From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 18 Jan 2016 13:12:40 +0000 (+0100)
Subject: ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0
X-Git-Tag: v3.2.77~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c793373eea1dcd0102a4f09edea14d404da9629b;p=pandora-kernel.git

ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0

commit c0bcdbdff3ff73a54161fca3cb8b6cdbd0bb8762 upstream.

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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