From: Alan Stern <stern@rowland.harvard.edu>
To: syzbot <syzbot+7fa38a608b1075dfd634@syzkaller.appspotmail.com>
Cc: andreyknvl@google.com, <gregkh@linuxfoundation.org>,
<kai.heng.feng@canonical.com>, <linux-kernel@vger.kernel.org>,
<linux-usb@vger.kernel.org>, <mans@mansr.com>, <oneukum@suse.com>,
<syzkaller-bugs@googlegroups.com>
Subject: Re: general protection fault in usb_set_interface
Date: Tue, 17 Sep 2019 11:16:32 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1909171115310.1590-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <000000000000dcade20592b1edc7@google.com>
On Mon, 16 Sep 2019, syzbot wrote:
> Hello,
>
> syzbot has tested the proposed patch but the reproducer still triggered
> crash:
> general protection fault in vidioc_querycap
Same problem in a different part of the code.
Alan Stern
#syz test: https://github.com/google/kasan.git f0df5c1b
drivers/media/usb/usbvision/usbvision-video.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
Index: usb-devel/drivers/media/usb/usbvision/usbvision-video.c
===================================================================
--- usb-devel.orig/drivers/media/usb/usbvision/usbvision-video.c
+++ usb-devel/drivers/media/usb/usbvision/usbvision-video.c
@@ -453,6 +453,12 @@ static int vidioc_querycap(struct file *
{
struct usb_usbvision *usbvision = video_drvdata(file);
+ mutex_lock(&usbvision->v4l2_lock);
+ if (!usbvision->dev) {
+ mutex_unlock(&usbvision->v4l2_lock);
+ return -ENODEV;
+ }
+
strscpy(vc->driver, "USBVision", sizeof(vc->driver));
strscpy(vc->card,
usbvision_device_data[usbvision->dev_model].model_string,
@@ -464,6 +470,7 @@ static int vidioc_querycap(struct file *
vc->capabilities |= V4L2_CAP_RADIO;
if (usbvision->have_tuner)
vc->capabilities |= V4L2_CAP_TUNER;
+ mutex_unlock(&usbvision->v4l2_lock);
return 0;
}
@@ -1111,7 +1118,8 @@ static int usbvision_radio_close(struct
mutex_lock(&usbvision->v4l2_lock);
/* Set packet size to 0 */
usbvision->iface_alt = 0;
- usb_set_interface(usbvision->dev, usbvision->iface,
+ if (usbvision->dev)
+ usb_set_interface(usbvision->dev, usbvision->iface,
usbvision->iface_alt);
usbvision_audio_off(usbvision);
next prev parent reply other threads:[~2019-09-17 15:16 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-16 13:29 general protection fault in usb_set_interface syzbot
2019-09-16 20:51 ` Alan Stern
2019-09-16 21:03 ` syzbot
2019-09-17 15:16 ` Alan Stern [this message]
2019-09-17 15:28 ` syzbot
2019-09-17 15:53 ` Alan Stern
2019-09-17 16:06 ` syzbot
2019-09-17 17:36 ` Alan Stern
2019-09-17 18:08 ` Alan Stern
2019-09-17 18:15 ` syzbot
2019-09-17 18:31 ` Alan Stern
2019-09-17 18:43 ` syzbot
2019-09-18 18:57 ` Alan Stern
2019-09-19 15:19 ` Andrey Konovalov
2019-12-13 12:15 ` Andrey Konovalov
2019-12-13 12:16 ` syzbot
2019-12-13 12:19 ` Andrey Konovalov
2019-12-13 19:51 ` Alan Stern
2019-12-16 14:59 ` Andrey Konovalov
2019-12-16 15:05 ` Alan Stern
2019-12-16 15:24 ` Andrey Konovalov
2019-12-17 13:17 ` Dmitry Vyukov
[not found] <000000000000cc588d05937a1659@google.com>
2019-09-26 21:03 ` Alan Stern
2019-12-10 20:17 Re: KASAN: use-after-free Read in usbvision_v4l2_open Alan Stern
2019-12-12 16:52 ` general protection fault in usb_set_interface Alan Stern
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Pine.LNX.4.44L0.1909171115310.1590-100000@iolanthe.rowland.org \
--to=stern@rowland.harvard.edu \
--cc=andreyknvl@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=kai.heng.feng@canonical.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=mans@mansr.com \
--cc=oneukum@suse.com \
--cc=syzbot+7fa38a608b1075dfd634@syzkaller.appspotmail.com \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.