[Mesa-stable] [PATCH] winsys/svga: Fix incorrect type usage in IOCTL v2

[Thomas Hellstrom]

While similar in layout, the size of the SVGA3dSize type may be smaller than
the struct drm_vmw_size type that is part of the ioctl interface. The kernel
driver could accordingly overwrite a memory area following the size variable
on the stack. Typically that would be another local variable, causing
breakage in, for example, ubuntu 12.04.5 where the handle local variable
becomes overwritten.

v2: Fix whitespace errors

Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob at vmware.com>
Cc: "10.1 10.2 10.3" <mesa-stable at lists.freedesktop.org>
---
 src/gallium/winsys/svga/drm/vmw_screen_dri.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/gallium/winsys/svga/drm/vmw_screen_dri.c b/src/gallium/winsys/svga/drm/vmw_screen_dri.c
index 79a1b3e..9f33590 100644
--- a/src/gallium/winsys/svga/drm/vmw_screen_dri.c
+++ b/src/gallium/winsys/svga/drm/vmw_screen_dri.c
@@ -238,7 +238,7 @@ out_mip:
 
 static struct svga_winsys_surface *
 vmw_drm_surface_from_handle(struct svga_winsys_screen *sws,
-			    struct winsys_handle *whandle,
+                            struct winsys_handle *whandle,
 			    SVGA3dSurfaceFormat *format)
 {
     struct vmw_svga_winsys_surface *vsrf;
@@ -248,7 +248,8 @@ vmw_drm_surface_from_handle(struct svga_winsys_screen *sws,
     struct drm_vmw_surface_arg *req = &arg.req;
     struct drm_vmw_surface_create_req *rep = &arg.rep;
     uint32_t handle = 0;
-    SVGA3dSize size;
+    struct drm_vmw_size size;
+    SVGA3dSize base_size;
     int ret;
     int i;
 
@@ -274,7 +275,7 @@ vmw_drm_surface_from_handle(struct svga_winsys_screen *sws,
 
     memset(&arg, 0, sizeof(arg));
     req->sid = handle;
-    rep->size_addr = (size_t)&size;
+    rep->size_addr = (unsigned long)&size;
 
     ret = drmCommandWriteRead(vws->ioctl.drm_fd, DRM_VMW_REF_SURFACE,
 			      &arg, sizeof(arg));
@@ -324,7 +325,11 @@ vmw_drm_surface_from_handle(struct svga_winsys_screen *sws,
     *format = rep->format;
 
     /* Estimate usage, for early flushing. */
-    vsrf->size = svga3dsurface_get_serialized_size(rep->format, size,
+
+    base_size.width = size.width;
+    base_size.height = size.height;
+    base_size.depth = size.depth;
+    vsrf->size = svga3dsurface_get_serialized_size(rep->format, base_size,
                                                    rep->mip_levels[0],
                                                    FALSE);
 
-- 
1.8.3.2