linux-kernel - [025/103] mmc: sdhci-s3c: fix NULL ptr access in sdhci_s3c

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Message-Id: <20101022185229.576253286@clark.site>
Date:	Fri, 22 Oct 2010 11:50:59 -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,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Chris Ball <cjb@...top.org>
Subject: [025/103] mmc: sdhci-s3c: fix NULL ptr access in sdhci_s3c_remove

2.6.35-stable review patch.  If anyone has any objections, please let us know.

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

From: Marek Szyprowski <m.szyprowski@...sung.com>

commit 9320f7cbbdd5febf013b0e91db29189724057738 upstream.

If not all clocks have been defined in platform data, the driver will
cause a null pointer dereference when it is removed. This patch fixes
this issue.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/mmc/host/sdhci-s3c.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -372,8 +372,10 @@ static int __devexit sdhci_s3c_remove(st
 	sdhci_remove_host(host, 1);
 
 	for (ptr = 0; ptr < 3; ptr++) {
-		clk_disable(sc->clk_bus[ptr]);
-		clk_put(sc->clk_bus[ptr]);
+		if (sc->clk_bus[ptr]) {
+			clk_disable(sc->clk_bus[ptr]);
+			clk_put(sc->clk_bus[ptr]);
+		}
 	}
 	clk_disable(sc->clk_io);
 	clk_put(sc->clk_io);


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