diff options
| author | Takashi Iwai <tiwai@suse.de> | 2017-11-21 16:55:51 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-30 08:40:48 +0000 |
| commit | 7a0e3e553e0dfcabd7b5928f33352c0559afeb75 (patch) | |
| tree | c8b79097caeccda7b567c693d5391c2fd95542b5 /sound | |
| parent | 27180144e50dccd03979469c3d714cad4815aa04 (diff) | |
ALSA: usb-audio: Add sanity checks to FE parser
commit d937cd6790a2bef2d07b500487646bd794c039bb upstream.
When the usb-audio descriptor contains the malformed feature unit
description with a too short length, the driver may access
out-of-bounds. Add a sanity check of the header size at the beginning
of parse_audio_feature_unit().
Fixes: 23caaf19b11e ("ALSA: usb-mixer: Add support for Audio Class v2.0")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/usb/mixer.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 91bc8f18791e..9bc34cb8a3ba 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1469,6 +1469,12 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, __u8 *bmaControls; if (state->mixer->protocol == UAC_VERSION_1) { + if (hdr->bLength < 7) { + usb_audio_err(state->chip, + "unit %u: invalid UAC_FEATURE_UNIT descriptor\n", + unitid); + return -EINVAL; + } csize = hdr->bControlSize; if (!csize) { usb_audio_dbg(state->chip, @@ -1486,6 +1492,12 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, } } else { struct uac2_feature_unit_descriptor *ftr = _ftr; + if (hdr->bLength < 6) { + usb_audio_err(state->chip, + "unit %u: invalid UAC_FEATURE_UNIT descriptor\n", + unitid); + return -EINVAL; + } csize = 4; channels = (hdr->bLength - 6) / 4 - 1; bmaControls = ftr->bmaControls; |