r300g: reject resources from handles which are not large enough

The driver gets a buffer and its size in resource_from_handle.
It computes the required minimum buffer size from given texture
properties, and compares the two sizes.

This is to early detect DDX bugs.

2 files changed, 9 insertions, 4 deletions

diff --git a/src/gallium/winsys/radeon/drm/radeon_drm_buffer.c b/src/gallium/winsys/radeon/drm/radeon_drm_buffer.c
index 5ea5912089e..017eac8464e 100644
--- a/src/gallium/winsys/radeon/drm/radeon_drm_buffer.c
+++ b/src/gallium/winsys/radeon/drm/radeon_drm_buffer.c
@@ -189,7 +189,7 @@ struct pb_buffer *radeon_drm_bufmgr_create_buffer_from_handle(struct pb_manager
     pipe_reference_init(&buf->base.base.reference, 1);
     buf->base.base.alignment = 0;
     buf->base.base.usage = PB_USAGE_GPU_WRITE | PB_USAGE_GPU_READ;
-    buf->base.base.size = 0;
+    buf->base.base.size = bo->size;
     buf->base.vtbl = &radeon_drm_buffer_vtbl;
     buf->mgr = mgr;
 
diff --git a/src/gallium/winsys/radeon/drm/radeon_r300.c b/src/gallium/winsys/radeon/drm/radeon_r300.c
index effa27f5c72..55445040671 100644
--- a/src/gallium/winsys/radeon/drm/radeon_r300.c
+++ b/src/gallium/winsys/radeon/drm/radeon_r300.c
@@ -109,14 +109,19 @@ static void radeon_r300_winsys_buffer_reference(struct r300_winsys_screen *rws,
 
 static struct r300_winsys_buffer *radeon_r300_winsys_buffer_from_handle(struct r300_winsys_screen *rws,
                                                                         struct winsys_handle *whandle,
-                                                                        unsigned *stride)
+                                                                        unsigned *stride,
+                                                                        unsigned *size)
 {
     struct radeon_libdrm_winsys *ws = radeon_libdrm_winsys(rws);
     struct pb_buffer *_buf;
 
-    *stride = whandle->stride;
-
     _buf = radeon_drm_bufmgr_create_buffer_from_handle(ws->kman, whandle->handle);
+
+    if (stride)
+        *stride = whandle->stride;
+    if (size)
+        *size = _buf->base.size;
+
     return radeon_libdrm_winsys_buffer(_buf);
 }