Mesa (master): llvmpipe: Fix null pointer dereference when no depth buffer is bound.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: ba33fed6106609ed04612b46011e28fab69d2310
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ba33fed6106609ed04612b46011e28fab69d2310

Author: José Fonseca <jfonseca at vmware.com>
Date:   Wed Feb 10 11:25:26 2010 +0000

llvmpipe: Fix null pointer dereference when no depth buffer is bound.

---

 src/gallium/drivers/llvmpipe/lp_rast_priv.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/gallium/drivers/llvmpipe/lp_rast_priv.h b/src/gallium/drivers/llvmpipe/lp_rast_priv.h
index 4760d33..5c5497e 100644
--- a/src/gallium/drivers/llvmpipe/lp_rast_priv.h
+++ b/src/gallium/drivers/llvmpipe/lp_rast_priv.h
@@ -139,6 +139,9 @@ lp_rast_depth_pointer( struct lp_rasterizer *rast,
    void * depth;
    assert((x % TILE_VECTOR_WIDTH) == 0);
    assert((y % TILE_VECTOR_HEIGHT) == 0);
+   if(!rast->zsbuf_map)
+      return NULL;
+   assert(rast->zsbuf_transfer);
    depth = rast->zsbuf_map +
            y*rast->zsbuf_transfer->stride +
            TILE_VECTOR_HEIGHT*x*util_format_get_blocksize(rast->zsbuf_transfer->texture->format);