svga: don't use uninitialized framebuffer state

Only the first 'nr_cbufs' color buffers in the pipe_framebuffer_state are
valid.  The rest of the color buffer pointers might be unitialized.
Fixes a regression in the piglit fbo-srgb-blit test since changes in the
gallium blitter code.

NOTE: This is a candidate for the 9.0 branch (just to be safe).

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>

diff --git a/src/gallium/drivers/svga/svga_pipe_misc.c b/src/gallium/drivers/svga/svga_pipe_misc.c
index 56f2599313494445192b976ec9efd19eb99aba6c..2b6269a7b2edaea5a524b11997940905bb89df6b 100644 (file)
--- a/src/gallium/drivers/svga/svga_pipe_misc.c
+++ b/src/gallium/drivers/svga/svga_pipe_misc.c
@@ -107,8 +107,10 @@ static void svga_set_framebuffer_state(struct pipe_context *pipe,
       }
    }
 
-   for (i = 0; i < PIPE_MAX_COLOR_BUFS; i++)
-      pipe_surface_reference(&dst->cbufs[i], fb->cbufs[i]);
+   for (i = 0; i < PIPE_MAX_COLOR_BUFS; i++) {
+      pipe_surface_reference(&dst->cbufs[i],
+                             (i < fb->nr_cbufs) ? fb->cbufs[i] : NULL);
+   }
    pipe_surface_reference(&dst->zsbuf, fb->zsbuf);