BACKPORT: 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.
Bug: 37240993
Change-Id: I7358a57638ef23eb7f97341eaee1f0dd4ba2795a
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Siqi Lin <siqilin@google.com>
(cherry picked from commit 4dff5c7b7093b19c19d3a100f8a3ad87cb7cd9e7)
CVE-2017-13167
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
1 file changed