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ALSA: usb-audio: Fix incorrect size check for processing/extension units

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The recently introduced unit descriptor validation had some bug for
processing and extension units, it counts a bControlSize byte twice so
it expected a bigger size than it should have been.  This seems
resulting in a probe error on a few devices.

Fix the calculation for proper checks of PU and EU.

Fixes: 57f8770620 ("ALSA: usb-audio: More validations of descriptor units")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191114165613.7422-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-11-14 17:56:12 +01:00
parent cc9dbfa970
commit 976a68f06b
1 changed files with 3 additions and 3 deletions
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6
sound/usb/validate.c
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@ -81,9 +81,9 @@ static bool validate_processing_unit(const void *p,
switch (v->protocol) {
case UAC_VERSION_1:
default:
/* bNrChannels, wChannelConfig, iChannelNames, bControlSize */
len += 1 + 2 + 1 + 1;
if (d->bLength < len) /* bControlSize */
/* bNrChannels, wChannelConfig, iChannelNames */
len += 1 + 2 + 1;
if (d->bLength < len + 1) /* bControlSize */
return false;
m = hdr[len];
len += 1 + m + 1; /* bControlSize, bmControls, iProcessing */