If the size is 0, there is nothing to do and st_obj->buffer can be NULL.
st_obj->buffer should not be NULL in any other case.
This fixes a segfault in Topogun. Reported by Jose Fonseca.
---
src/mesa/state_tracker/st_cb_bufferobjects.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.c
b/src/mesa/state_tracker/st_cb_bufferobjects.c
index 1b3991c..b1fbe03 100644
--- a/src/mesa/state_tracker/st_cb_bufferobjects.c
+++ b/src/mesa/state_tracker/st_cb_bufferobjects.c
@@ -182,13 +182,16 @@ st_bufferobj_data(struct gl_context *ctx,
struct st_buffer_object *st_obj = st_buffer_object(obj);
unsigned bind, pipe_usage;
- if (st_obj->Base.Size == size && st_obj->Base.Usage == usage && data) {
+ if (size && data &&
+ st_obj->Base.Size == size && st_obj->Base.Usage == usage) {
/* Just discard the old contents and write new data.
* This should be the same as creating a new buffer, but we avoid
* a lot of validation in Mesa.
*/
struct pipe_box box;
+ assert(st_obj->buffer);
+
u_box_1d(0, size, &box);
pipe->transfer_inline_write(pipe, st_obj->buffer, 0,
PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE,
--
1.7.10.4
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