[alsa-devel] [PATCH] ASoC: soc-cache: Fix memory overflow in LZO initialization

[Liam Girdwood]

On Mon, 2010-11-29 at 11:43 +0000, Dimitris Papastamos wrote:
> The bitmap_zero() nbits argument was improperly set to reg_size
> but the underlying buffer was bmp_size long.  This caused the memset
> to zero past the end of the allocated buffer and into the kernel heap
> causing strange kernel crashes sometimes by overwriting critical
> kernel structures.
> 
> Signed-off-by: Dimitris Papastamos <dp at opensource.wolfsonmicro.com>
> ---
>  sound/soc/soc-cache.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
> index 9b1ba33..5143984 100644
> --- a/sound/soc/soc-cache.c
> +++ b/sound/soc/soc-cache.c
> @@ -1348,7 +1348,7 @@ static int snd_soc_lzo_cache_init(struct snd_soc_codec *codec)
>  		ret = -ENOMEM;
>  		goto err;
>  	}
> -	bitmap_zero(sync_bmp, reg_size);
> +	bitmap_zero(sync_bmp, bmp_size);
>  
>  	/* allocate the lzo blocks and initialize them */
>  	for (i = 0; i < blkcount; ++i) {

Acked-by: Liam Girdwood <lrg at slimlogic.co.uk>
-- 
Freelance Developer, SlimLogic Ltd
ASoC and Voltage Regulator Maintainer.
http://www.slimlogic.co.uk