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ALSA: mixart: Add sanity check for timer notify streams

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The miXart timer notification is a variable length, and if a hardware
is screwed up, we may access over the actual data size.  Let's add a
sanity check and bail out if an invalid value is received.

Link: https://lore.kernel.org/r/20211207153323.27098-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-12-07 16:33:23 +01:00
parent a98478f825
commit 403c521003
1 changed files with 2 additions and 0 deletions
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2
sound/pci/mixart/mixart_core.c
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@ -443,6 +443,8 @@ irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
notify = (struct mixart_timer_notify *)mixart_msg_data;
BUILD_BUG_ON(sizeof(notify) > sizeof(mixart_msg_data));
if (snd_BUG_ON(notify->stream_count > ARRAY_SIZE(notify->streams)))
break;
for(i=0; i<notify->stream_count; i++) {
u32 buffer_id = notify->streams[i].buffer_id;