This is a note to let you know that I've just added the patch titled
ALSA: usb-audio: fix invalid length check for RME and other UAC 2 devices
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-usb-audio-fix-invalid-length-check-for-rme-and-other-uac-2-devices.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d56268fb108c7c21e19933588ca4d94652585183 Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <[email protected]>
Date: Thu, 29 Nov 2012 17:04:23 +0100
Subject: ALSA: usb-audio: fix invalid length check for RME and other UAC 2
devices
From: Clemens Ladisch <[email protected]>
commit d56268fb108c7c21e19933588ca4d94652585183 upstream.
Commit 23caaf19b11e (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 <[email protected]>
Tested-by: Matthew Robbetts <[email protected]>
Tested-by: Michael Beer <[email protected]>
Cc: Daniel Mack <[email protected]>
Signed-off-by: Clemens Ladisch <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
sound/usb/mixer.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1259,16 +1259,23 @@ static int parse_audio_feature_unit(stru
}
channels = (hdr->bLength - 7) / csize - 1;
bmaControls = hdr->bmaControls;
+ if (hdr->bLength < 7 + csize) {
+ snd_printk(KERN_ERR "usbaudio: unit %u: "
+ "invalid UAC_FEATURE_UNIT descriptor\n",
+ unitid);
+ return -EINVAL;
+ }
} else {
struct uac2_feature_unit_descriptor *ftr = _ftr;
csize = 4;
channels = (hdr->bLength - 6) / 4 - 1;
bmaControls = ftr->bmaControls;
- }
-
- if (hdr->bLength < 7 || !csize || hdr->bLength < 7 + csize) {
- snd_printk(KERN_ERR "usbaudio: unit %u: invalid
UAC_FEATURE_UNIT descriptor\n", unitid);
- return -EINVAL;
+ if (hdr->bLength < 6 + csize) {
+ snd_printk(KERN_ERR "usbaudio: unit %u: "
+ "invalid UAC_FEATURE_UNIT descriptor\n",
+ unitid);
+ return -EINVAL;
+ }
}
/* parse the source unit */
Patches currently in stable-queue which might be from [email protected] are
queue-3.7/alsa-usb-audio-fix-invalid-length-check-for-rme-and-other-uac-2-devices.patch
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