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authorTakashi Iwai <tiwai@suse.de>2019-11-14 17:56:12 +0100
committerTakashi Iwai <tiwai@suse.de>2019-11-14 18:01:22 +0100
commit976a68f06b2ea49e2ab67a5f84919a8b105db8be (patch)
tree7a44d7b68c7f9a246b516bc99e0d0342220c973d /sound/usb
parentcc9dbfa9707868fb0ca864c05e0c42d3f4d15cf2 (diff)
ALSA: usb-audio: Fix incorrect size check for processing/extension units
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: 57f8770620e9 ("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>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/validate.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/sound/usb/validate.c b/sound/usb/validate.c
index a5e584b60dcd..389e8657434a 100644
--- a/sound/usb/validate.c
+++ b/sound/usb/validate.c
@@ -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 */