ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0
authorTakashi Iwai <tiwai@suse.de>
Mon, 18 Jan 2016 13:12:40 +0000 (14:12 +0100)
committerTakashi Iwai <tiwai@suse.de>
Mon, 18 Jan 2016 13:40:07 +0000 (14:40 +0100)
When a TLV ioctl with numid zero is handled, the driver may spew a
kernel warning with a stack trace at each call.  The check was
intended obviously only for a kernel driver, but not for a user
interaction.  Let's fix it.

This was spotted by syzkaller fuzzer.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/core/control.c

index 196a6fe..a85d455 100644 (file)
@@ -1405,6 +1405,8 @@ static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
                return -EFAULT;
        if (tlv.length < sizeof(unsigned int) * 2)
                return -EINVAL;
+       if (!tlv.numid)
+               return -EINVAL;
        down_read(&card->controls_rwsem);
        kctl = snd_ctl_find_numid(card, tlv.numid);
        if (kctl == NULL) {