From: Eric Anholt <eric@anholt.net>
Date: Tue, 26 Jul 2016 20:47:15 +0000 (-0700)
Subject: drm/vc4: Fix oops when userspace hands in a bad BO.
X-Git-Tag: v4.8-rc7~11^2^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=552416c146fadc67cd9b53ef7adf88d3381c43a6;p=platform%2Fkernel%2Flinux-exynos.git

drm/vc4: Fix oops when userspace hands in a bad BO.

We'd end up NULL pointer dereferencing because we didn't take the
error path out in the parent.  Fixes igt vc4_lookup_fail test.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: d5b1a78a772f ("drm/vc4: Add support for drawing 3D frames.")
Cc: stable@vger.kernel.org
---

diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
index fba2c83..b262c5c 100644
--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -573,7 +573,7 @@ vc4_cl_lookup_bos(struct drm_device *dev,
 
 fail:
 	drm_free_large(handles);
-	return 0;
+	return ret;
 }
 
 static int