linux-kernel - [PATCH 4.9 08/66] drm/vc4: Return -EINVAL on the overflow checks failing.

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Date:   Tue, 31 Jan 2017 06:36:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 4.9 08/66] drm/vc4: Return -EINVAL on the overflow checks failing.

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Anholt <eric@...olt.net>

commit 6b8ac63847bc2f958dd93c09edc941a0118992d9 upstream.

By failing to set the errno, we'd continue on to trying to set up the
RCL, and then oops on trying to dereference the tile_bo that binning
validation should have set up.

Reported-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Eric Anholt <eric@...olt.net>
Fixes: d5b1a78a772f ("drm/vc4: Add support for drawing 3D frames.")
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vc4/vc4_gem.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -601,6 +601,7 @@ vc4_get_bcl(struct drm_device *dev, stru
 					  sizeof(struct vc4_shader_state)) ||
 	    temp_size < exec_size) {
 		DRM_ERROR("overflow in exec arguments\n");
+		ret = -EINVAL;
 		goto fail;
 	}