st/mesa: add null pointer check in st_texture_image_map()

If we failed to allocate a memory resource for the texture we'd crash
when we tried to map it.  Now we propogate the NULL back up to the
texstore code and generate GL_OUT_OF_MEMORY.

Fixes a crash with the upcoming piglit max-texture-size test.

NOTE: This is a candidate for the 8.0 branch.

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

diff --git a/src/mesa/state_tracker/st_texture.c b/src/mesa/state_tracker/st_texture.c
index 132d7a8..9627a61 100644 (file)
--- a/src/mesa/state_tracker/st_texture.c
+++ b/src/mesa/state_tracker/st_texture.c
@@ -222,6 +222,9 @@ st_texture_image_map(struct st_context *st, struct st_texture_image *stImage,
 
    DBG("%s \n", __FUNCTION__);
 
+   if (!stImage->pt)
+      return NULL;
+
    if (stObj->pt != stImage->pt)
       level = 0;
    else