc9000313f027 R09: 0000000000000000
R10: ffffc9000313f000 R11: fffff52000627e05 R12: dffffc0000000000
R13: 0000000000000068 R14: 0000000000000000 R15: ffff888060c51958
FS:  0000000000000000(0000) GS:ffff8880b8800000(0063) knlGS:00000000f5776b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f35653215e8 CR3: 0000000028422000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dvb_usbv2_generic_write+0x26/0x50 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77
 mxl111sf_ctrl_msg+0x143/0x270 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73
 mxl111sf_write_reg+0xd8/0x1f0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:123
 mxl111sf_i2c_start drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:130 [inline]
 mxl111sf_i2c_xfer+0x91e/0x8a30 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813
 __i2c_transfer+0x866/0x21f0
 i2c_transfer+0x271/0x3b0 drivers/i2c/i2c-core-base.c:2304
 i2cdev_ioctl_rdwr+0x452/0x700 drivers/i2c/i2c-dev.c:309
 compat_i2cdev_ioctl+0x7ca/0x8e0 drivers/i2c/i2c-dev.c:576
 __do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
 __se_compat_sys_ioctl+0x51c/0xca0 fs/ioctl.c:950
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf747d579
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 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f577656c EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000707
RDX: 0000000020001100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:587 [inline]
RIP: 0010:__mutex_lock+0xf2/0xd70 kernel/locking/mutex.c:752
Code: c0 c0 b9 33 9a 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 79 0b 00 00 83 3d bb 28 71 0e 00 75 21 49 8d 7d 60 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 b2 42 38 f6 4d 39 6d 60 0f 85 f3 0a 00 00
RSP: 0018:ffffc9000313ef60 EFLAGS: 00010202
RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffffffff9a33b903
RDX: dffffc0000000000 RSI: ffff888030280000 RDI: 00000000000000c8
RBP: ffffc9000313f0b8 R08: ffffc9000313f027 R09: 0000000000000000
R10: ffffc9000313f000 R11: fffff52000627e05 R12: dffffc0000000000
R13: 0000000000000068 R14: 0000000000000000 R15: ffff888060c51958
FS:  0000000000000000(0000) GS:ffff8880b8800000(0063) knlGS:00000000f5776b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000055f273f047f0 CR3: 0000000028422000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c0 c0 b9             	rol    $0xb9,%al
   3:	33 9a 48 c1 e8 03    	xor    0x3e8c148(%rdx),%ebx
   9:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax
   e:	84 c0                	test   %al,%al
  10:	0f 85 79 0b 00 00    	jne    0xb8f
  16:	83 3d bb 28 71 0e 00 	cmpl   $0x0,0xe7128bb(%rip)        # 0xe7128d8
  1d:	75 21                	jne    0x40
  1f:	49 8d 7d 60          	lea    0x60(%r13),%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:	74 05                	je     0x36
  31:	e8 b2 42 38 f6       	call   0xf63842e8
  36:	4d 39 6d 60          	cmp    %r13,0x60(%r13)
  3a:	0f 85 f3 0a 00 00    	jne    0xb33


---
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