linux-kernel - [PATCH] Initialize pointer on request

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Date:	Wed, 21 Sep 2011 23:55:15 -0300
From:	"Lucas C. Villa Real" <lucasvr@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] Initialize pointer on request_firmware

Hello, folks,

I've seen some kernel oopses when suspending my machine. The problem comes from isight_firmware, which assumes that, on error, a call to request_firmware() will initialize the provided pointer to the firmware image to NULL.

The patch below fixes the isight_firmware side of the problem and also ensures that request_firmware() always sets the pointer to NULL on such cases (it currently does that for all except one situation).

Signed-off-by: Lucas C. Villa Real <lucasvr@...olinux.org>

--- linux-3.0.4/drivers/base/firmware_class.c.orig	2011-09-21 21:03:01.000000000 -0300
+++ linux-3.0.4/drivers/base/firmware_class.c	2011-09-21 21:03:13.000000000 -0300
@@ -523,6 +523,7 @@ static int _request_firmware(const struc

 	if (WARN_ON(usermodehelper_is_disabled())) {
 		dev_err(device, "firmware: %s will not be loaded\n", name);
+		*firmware_p = NULL;
 		return -EBUSY;
 	}

--- linux-3.0.4/drivers/usb/misc/isight_firmware.c.orig	2011-09-21 20:47:39.000000000 -0300
+++ linux-3.0.4/drivers/usb/misc/isight_firmware.c	2011-09-21 20:47:46.000000000 -0300
@@ -39,7 +39,7 @@ static int isight_firmware_load(struct u
 {
 	struct usb_device *dev = interface_to_usbdev(intf);
 	int llen, len, req, ret = 0;
-	const struct firmware *firmware;
+	const struct firmware *firmware = NULL;
 	unsigned char *buf = kmalloc(50, GFP_KERNEL);
 	unsigned char data[4];
 	const u8 *ptr;
--
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