i915: Initialize Length and Offset fields when mapping a buffer object

This fixes an assertion failure in _mesa_MapBufferARB.

Fixes bugzilla #25253.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_buffer_objects.c b/src/mesa/drivers/dri/intel/intel_buffer_objects.c
index a0225936c81..ccce9e712d8 100644
--- a/src/mesa/drivers/dri/intel/intel_buffer_objects.c
+++ b/src/mesa/drivers/dri/intel/intel_buffer_objects.c
@@ -254,6 +254,8 @@ intel_bufferobj_map(GLcontext * ctx,
 
    if (intel_obj->sys_buffer) {
       obj->Pointer = intel_obj->sys_buffer;
+      obj->Length = obj->Size;
+      obj->Offset = 0;
       return obj->Pointer;
    }