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Revert "ALSA: usb-audio: Fix potential zero-division at parsing FU"

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The commit 8428a8ebde ("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 <[email protected]>
Fixes: 8428a8ebde ("ALSA: usb-audio: Fix potential zero-division at parsing FU"
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Takashi Iwai 2017-11-27 10:59:40 +01:00 • committed by Linus Torvalds
commit 3c02a6d946
1 changed files with 2 additions and 2 deletions
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4
sound/usb/mixer.c
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@ -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;
}