[PATCH] ALSA: timer: Set lower bound of start tick time

[Takashi Iwai <tiwai@suse.de>]

Currently ALSA timer doesn't have the lower limit of the start tick
time, and it allows a very small size, e.g. 1 tick with 1ns resolution
for hrtimer.  Such a situation may lead to an unexpected RCU stall,
where  the callback repeatedly queuing the expire update, as reported
by fuzzer.

This patch introduces a sanity check of the timer start tick time, so
that the system returns an error when a too small start size is set.
As of this patch, the lower limit is hard-coded to 100us, which is
small enough but can still work somehow.

Reported-by: syzbot+43120c2af6ca2938cc38@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/000000000000fa00a1061740ab6d@google.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/timer.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 4d2ee99c12a3..d104adc75a8b 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -544,6 +544,14 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
 			     SNDRV_TIMER_IFLG_START))
 		return -EBUSY;
 
+	/* check the actual time for the start tick;
+	 * bail out as error if it's way too low (< 100us)
+	 */
+	if (start) {
+		if ((u64)snd_timer_hw_resolution(timer) * ticks < 100000)
+			return -EINVAL;
+	}
+
 	if (start)
 		timeri->ticks = timeri->cticks = ticks;
 	else if (!timeri->cticks)
-- 
2.43.0