Takashi Iwai 4dff5c7b70 ALSA: timer: Fix race at concurrent reads ...

snd_timer_user_read() has a potential race among parallel reads, as
qhead and qused are updated outside the critical section due to
copy_to_user() calls.  Move them into the critical section, and also
sanitize the relevant code a bit.

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2016-02-09 12:23:42 +01:00

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