=== modified file 'grub-core/gdb/cstub.c'
--- grub-core/gdb/cstub.c	2012-02-26 18:10:52 +0000
+++ grub-core/gdb/cstub.c	2012-03-18 13:46:51 +0000
@@ -57,27 +57,27 @@ grub_gdb_getpacket (void)
 
   while (1)
     {
       /* Wait around for the start character, ignore all other
          characters.  */
       while ((ch = grub_serial_port_fetch (grub_gdb_port)) != '$');
 
     retry:
       checksum = 0;
       xmitcsum = -1;
       count = 0;
 
       /* Now read until a # or end of buffer is found.  */
-      while (count < GRUB_GDB_COMBUF_SIZE)
+      while (count < GRUB_GDB_COMBUF_SIZE - 1)
 	{
 	  do
 	    ch = grub_serial_port_fetch (grub_gdb_port);
 	  while (ch < 0);
 	  if (ch == '$')
 	    goto retry;
 	  if (ch == '#')
 	    break;
 	  checksum += ch;
 	  buffer[count] = ch;
 	  count = count + 1;
 	}
       buffer[count] = 0;