original_kernel/sound/core
Takashi Iwai 4e7655fd4f ALSA: seq: Don't break snd_use_lock_sync() loop by timeout
The snd_use_lock_sync() (thus its implementation
snd_use_lock_sync_helper()) has the 5 seconds timeout to break out of
the sync loop.  It was introduced from the beginning, just to be
"safer", in terms of avoiding the stupid bugs.

However, as Ben Hutchings suggested, this timeout rather introduces a
potential leak or use-after-free that was apparently fixed by the
commit 2d7d54002e ("ALSA: seq: Fix race during FIFO resize"):
for example, snd_seq_fifo_event_in() -> snd_seq_event_dup() ->
copy_from_user() could block for a long time, and snd_use_lock_sync()
goes timeout and still leaves the cell at releasing the pool.

For fixing such a problem, we remove the break by the timeout while
still keeping the warning.

Suggested-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-04-13 14:13:25 +02:00
..
oss sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
seq ALSA: seq: Don't break snd_use_lock_sync() loop by timeout 2017-04-13 14:13:25 +02:00
Kconfig
Makefile
compress_offload.c ALSA: compress: fix some missing and misplaced \n in messages 2016-09-16 19:24:13 +02:00
control.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
control_compat.c
ctljack.c
device.c
hrtimer.c ktime: Get rid of the union 2016-12-25 17:21:22 +01:00
hwdep.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
hwdep_compat.c
info.c ALSA: info: Return error for invalid read/write 2016-11-08 14:37:26 +01:00
info_oss.c
init.c
isadma.c
jack.c
memalloc.c
memory.c
misc.c printk/sound: handle more message headers 2016-12-12 18:55:09 -08:00
pcm.c ALSA: pcm: Free chmap at PCM free callback, too 2016-07-08 09:15:44 +02:00
pcm_compat.c
pcm_dmaengine.c
pcm_drm_eld.c
pcm_iec958.c
pcm_lib.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
pcm_memory.c
pcm_misc.c
pcm_native.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
pcm_timer.c
pcm_trace.h
rawmidi.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
rawmidi_compat.c
sgbuf.c
sound.c
sound_oss.c
timer.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
timer_compat.c
vmaster.c