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ASoC: soc-cache: Fix memory overflow in LZO initialization

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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@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Dimitris Papastamos 2010-11-29 11:43:33 +00:00 committed by Mark Brown
parent dfa7c70b04
commit 09c74a9d0b
1 changed files with 1 additions and 1 deletions
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2
sound/soc/soc-cache.c
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@ -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) {