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List: kernel-janitors
Subject: Re: [patch] ALSA: compress: info leak in snd_compr_get_caps()
From: Vinod Koul <vinod.koul () intel ! com>
Date: 2013-04-22 8:50:41
Message-ID: 20130422083841.GI6081 () intel ! com
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On Mon, Apr 22, 2013 at 10:42:25AM +0200, Takashi Iwai wrote:
> At Sun, 21 Apr 2013 14:07:29 +0300,
> Dan Carpenter wrote:
> >
> > If the ->get_caps() function doesn't clear the buffer then there would
> > stack information leaked to userspace. For example,
> > soc_compr_get_caps() can return success without clearing the buffer.
>
> Thanks, applied now.
>
> I found that we have also a similar problem in other ioctls
> (snd_compr_get_codec_caps() and snd_compr_get_params()), so applied
> the following patch in addition.
>
>
> Takashi
>
> ---
> From: Takashi Iwai <tiwai@suse.de>
> Subject: [PATCH] ALSA: compress: Use kzalloc() for ioctls writing back data
>
> Like the previous patch by Dan, we should clear the data to be
> returned from certain compress ioctls, namely,
> snd_compr_get_codec_caps() and snd_compr_get_params().
> This time, we can simply replace kmalloc() with kzalloc().
>
> Signed-off-by: Takashi Iwai <tiwai@suse.de>
If not too late..
Both Acked-by: Vinod Koul <vinod.koul@intel.com>
> ---
> sound/core/compress_offload.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
> index 664c693..a0bc47f 100644
> --- a/sound/core/compress_offload.c
> +++ b/sound/core/compress_offload.c
> @@ -428,7 +428,7 @@ snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
> if (!stream->ops->get_codec_caps)
> return -ENXIO;
>
> - caps = kmalloc(sizeof(*caps), GFP_KERNEL);
> + caps = kzalloc(sizeof(*caps), GFP_KERNEL);
> if (!caps)
> return -ENOMEM;
>
> @@ -545,7 +545,7 @@ snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
> if (!stream->ops->get_params)
> return -EBADFD;
>
> - params = kmalloc(sizeof(*params), GFP_KERNEL);
> + params = kzalloc(sizeof(*params), GFP_KERNEL);
> if (!params)
> return -ENOMEM;
> retval = stream->ops->get_params(stream, params);
> --
> 1.8.2.1
>
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