tree 2f690edfbdb4d6511cd05d7332bb232895d9d842
parent c18ab0bac4c377b22e03f9cd4efafa1316b76552
author Takashi Iwai <tiwai@suse.de> 1357823198 +0100
committer Takashi Iwai <tiwai@suse.de> 1357899137 +0100

ALSA: usb-audio: Fix NULL dereference by access to non-existing substream

The commit [0d9741c0: ALSA: usb-audio: sync ep init fix for
audioformat mismatch] introduced the correction of parameters to be
set for sync EP.  But since the new code assumes that the sync EP is
always paired with the data EP of another direction, it triggers Oops
when a device only with a single direction is used.

This patch adds a proper check of sync EP type and the presence of the
paired substream for avoiding the crash.

Reported-and-tested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>