linux-kernel - [PATCH] drm/radeon/radeon_fence.c: move a dereference below the NULL test

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Message-ID: <1262136005.8733.26.camel@ICE-BOX>
Date:	Wed, 30 Dec 2009 12:20:05 +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: [PATCH] drm/radeon/radeon_fence.c: move a dereference below the
 NULL test

If a NULL value is possible, the dereference should only occur after the
NULL test.

Coverity CID: 13334

Signed-off-by: Darren Jenkins <darrenrjenkins@...il.com>

diff --git drivers/gpu/drm/radeon/radeon_fence.c drivers/gpu/drm/radeon/radeon_fence.c
index 4cdd8b4..f3a8380 100644
--- drivers/gpu/drm/radeon/radeon_fence.c
+++ drivers/gpu/drm/radeon/radeon_fence.c
@@ -140,14 +140,14 @@ int radeon_fence_create(struct radeon_device *rdev, struct radeon_fence **fence)
 
 bool radeon_fence_signaled(struct radeon_fence *fence)
 {
-	struct radeon_device *rdev = fence->rdev;
 	unsigned long irq_flags;
 	bool signaled = false;
 
-	if (rdev->gpu_lockup) {
+	if (fence == NULL) {
 		return true;
 	}
-	if (fence == NULL) {
+
+	if (fence->rdev->gpu_lockup) {
 		return true;
 	}
 	write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags);


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