linux-kernel - drivers/gpu/drm/radeon/r100.c: check for invalid family

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Date:	Fri, 25 Dec 2009 00:21:36 +1100
From:	Darren Jenkins <darrenrjenkins@...il.com>
To:	David Airlie <airlied@...ux.ie>,
	dri-devel mailing list <dri-devel@...ts.sourceforge.net>,
	Kernel Janitors <kernel-janitors@...r.kernel.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: drivers/gpu/drm/radeon/r100.c: check for invalid family

If there is an invalid family the fw_name is NULL and causes an
NULL pointer dereference.
This just adds a check for something unexpected.

Coverity CID: 13251

Signed-off-by: Darren Jenkins <darrenrjenkins@...il.com>
diff --git a/drivers/gpu/drm/radeon/r100.c
b/drivers/gpu/drm/radeon/r100.c
index 84e5df7..7d5de31 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -584,6 +584,8 @@ static int r100_cp_init_microcode(struct
radeon_device *rdev)
 		   (rdev->family == CHIP_RV570)) {
 		DRM_INFO("Loading R500 Microcode\n");
 		fw_name = FIRMWARE_R520;
+	} else {
+		return -EINVAL;
 	}
 
 	err = request_firmware(&rdev->me_fw, fw_name, &pdev->dev);


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