linux-kernel - drivers/gpu/drm/radeon: move a dereference below a NULL test

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Message-ID: <1261658670.3546.7.camel@ICE-BOX>
Date:	Thu, 24 Dec 2009 23:44:30 +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: move a dereference below a NULL test

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

Signed-off-by: Darren Jenkins <darrenrjenkins@...il.com>
diff --git a/drivers/gpu/drm/radeon/radeon_irq.c
b/drivers/gpu/drm/radeon/radeon_irq.c
index b79ecc4..2f349a3 100644
--- a/drivers/gpu/drm/radeon/radeon_irq.c
+++ b/drivers/gpu/drm/radeon/radeon_irq.c
@@ -289,16 +289,16 @@ int radeon_irq_emit(struct drm_device *dev, void
*data, struct drm_file *file_pr
 	drm_radeon_irq_emit_t *emit = data;
 	int result;
 
-	if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
-		return -EINVAL;
-
-	LOCK_TEST_WITH_RETURN(dev, file_priv);
-
 	if (!dev_priv) {
 		DRM_ERROR("called with no initialization\n");
 		return -EINVAL;
 	}
 
+	if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
+		return -EINVAL;
+
+	LOCK_TEST_WITH_RETURN(dev, file_priv);
+
 	result = radeon_emit_irq(dev);
 
 	if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {


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