linux-kernel - [PATCH 3.12 085/212] mmc: atmel-mci: fix oops in atmci_tasklet

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Message-Id: <20131202191257.136891310@linuxfoundation.org>
Date:	Mon,  2 Dec 2013 11:14:36 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Rodolfo Giometti <giometti@...eenne.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Chris Ball <cjb@...top.org>
Subject: [PATCH 3.12 085/212] mmc: atmel-mci: fix oops in atmci_tasklet_func

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rodolfo Giometti <giometti@...eenne.com>

commit fbd986cd420d1deeabf1039ec4e74075a5639db5 upstream.

In some cases, a NULL pointer dereference happens because data is NULL when
STATE_END_REQUEST case is reached in atmci_tasklet_func.

Signed-off-by: Rodolfo Giometti <giometti@...eenne.com>
Acked-by: Ludovic Desroches <ludovic.desroches@...el.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/atmel-mci.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1810,12 +1810,14 @@ static void atmci_tasklet_func(unsigned
 			if (unlikely(status)) {
 				host->stop_transfer(host);
 				host->data = NULL;
-				if (status & ATMCI_DTOE) {
-					data->error = -ETIMEDOUT;
-				} else if (status & ATMCI_DCRCE) {
-					data->error = -EILSEQ;
-				} else {
-					data->error = -EIO;
+				if (data) {
+					if (status & ATMCI_DTOE) {
+						data->error = -ETIMEDOUT;
+					} else if (status & ATMCI_DCRCE) {
+						data->error = -EILSEQ;
+					} else {
+						data->error = -EIO;
+					}
 				}
 			}
 


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