patch from sadrul against invalid reads in ResizeLayer

resizelayer-read.diff

commit d89aeca5126ed9c08772d6cae50f4221be2e0c54
Author: Friedrich Delgado Friedrichs <[email protected]>
Date:   Fri Mar 12 14:08:16 2010 +0100

    apply patch from sadrul against invalid reads in ResizeLayer (http://pastebin.ca/1835311)

diff --git a/src/resize.c b/src/resize.c
index 7782c2b..5d1df4b 100644
--- a/src/resize.c
+++ b/src/resize.c
@@ -369,8 +369,7 @@ struct display *norefdisp;
   /* If 'flayer' and 'l' are for the same window, then we will not
    * restore 'flayer'. */
   if (oldflayer && (l == oldflayer || Layer2Window(oldflayer) == p))
-    while (oldflayer->l_next)
-      oldflayer = oldflayer->l_next;
+    oldflayer = NULL;
 
   flayer = l;
 
@@ -413,7 +412,7 @@ struct display *norefdisp;
 
   /* If we started resizing a non-flayer layer, then restore the flayer.
    * Otherwise, flayer should already be updated to the topmost foreground layer. */
-  if (Layer2Window(flayer) != Layer2Window(oldflayer))
+  if (oldflayer)
     flayer = oldflayer;
   display = olddisplay;
 }