On Fri, 10 Jul 2020 10:38:31 +0200, Takashi Iwai wrote: > > On Fri, 10 Jul 2020 10:12:43 +0200, > Zhang, Qiang wrote: > > > > > > > > ________________________________________ > > 发件人: linux-kernel-owner@xxxxxxxxxxxxxxx <linux-kernel-owner@xxxxxxxxxxxxxxx> 代表 syzbot <syzbot+c190f6858a04ea7fbc52@xxxxxxxxxxxxxxxxxxxxxxxxx> > > 发送时间: 2020年7月9日 21:34 > > 收件人: andreyknvl@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; ingrassia@xxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; syzkaller-bugs@xxxxxxxxxxxxxxxx > > 主题: WARNING in submit_audio_out_urb/usb_submit_urb > > > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 768a0741 usb: dwc2: gadget: Remove assigned but never used.. > > git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing > > console output: https://syzkaller.appspot.com/x/log.txt?x=1568d11f100000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=999be4eb2478ffa5 > > dashboard link: https://syzkaller.appspot.com/bug?extid=c190f6858a04ea7fbc52 > > compiler: gcc (GCC) 10.1.0-syz 20200507 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=123aa2fb100000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+c190f6858a04ea7fbc52@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > usb 1-1: send failed (error -32) > > snd_usb_toneport 1-1:0.0: Line 6 TonePort GX now attached > > ------------[ cut here ]------------ > > usb 1-1: BOGUS urb xfer, pipe 0 != type 3 > > WARNING: CPU: 0 PID: 12 at drivers/usb/core/urb.c:478 usb_submit_urb+0xa17/0x13e0 drivers/usb/core/urb.c:478 > > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-rc3-syzkaller #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > > Workqueue: events line6_startup_work > > Call Trace: > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0xf6/0x16e lib/dump_stack.c:118 > > panic+0x2aa/0x6e1 kernel/panic.c:231 > > __warn.cold+0x20/0x50 kernel/panic.c:600 > > report_bug+0x1bd/0x210 lib/bug.c:198 > > handle_bug+0x41/0x80 arch/x86/kernel/traps.c:235 > > exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255 > > asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563 > > RIP: 0010:usb_submit_urb+0xa17/0x13e0 drivers/usb/core/urb.c:478 > > Code: 84 e7 04 00 00 e8 a9 10 ca fd 4c 89 ef e8 41 79 12 ff 41 89 d8 44 89 e1 4c 89 f2 48 89 c6 48 c7 c7 80 a0 5d 86 e8 db 77 9e fd <0f> 0b e8 82 10 ca fd 0f b6 6c 24 08 48 c7 c6 e0 a1 5d 86 48 89 ef > > RSP: 0018:ffff8881da227b10 EFLAGS: 00010086 > > RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 > > RDX: ffff8881da211900 RSI: ffffffff8129b4e3 RDI: ffffed103b444f54 > > RBP: 0000000000000030 R08: 0000000000000001 R09: ffff8881db21fe8b > > R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000 > > R13: ffff8881d6ecd0a0 R14: ffff8881d3d8c690 R15: ffff8881d54c4000 > > submit_audio_out_urb+0x6d6/0x1a00 sound/usb/line6/playback.c:271 > > line6_submit_audio_out_all_urbs+0xc9/0x120 sound/usb/line6/playback.c:291 > > line6_stream_start+0x187/0x230 sound/usb/line6/pcm.c:195 > > line6_pcm_acquire+0x137/0x210 sound/usb/line6/pcm.c:318 > > line6_startup_work+0x42/0x50 sound/usb/line6/driver.c:734 > > process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 > > worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 > > kthread+0x392/0x470 kernel/kthread.c:291 > > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 > > > > It's like Alan Stern's reply to the email titled "KASAN: use-after-free Read in line6_submit_audio_in_all_urbs." It's also like a problem with asynchronous operations. can replace "cancel_delayed_work" with" cancel_delayed_work_sync" > > in "line6_disconnect" func？ > > No, this looks a different problem. It's just a matter of the missing > URB type check that leads to a USB warning. A typical issue with the > USB fuzzing. > > I'll check it later. ... and below is the fix patch. Takashi -- 8< -- From: Takashi Iwai <tiwai@xxxxxxx> Subject: [PATCH] ALSA: line6: Perform sanity check for each URB creation LINE6 drivers create stream URBs with a fixed pipe without checking its validity, and this may lead to a kernel WARNING at the submission when a malformed USB descriptor is passed. For avoiding the kernel warning, perform the similar sanity checks for each pipe type at creating a URB. Reported-by: syzbot+c190f6858a04ea7fbc52@xxxxxxxxxxxxxxxxxxxxxxxxx Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> --- sound/usb/line6/capture.c | 2 ++ sound/usb/line6/playback.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/sound/usb/line6/capture.c b/sound/usb/line6/capture.c index 663d608c4287..970c9bdce0b2 100644 --- a/sound/usb/line6/capture.c +++ b/sound/usb/line6/capture.c @@ -286,6 +286,8 @@ int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) urb->interval = LINE6_ISO_INTERVAL; urb->error_count = 0; urb->complete = audio_in_callback; + if (usb_urb_ep_type_check(urb)) + return -EINVAL; } return 0; diff --git a/sound/usb/line6/playback.c b/sound/usb/line6/playback.c index 01930ce7bd75..8233c61e23f1 100644 --- a/sound/usb/line6/playback.c +++ b/sound/usb/line6/playback.c @@ -431,6 +431,8 @@ int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm) urb->interval = LINE6_ISO_INTERVAL; urb->error_count = 0; urb->complete = audio_out_callback; + if (usb_urb_ep_type_check(urb)) + return -EINVAL; } return 0; -- 2.16.4
