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ALSA: usb-audio: Add validation of UAC2/UAC3 effect units 

Just add fixed struct size validations for UAC2 and UAC3 effect
units.  The descriptor has a variable-length array, so it should be
validated with a proper function later once when the unit is really
parsed and used by the driver (currently only referred partially for
the input terminal parsing).

Link: https://patch.msgid.link/20250821151751.12100-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2025-08-21 17:17:50 +02:00
parent 8ea3449574
commit 2aec0b6a6b
1 changed files with 7 additions and 2 deletions
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9
sound/usb/validate.c
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@ -266,7 +266,11 @@ static const struct usb_desc_validator audio_validators[] = {
FUNC(UAC_VERSION_2, UAC_MIXER_UNIT, validate_mixer_unit),
FUNC(UAC_VERSION_2, UAC_SELECTOR_UNIT, validate_selector_unit),
FUNC(UAC_VERSION_2, UAC_FEATURE_UNIT, validate_uac2_feature_unit),
/* UAC_VERSION_2, UAC2_EFFECT_UNIT: not implemented yet */
/* just a stop-gap, it should be a proper function for the array
* once if the unit is really parsed/used
*/
FIXED(UAC_VERSION_2, UAC2_EFFECT_UNIT,
struct uac2_effect_unit_descriptor),
FUNC(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2, validate_processing_unit),
FUNC(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2, validate_processing_unit),
FIXED(UAC_VERSION_2, UAC2_CLOCK_SOURCE,
@ -286,7 +290,8 @@ static const struct usb_desc_validator audio_validators[] = {
FUNC(UAC_VERSION_3, UAC3_MIXER_UNIT, validate_mixer_unit),
FUNC(UAC_VERSION_3, UAC3_SELECTOR_UNIT, validate_selector_unit),
FUNC(UAC_VERSION_3, UAC3_FEATURE_UNIT, validate_uac3_feature_unit),
/* UAC_VERSION_3, UAC3_EFFECT_UNIT: not implemented yet */
FIXED(UAC_VERSION_3, UAC3_EFFECT_UNIT,
struct uac2_effect_unit_descriptor), /* sharing the same struct */
FUNC(UAC_VERSION_3, UAC3_PROCESSING_UNIT, validate_processing_unit),
FUNC(UAC_VERSION_3, UAC3_EXTENSION_UNIT, validate_processing_unit),
FIXED(UAC_VERSION_3, UAC3_CLOCK_SOURCE,