Henri Verbeet : ddraw: Just return an error if we failed to find the predecessor in ddraw_surface_delete_attached_surface ().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 644724d32cf832db895c4ed58a1e0ac31363077c
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=644724d32cf832db895c4ed58a1e0ac31363077c

Author: Henri Verbeet <hverbeet at codeweavers.com>
Date:   Tue Mar 15 16:55:11 2016 +0100

ddraw: Just return an error if we failed to find the predecessor in ddraw_surface_delete_attached_surface().

Signed-off-by: Henri Verbeet <hverbeet at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/ddraw/surface.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/dlls/ddraw/surface.c b/dlls/ddraw/surface.c
index 9e28655..3709b94 100644
--- a/dlls/ddraw/surface.c
+++ b/dlls/ddraw/surface.c
@@ -1982,16 +1982,16 @@ static HRESULT ddraw_surface_delete_attached_surface(struct ddraw_surface *surfa
     }
 
     /* Find the predecessor of the detached surface */
-    while (prev)
+    while (prev->next_attached != attachment)
     {
-        if (prev->next_attached == attachment)
-            break;
-        prev = prev->next_attached;
+        if (!(prev = prev->next_attached))
+        {
+            ERR("Failed to find predecessor of %p.\n", attachment);
+            wined3d_mutex_unlock();
+            return DDERR_SURFACENOTATTACHED;
+        }
     }
 
-    /* There must be a surface, otherwise there's a bug */
-    assert(prev);
-
     /* Unchain the surface */
     prev->next_attached = attachment->next_attached;
     attachment->next_attached = NULL;