softpipe: Prevent NULL ptr derreference on takedown.

diff --git a/src/gallium/drivers/softpipe/sp_state_fs.c b/src/gallium/drivers/softpipe/sp_state_fs.c
index 24b91fbc79435aa7c390b7e65c7cde30ceb22f64..901c8f83e75ae87ca02463f722c74c0a530cc6e5 100644 (file)
--- a/src/gallium/drivers/softpipe/sp_state_fs.c
+++ b/src/gallium/drivers/softpipe/sp_state_fs.c
@@ -154,8 +154,8 @@ softpipe_set_constant_buffer(struct pipe_context *pipe,
    /* note: reference counting */
    pipe_buffer_reference(ws,
                         &softpipe->constants[shader].buffer,
-                        buf->buffer);
-   softpipe->constants[shader].size = buf->size;
+                        buf ? buf->buffer : NULL);
+   softpipe->constants[shader].size = buf ? buf->size : 0;
 
    softpipe->dirty |= SP_NEW_CONSTANTS;
 }