linux-kernel - [031/143] mmc: sdhci: Check mrq != NULL in sdhci_tasklet

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Message-Id: <20110506002208.192222656@clark.kroah.org>
Date:	Thu, 05 May 2011 17:20:16 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Chris Ball <cjb@...top.org>
Subject: [031/143] mmc: sdhci: Check mrq != NULL in sdhci_tasklet_finish

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

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

From: Chris Ball <cjb@...top.org>

commit 0c9c99a765321104cc5f9c97f949382a9ba4927e upstream.

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

Seen on S3C6410 system.  Based on a patch by Dimitris Papastamos.

Reported-by: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/mmc/host/sdhci.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1266,6 +1266,13 @@ static void sdhci_tasklet_finish(unsigne
 
 	host = (struct sdhci_host*)param;
 
+        /*
+         * If this tasklet gets rescheduled while running, it will
+         * be run again afterwards but without any active request.
+         */
+	if (!host->mrq)
+		return;
+
 	spin_lock_irqsave(&host->lock, flags);
 
 	del_timer(&host->timer);


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