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Date: Mon, 01 Nov 2010 10:39:14 +0100 From: Takashi Iwai <tiwai@...e.de> To: Jesper Juhl <jj@...osbits.net> Cc: linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz> Subject: Re: [PATCH] USB PCM Sound driver neglects kmalloc return value check and may deref NULL. At Fri, 29 Oct 2010 20:40:23 +0200 (CEST), Jesper Juhl wrote: > > > 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@...osbits.net> Applied now. Thanks! Takashi > --- > 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@...osbits.net> http://www.chaosbits.net/ > Plain text mails only, please http://www.expita.com/nomime.html > Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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