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authorTakashi Iwai <tiwai@suse.de>2017-11-21 17:07:43 +0100
committerTakashi Iwai <tiwai@suse.de>2017-11-21 17:50:32 +0100
commit8428a8ebde2db1e988e41a58497a28beb7ce1705 (patch)
tree5bd2f5a3c9d60d7f8166c170a8f2649cb5201ff7 /sound/usb
parentf658f17b5e0e339935dca23e77e0f3cad591926b (diff)
ALSA: usb-audio: Fix potential zero-division at parsing FU
parse_audio_feature_unit() contains a code dividing potentially with zero when a malformed FU descriptor is passed. Although there is already a sanity check, it checks only the value zero, hence it can still lead to a zero-division when a value 1 is passed there. Fix it by correcting the sanity check (and the error message thereof). Fixes: 23caaf19b11e ("ALSA: usb-mixer: Add support for Audio Class v2.0") Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/mixer.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 61b348383de8..0537c6322990 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1476,9 +1476,9 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
return -EINVAL;
}
csize = hdr->bControlSize;
- if (!csize) {
+ if (csize <= 1) {
usb_audio_dbg(state->chip,
- "unit %u: invalid bControlSize == 0\n",
+ "unit %u: invalid bControlSize <= 1\n",
unitid);
return -EINVAL;
}