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authorTakashi Iwai <tiwai@suse.de>2019-07-04 16:31:12 +0200
committerTakashi Iwai <tiwai@suse.de>2019-07-05 08:06:47 +0200
commitca95c7bf3d29716916baccdc77c3c2284b703069 (patch)
tree13a802819035ac0c628b6a8e41976ba6eed842b3 /Documentation
parent335399362a6edeec5a365ed0fbb0b6902cacc4e4 (diff)
downloadlinux-ca95c7bf3d29716916baccdc77c3c2284b703069.tar.bz2
ALSA: usb-audio: Fix parse of UAC2 Extension Units
Extension Unit (XU) is used to have a compatible layout with Processing Unit (PU) on UAC1, and the usb-audio driver code assumed it for parsing the descriptors. Meanwhile, on UAC2, XU became slightly incompatible with PU; namely, XU has a one-byte bmControls bitmap while PU has two bytes bmControls bitmap. This incompatibility results in the read of a wrong address for the last iExtension field, which ended up with an incorrect string for the mixer element name, as recently reported for Focusrite Scarlett 18i20 device. This patch corrects this misalignment by introducing a couple of new macros and calling them depending on the descriptor type. Fixes: 23caaf19b11e ("ALSA: usb-mixer: Add support for Audio Class v2.0") Reported-by: Stefan Sauer <ensonic@hora-obscura.de> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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