linux-kernel - [PATCH 1/7] mmc: at91

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Date:	Fri, 26 Feb 2010 19:39:29 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	akpm@...ux-foundation.org, linux-mmc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	wolfgang.mues@...rswald.de, avictor.za@...il.com
Subject: [PATCH 1/7] mmc: at91_mci: fix pointer errors

From: Wolfgang Muees <wolfgang.mues@...rswald.de>

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

Signed-off-by: Wolfgang Muees <wolfgang.mues@...rswald.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
---
 drivers/mmc/host/at91_mci.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 63924e0..6835104 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -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;
-- 
1.5.6.5

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