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: 23caaf19b1
("ALSA: usb-mixer: Add support for Audio Class v2.0")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -1476,9 +1476,9 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
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return -EINVAL;
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}
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csize = hdr->bControlSize;
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if (!csize) {
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if (csize <= 1) {
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usb_audio_dbg(state->chip,
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"unit %u: invalid bControlSize == 0\n",
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"unit %u: invalid bControlSize <= 1\n",
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unitid);
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return -EINVAL;
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}
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