Mesa (master): st/mesa: Handle st_framebuffer_create returning NULL

[Brian Paul]

Module: Mesa
Branch: master
Commit: 655a32f729a46176c1fc0c1727b33c15c69cad78
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=655a32f729a46176c1fc0c1727b33c15c69cad78

Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Thu Jul 13 01:21:00 2017 -0600

st/mesa: Handle st_framebuffer_create returning NULL

st_framebuffer_create returns NULL if stfbi == NULL or
st_framebuffer_add_renderbuffer returns false for the colour buffer.

Fixes Xorg crashing on startup using glamor on radeonsi.

Fixes: 147d7fb772a7 ("st/mesa: add a winsys buffers list in st_context")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101775
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>
Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/state_tracker/st_manager.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
index de16a3a2cf..348b456c4d 100644
--- a/src/mesa/state_tracker/st_manager.c
+++ b/src/mesa/state_tracker/st_manager.c
@@ -802,10 +802,12 @@ st_framebuffer_reuse_or_create(struct st_context *st,
    if (stfb == NULL) {
       cur = st_framebuffer_create(st, stfbi);
 
-      /* add to the context's winsys buffers list */
-      LIST_ADD(&cur->head, &st->winsys_buffers);
+      if (cur) {
+         /* add to the context's winsys buffers list */
+         LIST_ADD(&cur->head, &st->winsys_buffers);
 
-      st_framebuffer_reference(&stfb, cur);
+         st_framebuffer_reference(&stfb, cur);
+      }
    }
 
    return stfb;