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ALSA: timer: Fix race at concurrent reads
authorTakashi Iwai <tiwai@suse.de>
Mon, 8 Feb 2016 16:26:58 +0000 (17:26 +0100)
committerTakashi Iwai <tiwai@suse.de>
Tue, 9 Feb 2016 11:23:42 +0000 (12:23 +0100)
commit4dff5c7b7093b19c19d3a100f8a3ad87cb7cd9e7
treef2b107d1d85650e5a9efb06f1f13da19e8644648tree | snapshot
parented8b1d6d2c741ab26d60d499d7fbb7ac801f0f51commit | diff
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>
sound/core/timer.c diff | blob | history
Linux kernel for KaRo TX COM modules