From: Jaskaran Singh <jaskaransingh7654321@gmail.com>
To: syzbot <syzbot+e7d46eb426883fb97efd@syzkaller.appspotmail.com>,
glider@google.com, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com,
usb-storage@lists.one-eyed-alien.net
Subject: Re: KMSAN: uninit-value in alauda_check_media
Date: Fri, 11 Oct 2019 16:53:15 +0530 [thread overview]
Message-ID: <b8b1e4fef9f3ece63909c38b3302621d76770caa.camel@gmail.com> (raw)
In-Reply-To: <0000000000007d25ff059457342d@google.com>
On Mon, 2019-10-07 at 12:39 -0700, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 1e76a3e5 kmsan: replace __GFP_NO_KMSAN_SHADOW with
> kmsan_i..
> git tree: https://github.com/google/kmsan.git master
> console output:
> https://syzkaller.appspot.com/x/log.txt?x=1204cc63600000
> kernel config:
> https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=e7d46eb426883fb97efd
> compiler: clang version 9.0.0 (/home/glider/llvm/clang
> 80fee25776c2fb61e74c1ecb1a523375c2500b69)
> syz repro:
> https://syzkaller.appspot.com/x/repro.syz?x=123c860d600000
> C reproducer:
> https://syzkaller.appspot.com/x/repro.c?x=110631b7600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the
> commit:
> Reported-by: syzbot+e7d46eb426883fb97efd@syzkaller.appspotmail.com
>
> =====================================================
> BUG: KMSAN: uninit-value in alauda_transport+0x462/0x57f0
> drivers/usb/storage/alauda.c:1137
> CPU: 0 PID: 12279 Comm: usb-storage Not tainted 5.3.0-rc7+ #0
> Hardware name: Google Google Compute Engine/Google Compute Engine,
> BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x191/0x1f0 lib/dump_stack.c:113
> kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108
> __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
> alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460
> alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
> usb_stor_invoke_transport+0xf5/0x27e0
> drivers/usb/storage/transport.c:606
> usb_stor_transparent_scsi_command+0x5d/0x70
> drivers/usb/storage/protocol.c:108
> usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380
> kthread+0x4b5/0x4f0 kernel/kthread.c:256
> ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
>
> Local variable description: ----status@alauda_check_media
> Variable was created at:
> alauda_check_media+0x8e/0x3310 drivers/usb/storage/alauda.c:454
> alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
> =====================================================
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 0 PID: 12279 Comm: usb-storage Tainted:
> G B 5.3.0-rc7+
> #0
> Hardware name: Google Google Compute Engine/Google Compute Engine,
> BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x191/0x1f0 lib/dump_stack.c:113
> panic+0x3c9/0xc1e kernel/panic.c:219
> kmsan_report+0x2a2/0x2b0 mm/kmsan/kmsan_report.c:131
> __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
> alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460
> alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
> usb_stor_invoke_transport+0xf5/0x27e0
> drivers/usb/storage/transport.c:606
> usb_stor_transparent_scsi_command+0x5d/0x70
> drivers/usb/storage/protocol.c:108
> usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380
> kthread+0x4b5/0x4f0 kernel/kthread.c:256
> ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
#syz test: https://github.com/google/kmsan.git 1e76a3e5
diff --git a/drivers/usb/storage/alauda.c
b/drivers/usb/storage/alauda.c
index ddab2cd3d2e7..bb309b9ad65b 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -452,7 +452,7 @@ static int alauda_init_media(struct us_data *us)
static int alauda_check_media(struct us_data *us)
{
struct alauda_info *info = (struct alauda_info *) us->extra;
- unsigned char status[2];
+ unsigned char *status = us->iobuf;
int rc;
rc = alauda_get_media_status(us, status);
next prev parent reply other threads:[~2019-10-11 11:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 19:39 syzbot
2019-10-11 11:23 ` Jaskaran Singh [this message]
2019-10-11 11:51 ` Alexander Potapenko
2019-10-11 15:42 ` syzbot
2019-10-11 14:08 ` Alan Stern
2019-10-11 14:18 ` Andrey Konovalov
2019-10-11 14:53 ` Alan Stern
2019-10-11 15:06 ` Greg Kroah-Hartman
2019-10-14 12:56 ` Andrey Konovalov
2019-10-11 15:24 ` syzbot
2021-12-28 7:47 ` Christophe JAILLET
2021-12-28 7:47 ` syzbot
2021-12-28 22:49 ` Alan Stern
2021-12-29 9:16 ` Christophe JAILLET
2021-12-29 16:45 ` Alan Stern
2021-12-28 8:01 ` Christophe JAILLET
2021-12-28 11:10 ` [syzbot] " syzbot
2019-10-11 11:17 Jas K
[not found] <cca3b7b4-d9cf-a275-ec0a-c99720a94049@wanadoo.fr>
2021-12-28 7:52 ` syzbot
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