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DateFri, 29 Oct 2010 20:40:23 +0200 (CEST)
FromJesper Juhl <>
Subject[PATCH] USB PCM Sound driver neglects kmalloc return value check and may deref NULL.

sound/usb/pcm.c::snd_usb_pcm_check_knot() fails to check the return value
from kmalloc() and may end up dereferencing a null pointer.
The patch below (compile tested only) should take care of that little
problem.


Signed-off-by: Jesper Juhl <jj@chaosbits.net>
---
pcm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index cff3a3c..4132522 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -676,8 +676,10 @@ static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
if (!needs_knot)
return 0;

- subs->rate_list.count = count;
subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
+ if (!subs->rate_list.list)
+ return -ENOMEM;
+ subs->rate_list.count = count;
subs->rate_list.mask = 0;
count = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {

--
Jesper Juhl <jj@chaosbits.net> http://www.chaosbits.net/
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