From: Zheyu Ma <zheyuma97@gmail.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-media <linux-media@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [BUG] media: cx88-alsa: Found a bug at the probe time
Date: Fri, 15 Jul 2022 09:54:28 +0800 [thread overview]
Message-ID: <CAMhUBj=bs8rbiPGX1qOv9FSU8m=TdRZqqJGvRcynKbaWwf_A-A@mail.gmail.com> (raw)
Hello,
I found a bug in the driver cx88-alsa.
When the driver fails in the function snd_cx88_create() at the probe
time, it will cause a UAF bug as follows:
[ 24.343899] Trying to free already-free IRQ 0
[ 24.344815] WARNING: CPU: 7 PID: 389 at kernel/irq/manage.c:1895
free_irq+0x3a4/0x7c0
[ 24.348448] RIP: 0010:free_irq+0x3a4/0x7c0
[ 24.356716] Call Trace:
[ 24.357124] snd_cx88_dev_free+0x71/0x100 [cx88_alsa]
[ 24.358008] release_card_device+0x7d/0x190
[ 24.358699] device_release+0x97/0x1c0
[ 24.359022] kobject_put+0x144/0x1c0
[ 24.359329] snd_card_free+0xec/0x150
[ 24.360078] cx88_audio_initdev+0x8f4/0xce0 [cx88_alsa]
Since I'm not familiar with the driver, could you please give me some
hints to fix it?
regards,
Zheyu Ma
next reply other threads:[~2022-07-15 1:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-15 1:54 Zheyu Ma [this message]
2022-07-16 19:03 ` [BUG] media: cx88-alsa: Found a bug at the probe time Randy Dunlap
2022-07-17 0:05 ` Zheyu Ma
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