From f58e985a63d1ac579bb3bb48cc49ec0fdff7d3ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Tue, 19 Jan 2016 14:14:34 +0100
Subject: [PATCH] renderer: report error on invalid surface
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Instead of later crashing.

Fix found thanks to american fuzzy lop.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 src/vrend_renderer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/vrend_renderer.c b/src/vrend_renderer.c
index 20d2946..5374f09 100644
--- a/src/vrend_renderer.c
+++ b/src/vrend_renderer.c
@@ -1530,7 +1530,10 @@ void vrend_set_framebuffer_state(struct vrend_context *ctx,
             break;
          }
       }
-      assert(surf);
+      if (surf == NULL) {
+         report_context_error(ctx, VIRGL_ERROR_CTX_ILLEGAL_SURFACE, i);
+         return;
+      }
       new_height = u_minify(surf->texture->base.height0, surf->val0);
       new_ibf = surf->texture->y_0_top ? true : false;
    }