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- --- linux-2.4.21/mm/mmap.c	2003-06-13 15:51:39.000000000 +0100
+++ linux-2.4.22/mm/mmap.c	2003-12-12 03:31:50.000000000 +0000
@@ -1042,6 +1050,14 @@
 		return addr;
 
 	/*
+	 * Fix security hole in kernels prior to 2.4.23 -- jcm.
+	 *
+	 */
+	
+	if ((addr + len) > TASK_SIZE || (addr + len) < addr)
+		return -EINVAL;
+	
+	/*
 	 * mlock MCL_FUTURE?
 	 */
 	if (mm->def_flags & VM_LOCKED) {
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