Mesa (master): mesa: Guard against null pointer deref in fbo validation

[Brian Paul]

Module: Mesa
Branch: master
Commit: c7339d42c603048c0f89276da6576647c4421ba0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c7339d42c603048c0f89276da6576647c4421ba0

Author: Fabian Bieler <der.fabe at gmx.net>
Date:   Tue Apr  5 07:51:01 2011 -0600

mesa: Guard against null pointer deref in fbo validation

This matches the behaviour below when numSamples is compared.

At least with the gallium state tracker this can actually occur if st_render_texture fails.

Signed-off-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/main/fbobject.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index f0065ad..eb1fef5 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -746,7 +746,7 @@ _mesa_test_framebuffer_completeness(struct gl_context *ctx,
          continue;
       }
 
-      if (numSamples < 0) {
+      if (att->Renderbuffer && numSamples < 0) {
          /* first buffer */
          numSamples = att->Renderbuffer->NumSamples;
       }