From 3c02a6d946657e1ae0688e0d89f2dd2cfe9afba8 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 27 Nov 2017 10:59:40 +0100
Subject: [PATCH] Revert "ALSA: usb-audio: Fix potential zero-division at parsing FU"
Mime-version: 1.0
Content-type: text/plain; charset=UTF-8
Content-transfer-encoding: 8bit
Git-commit: 3c02a6d946657e1ae0688e0d89f2dd2cfe9afba8
Patch-mainline: v4.15-rc2
References: bsc#1121278
The commit 8428a8ebde2d ("ALSA: usb-audio: Fix potential zero-division
at parsing FU") is utterly bogus and breaks the case with csize=1
instead of fixing anything. Just take it back again.
Reported-by: Jörg Otte <jrg.otte@gmail.com>
Fixes: 8428a8ebde2d ("ALSA: usb-audio: Fix potential zero-division at parsing FU"
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
sound/usb/mixer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 0537c6322990..61b348383de8 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 <= 1) {
+ if (!csize) {
usb_audio_dbg(state->chip,
- "unit %u: invalid bControlSize <= 1\n",
+ "unit %u: invalid bControlSize == 0\n",
unitid);
return -EINVAL;
}
--
2.20.1