#! /bin/sh -e

# DP: Issue #8154, fix segfault with os.execlp('true')

dir=
if [ $# -eq 3 -a "$2" = '-d' ]; then
    pdir="-d $3"
    dir="$3/"
elif [ $# -ne 1 ]; then
    echo >&2 "usage: `basename $0`: -patch|-unpatch [-d <srcdir>]"
    exit 1
fi
case "$1" in
    -patch)
        patch $pdir -f --no-backup-if-mismatch -p0 < $0
        ;;
    -unpatch)
        patch $pdir -f --no-backup-if-mismatch -R -p0 < $0
        ;;
    *)
	echo >&2 "usage: `basename $0`: -patch|-unpatch [-d <srcdir>]"
        exit 1
esac
exit 0

Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 78987)
+++ Modules/posixmodule.c	(working copy)
@@ -2952,6 +2952,11 @@
                 PyMem_Free(path);
 		return NULL;
 	}
+	if (argc < 1) {
+		PyErr_SetString(PyExc_ValueError, "execv() arg 2 must not be empty");
+                PyMem_Free(path);
+		return NULL;
+	}
 
 	argvlist = PyMem_NEW(char *, argc+1);
 	if (argvlist == NULL) {