http://lists.gnu.org/archive/html/bug-texinfo/2007-10/msg00025.html

--- texinfo-4.11/info/window.c
+++ texinfo-4.11/info/window.c
@@ -1,5 +1,5 @@
 /* window.c -- windows in Info.
-   $Id: window.c,v 1.7 2007/07/01 21:20:31 karl Exp $
+   $Id: window.c,v 1.8 2007/10/19 18:43:20 karl Exp $
 
    Copyright (C) 1993, 1997, 1998, 2001, 2002, 2003, 2004, 2007
    Free Software Foundation, Inc.
@@ -249,9 +249,22 @@
               break;
             }
           else
-            win= win->next;
+            win = win->next;
         }
     }
+
+  /* One more loop.  If any heights or widths have become negative,
+     set them to zero.  This can apparently happen with resizing down to
+     very small sizes.  Sadly, it is not apparent to me where in the
+     above calculations it goes wrong.  */
+  for (win = windows; win; win = win->next)
+    {
+      if (win->height < 0)
+        win->height = 0;
+
+      if (win->width < 0)
+        win->width = 0;
+    }
 }
 
 /* Make a new window showing NODE, and return that window structure.
--- texinfo-4.11/info/display.c
+++ texinfo-4.11/info/display.c
@@ -1,5 +1,5 @@
 /* display.c -- How to display Info windows.
-   $Id: display.c,v 1.11 2007/07/01 21:20:29 karl Exp $
+   $Id: display.c,v 1.12 2007/10/19 18:43:20 karl Exp $
 
    Copyright (C) 1993, 1997, 2003, 2004, 2006, 2007
    Free Software Foundation, Inc.
@@ -136,8 +136,13 @@
   if (display_inhibited)
     display_was_interrupted_p = 1;
 
-  /* If the window has no height, or display is inhibited, quit now. */
-  if (!win->height || display_inhibited)
+  /* If the window has no height, or display is inhibited, quit now.
+     Strictly speaking, it should only be necessary to test if the
+     values are equal to zero, since window_new_screen_size should
+     ensure that the window height/width never becomes negative, but
+     since historically this has often been the culprit for crashes, do
+     our best to be doubly safe.  */
+  if (win->height <= 0 || win->width <= 0 || display_inhibited)
     return;
 
   /* If the window's first row doesn't appear in the_screen, then it