From 8a8d56b2a2f9aa423c3d8b6b1e2792c0492059ed Mon Sep 17 00:00:00 2001
From: Jesper Juhl <jj@chaosbits.net>
Date: Fri, 29 Oct 2010 20:40:23 +0200
Subject: [PATCH] ALSA: usb - 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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/usb/pcm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index cff3a3c465d7..4132522ac90f 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) {
--
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