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--- shadow-4.1.2.1/libmisc/xmalloc.c 2008-08-30 21:55:44.000000000 -0500 +++ shadow-4.1.2.1/libmisc/xmalloc.c.new 2008-08-30 21:55:36.000000000 -0500 @@ -61,5 +61,6 @@ char *xstrdup (const char *str) { + if(str == NULL) return NULL; return strcpy (xmalloc (strlen (str) + 1), str); }