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ALSA: mixart: Add sanity check for timer notify streams
author
Takashi Iwai
<tiwai@suse.de>
Tue, 7 Dec 2021 15:33:23 +0000
(16:33 +0100)
committer
Takashi Iwai
<tiwai@suse.de>
Tue, 7 Dec 2021 15:35:58 +0000
(16:35 +0100)
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>
sound/pci/mixart/mixart_core.c
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diff --git
a/sound/pci/mixart/mixart_core.c
b/sound/pci/mixart/mixart_core.c
index
853083d
..
a047ed0
100644
(file)
--- a/
sound/pci/mixart/mixart_core.c
+++ b/
sound/pci/mixart/mixart_core.c
@@
-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;