From 60c961a9e1ed879a4d151df6076bf1203f595f73 Mon Sep 17 00:00:00 2001 From: Nicolai Krakowiak Date: Thu, 4 Aug 2011 15:56:27 +0200 Subject: ALSA: snd-usb: avoid dividing by zero on invalid input Signed-off-by: Nicolai Krakowiak Acked-by: Daniel Mack Acked-by: Clemens Ladisch Cc: stable@kernel.org Signed-off-by: Takashi Iwai --- sound/usb/mixer.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'sound') diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index c22fa76e363a..ee9aa087d8b5 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1191,6 +1191,11 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void if (state->mixer->protocol == UAC_VERSION_1) { csize = hdr->bControlSize; + if (!csize) { + snd_printdd(KERN_ERR "usbaudio: unit %u: " + "invalid bControlSize == 0\n", unitid); + return -EINVAL; + } channels = (hdr->bLength - 7) / csize - 1; bmaControls = hdr->bmaControls; } else { -- cgit v1.2.3