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mmc: at91_mci: fix pointer errors

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Fixes two pointer errors, one which leads to memory overwrites if used
with large chunks of data.

Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Andrew Victor <avictor.za@gmail.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wolfgang Muees 2010-03-05 13:43:38 -08:00 committed by Linus Torvalds
parent dc2ed55280
commit 0b3520f2df
1 changed files with 5 additions and 3 deletions
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8
drivers/mmc/host/at91_mci.c
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@ -227,11 +227,13 @@ static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data
for (index = 0; index < (amount / 4); index++)
*dmabuf++ = swab32(sgbuffer[index]);
} else {
memcpy(dmabuf, sgbuffer, amount);
dmabuf += amount;
char *tmpv = (char *)dmabuf;
memcpy(tmpv, sgbuffer, amount);
tmpv += amount;
dmabuf = (unsigned *)tmpv;
}
kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
kunmap_atomic(((void *)sgbuffer) - sg->offset, KM_BIO_SRC_IRQ);
if (size == 0)
break;