linux-kernel - Re: KASAN: use-after-free Read in v4l2

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Message-ID: <20200124141058.GM1847@kadam>
Date:   Fri, 24 Jan 2020 17:10:58 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     syzbot <syzbot+75287f75e2fedd69d680@...kaller.appspotmail.com>,
        andreyknvl@...gle.com, bnvandana@...il.com,
        hverkuil-cisco@...all.nl, laurent.pinchart@...asonboard.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-usb@...r.kernel.org, mchehab@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in v4l2_release (3)

This would work but another approach would be to to allocate "usbvision"
with devm_kzalloc(&dev->dev,...  I believe that would postpone the free
enough to solve the use after free but I hadn't tested it yet.  But
other drivers do that so hopefully it works.

regards,
dan carpenter