ALSA: usb-audio: fix invalid length check for RME and other UAC 2 devices
Commit 23caaf19b1
(ALSA: usb-mixer: Add support for Audio Class v2.0)
forgot to adjust the length check for UAC 2.0 feature unit descriptors.
This would make the code abort on encountering a feature unit without
per-channel controls, and thus prevented the driver to work with any
device having such a unit, such as the RME Babyface or Fireface UCX.
Reported-by: Florian Hanisch <fhanisch@uni-potsdam.de>
Tested-by: Matthew Robbetts <wingfeathera@gmail.com>
Tested-by: Michael Beer <beerml@sigma6audio.de>
Cc: Daniel Mack <daniel@caiaq.de>
Cc: 2.6.35+ <stable@vger.kernel.org>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
parent
257c2a02a8
commit
d56268fb10
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@ -1331,16 +1331,23 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
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}
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}
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channels = (hdr->bLength - 7) / csize - 1;
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channels = (hdr->bLength - 7) / csize - 1;
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bmaControls = hdr->bmaControls;
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bmaControls = hdr->bmaControls;
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if (hdr->bLength < 7 + csize) {
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snd_printk(KERN_ERR "usbaudio: unit %u: "
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"invalid UAC_FEATURE_UNIT descriptor\n",
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unitid);
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return -EINVAL;
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}
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} else {
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} else {
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struct uac2_feature_unit_descriptor *ftr = _ftr;
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struct uac2_feature_unit_descriptor *ftr = _ftr;
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csize = 4;
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csize = 4;
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channels = (hdr->bLength - 6) / 4 - 1;
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channels = (hdr->bLength - 6) / 4 - 1;
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bmaControls = ftr->bmaControls;
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bmaControls = ftr->bmaControls;
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}
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if (hdr->bLength < 6 + csize) {
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snd_printk(KERN_ERR "usbaudio: unit %u: "
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if (hdr->bLength < 7 || !csize || hdr->bLength < 7 + csize) {
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"invalid UAC_FEATURE_UNIT descriptor\n",
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snd_printk(KERN_ERR "usbaudio: unit %u: invalid UAC_FEATURE_UNIT descriptor\n", unitid);
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unitid);
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return -EINVAL;
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return -EINVAL;
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}
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}
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}
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/* parse the source unit */
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/* parse the source unit */
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