Quoting Kenneth Graunke (2017-07-05 21:56:53)
> diff --git a/src/mesa/drivers/dri/i965/intel_buffer_objects.c
> b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
> index a9ac29a6a81..2b0f7b9a698 100644
> --- a/src/mesa/drivers/dri/i965/intel_buffer_objects.c
> +++ b/src/mesa/drivers/dri/i965/intel_buffer_objects.c
> @@ -289,7 +289,10 @@ brw_get_buffer_subdata(struct gl_context *ctx,
> if (brw_batch_references(&brw->batch, intel_obj->buffer)) {
> intel_batchbuffer_flush(brw);
> }
> - brw_bo_get_subdata(intel_obj->buffer, offset, size, data);
> +
> + void *map = brw_bo_map(brw, intel_obj->buffer, MAP_READ);
Be paranoid and wrap this in a if (map). Data pointer is provided by the
user? otherwise you probably want to memset it on failure.
> + memcpy(data, map + offset, size);
> + brw_bo_unmap(intel_obj->buffer);
>
> mark_buffer_inactive(intel_obj);
> }
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