linux-kernel - [PATCH] [22/98] mmc: sdhci: Check mrq->cmd in sdhci_tasklet

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Date:	Tue, 26 Jul 2011 17:35:14 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	ben-linux@...ff.org, broonie@...nsource.wolfsonmicro.com,
	cjb@...top.org, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] [22/98] mmc: sdhci: Check mrq->cmd in sdhci_tasklet_finish

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Ben Dooks <ben-linux@...ff.org>

commit b7b4d3426d2b5ecab21578eb20d8e456a1aace8f upstream.

It seems that under certain circumstances that the sdhci_tasklet_finish()
call can be entered with mrq->cmd set to NULL, causing the system to crash
with a NULL pointer de-reference.

Unable to handle kernel NULL pointer dereference at virtual address 00000000
PC is at sdhci_tasklet_finish+0x34/0xe8
LR is at sdhci_tasklet_finish+0x24/0xe8

Seen on S3C6410 system.

Signed-off-by: Ben Dooks <ben-linux@...ff.org>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/mmc/host/sdhci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/drivers/mmc/host/sdhci.c
===================================================================
--- linux-2.6.35.y.orig/drivers/mmc/host/sdhci.c
+++ linux-2.6.35.y/drivers/mmc/host/sdhci.c
@@ -1289,7 +1289,7 @@ static void sdhci_tasklet_finish(unsigne
 	 * upon error conditions.
 	 */
 	if (!(host->flags & SDHCI_DEVICE_DEAD) &&
-		(mrq->cmd->error ||
+	    ((mrq->cmd && mrq->cmd->error) ||
 		 (mrq->data && (mrq->data->error ||
 		  (mrq->data->stop && mrq->data->stop->error))) ||
 		   (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
--
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