linux-kernel - [ 81/91] mmc: cd-gpio: protect against NULL context in mmc_cd_gpio

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Message-Id: <20120527002524.415389951@linuxfoundation.org>
Date:	Sun, 27 May 2012 09:26:27 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Chris Ball <cjb@...top.org>
Subject: [ 81/91] mmc: cd-gpio: protect against NULL context in mmc_cd_gpio_free()

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

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

From: Guennadi Liakhovetski <g.liakhovetski@....de>

commit 0e9f480bb553d39ee06ccd45639ba7a5446a7b81 upstream.

Do not oops, even if mmc_cd_gpio_free() is mistakenly called on a driver
cleanup path, even though a previous call to mmc_cd_gpio_request() failed.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
[stable@: please apply to 3.3-stable]
Signed-off-by: Chris Ball <cjb@...top.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/core/cd-gpio.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/mmc/core/cd-gpio.c
+++ b/drivers/mmc/core/cd-gpio.c
@@ -73,6 +73,9 @@ void mmc_cd_gpio_free(struct mmc_host *h
 {
 	struct mmc_cd_gpio *cd = host->hotplug.handler_priv;
 
+	if (!cd)
+		return;
+
 	free_irq(host->hotplug.irq, host);
 	gpio_free(cd->gpio);
 	kfree(cd);


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