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| author | Jesper Juhl <jj@chaosbits.net> | 2010-10-29 20:40:23 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2010-11-01 10:23:39 +0100 |
| commit | 8a8d56b2a2f9aa423c3d8b6b1e2792c0492059ed (patch) | |
| tree | 03fa96d09560dcc68a059318a4100157d37da806 /sound/usb/pcm.c | |
| parent | 89e1e66d6be8a520cdcd26043cda2cc870a34015 (diff) | |
| download | lwn-8a8d56b2a2f9aa423c3d8b6b1e2792c0492059ed.tar.gz lwn-8a8d56b2a2f9aa423c3d8b6b1e2792c0492059ed.zip | |
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>
Diffstat (limited to 'sound/usb/pcm.c')
| -rw-r--r-- | sound/usb/pcm.c | 4 |
1 files changed, 3 insertions, 1 deletions
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) { |