ALSA: timer: Fix race at concurrent reads

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commit 4dff5c7b70 upstream.

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.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Takashi Iwai 2016-02-08 17:26:58 +01:00 • committed by Greg Kroah-Hartman

parent ce60478a99

commit 925249d517

1 changed files with 15 additions and 19 deletions

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sound/core/timer.c

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