[PATCH 6.11 065/135] drm/vmwgfx: Handle surface check failure correctly

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

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

From: Nikolay Kuratov <kniv@xxxxxxxxxxxxxx>

commit 26498b8d54373d31a621d7dec95c4bd842563b3b upstream.

Currently if condition (!bo and !vmw_kms_srf_ok()) was met
we go to err_out with ret == 0.
err_out dereferences vfb if ret == 0, but in our case vfb is still NULL.

Fix this by assigning sensible error to ret.

Found by Linux Verification Center (linuxtesting.org) with SVACE

Signed-off-by: Nikolay Kuratov <kniv@xxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 810b3e1683d0 ("drm/vmwgfx: Support topology greater than texture size")
Signed-off-by: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20241002122429.1981822-1-kniv@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1510,6 +1510,7 @@ static struct drm_framebuffer *vmw_kms_f
 		DRM_ERROR("Surface size cannot exceed %dx%d\n",
 			dev_priv->texture_max_width,
 			dev_priv->texture_max_height);
+		ret = -EINVAL;
 		goto err_out;
 	}
 






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