diff options
| author | Jun Seo <jun.seo.93@proton.me> | 2026-02-26 10:08:20 +0900 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-12 07:09:32 -0400 |
| commit | 499ffd15b00dc91ac95c28f76959dfb5cdcc84d5 (patch) | |
| tree | 20136aefab60581b09d27df2ce28071d5bb04680 /sound | |
| parent | b0126b522e52d34be010dac327a845f2aa6d5fd5 (diff) | |
ALSA: usb-audio: Use correct version for UAC3 header validation
commit 54f9d645a5453d0bfece0c465d34aaf072ea99fa upstream.
The entry of the validators table for UAC3 AC header descriptor is
defined with the wrong protocol version UAC_VERSION_2, while it should
have been UAC_VERSION_3. This results in the validator never matching
for actual UAC3 devices (protocol == UAC_VERSION_3), causing their
header descriptors to bypass validation entirely. A malicious USB
device presenting a truncated UAC3 header could exploit this to cause
out-of-bounds reads when the driver later accesses unvalidated
descriptor fields.
The bug was introduced in the same commit as the recently fixed UAC3
feature unit sub-type typo, and appears to be from the same copy-paste
error when the UAC3 section was created from the UAC2 section.
Fixes: 57f8770620e9 ("ALSA: usb-audio: More validations of descriptor units")
Cc: <stable@vger.kernel.org>
Signed-off-by: Jun Seo <jun.seo.93@proton.me>
Link: https://patch.msgid.link/20260226010820.36529-1-jun.seo.93@proton.me
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/validate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/usb/validate.c b/sound/usb/validate.c index 4bb4893f6e74..f62b7cc041dc 100644 --- a/sound/usb/validate.c +++ b/sound/usb/validate.c @@ -281,7 +281,7 @@ static const struct usb_desc_validator audio_validators[] = { /* UAC_VERSION_2, UAC2_SAMPLE_RATE_CONVERTER: not implemented yet */ /* UAC3 */ - FIXED(UAC_VERSION_2, UAC_HEADER, struct uac3_ac_header_descriptor), + FIXED(UAC_VERSION_3, UAC_HEADER, struct uac3_ac_header_descriptor), FIXED(UAC_VERSION_3, UAC_INPUT_TERMINAL, struct uac3_input_terminal_descriptor), FIXED(UAC_VERSION_3, UAC_OUTPUT_TERMINAL, |