diff --git a/src/lib/libc/stdlib/strtoimax.c b/src/lib/libc/stdlib/strtoimax.c
index 2c77f416..2fc04e48 100644
--- a/src/lib/libc/stdlib/strtoimax.c
+++ b/src/lib/libc/stdlib/strtoimax.c
@@ -1,6 +1,5 @@
-/*	$OpenBSD: strtoimax.c,v 1.1 2006/01/13 17:58:09 millert Exp $	*/
-
-/*-
+/*	$OpenBSD: strtoimax.c,v 1.2 2014/09/13 20:10:12 schwarze Exp $	*/
+/*
  * Copyright (c) 1992 The Regents of the University of California.
  * All rights reserved.
  *
@@ -47,6 +46,17 @@ strtoimax(const char *nptr, char **endptr, int base)
 	int c;
 	int neg, any, cutlim;
 
+	/*
+	 * Ensure that base is between 2 and 36 inclusive, or the special
+	 * value of 0.
+	 */
+	if (base < 0 || base == 1 || base > 36) {
+		if (endptr != 0)
+			*endptr = (char *)nptr;
+		errno = EINVAL;
+		return 0;
+	}
+
 	/*
 	 * Skip white space and pick up leading +/- sign if any.
 	 * If base is 0, allow 0x for hex and 0 for octal, else
diff --git a/src/lib/libc/stdlib/strtol.c b/src/lib/libc/stdlib/strtol.c
index dc2cf887..86cec350 100644
--- a/src/lib/libc/stdlib/strtol.c
+++ b/src/lib/libc/stdlib/strtol.c
@@ -1,5 +1,5 @@
-/*	$OpenBSD: strtol.c,v 1.9 2013/04/17 17:40:35 tedu Exp $ */
-/*-
+/*	$OpenBSD: strtol.c,v 1.10 2014/09/13 20:10:12 schwarze Exp $ */
+/*
  * Copyright (c) 1990 The Regents of the University of California.
  * All rights reserved.
  *
@@ -33,7 +33,6 @@
 #include <limits.h>
 #include <stdlib.h>
 
-
 /*
  * Convert a string to a long integer.
  *
@@ -52,7 +51,7 @@ strtol(const char *nptr, char **endptr, int base)
 	 * Ensure that base is between 2 and 36 inclusive, or the special
 	 * value of 0.
 	 */
-	if (base != 0 && (base < 2 || base > 36)) {
+	if (base < 0 || base == 1 || base > 36) {
 		if (endptr != 0)
 			*endptr = (char *)nptr;
 		errno = EINVAL;
diff --git a/src/lib/libc/stdlib/strtoll.c b/src/lib/libc/stdlib/strtoll.c
index 4bcc5565..cf82c8e1 100644
--- a/src/lib/libc/stdlib/strtoll.c
+++ b/src/lib/libc/stdlib/strtoll.c
@@ -1,5 +1,5 @@
-/* $OpenBSD: strtoll.c,v 1.7 2013/03/28 18:09:38 martynas Exp $ */
-/*-
+/*	$OpenBSD: strtoll.c,v 1.8 2014/09/13 20:10:12 schwarze Exp $ */
+/*
  * Copyright (c) 1992 The Regents of the University of California.
  * All rights reserved.
  *
@@ -49,6 +49,17 @@ strtoll(const char *nptr, char **endptr, int base)
 	int c;
 	int neg, any, cutlim;
 
+	/*
+	 * Ensure that base is between 2 and 36 inclusive, or the special
+	 * value of 0.
+	 */
+	if (base < 0 || base == 1 || base > 36) {
+		if (endptr != 0)
+			*endptr = (char *)nptr;
+		errno = EINVAL;
+		return 0;
+	}
+
 	/*
 	 * Skip white space and pick up leading +/- sign if any.
 	 * If base is 0, allow 0x for hex and 0 for octal, else
diff --git a/src/lib/libc/stdlib/strtoul.c b/src/lib/libc/stdlib/strtoul.c
index a236365d..2aa41b76 100644
--- a/src/lib/libc/stdlib/strtoul.c
+++ b/src/lib/libc/stdlib/strtoul.c
@@ -1,6 +1,6 @@
-/*	$OpenBSD: strtoul.c,v 1.8 2013/04/17 17:40:35 tedu Exp $ */
+/*	$OpenBSD: strtoul.c,v 1.9 2014/09/13 20:10:12 schwarze Exp $ */
 /*
- * Copyright (c) 1990 Regents of the University of California.
+ * Copyright (c) 1990 The Regents of the University of California.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -50,6 +50,13 @@ strtoul(const char *nptr, char **endptr, int base)
 	/*
 	 * See strtol for comments as to the logic used.
 	 */
+	if (base < 0 || base == 1 || base > 36) {
+		if (endptr != 0)
+			*endptr = (char *)nptr;
+		errno = EINVAL;
+		return 0;
+	}
+
 	s = nptr;
 	do {
 		c = (unsigned char) *s++;
diff --git a/src/lib/libc/stdlib/strtoull.c b/src/lib/libc/stdlib/strtoull.c
index 28f613a0..84641763 100644
--- a/src/lib/libc/stdlib/strtoull.c
+++ b/src/lib/libc/stdlib/strtoull.c
@@ -1,5 +1,5 @@
-/*	$OpenBSD: strtoull.c,v 1.6 2013/03/28 18:09:38 martynas Exp $ */
-/*-
+/*	$OpenBSD: strtoull.c,v 1.7 2014/09/13 20:10:12 schwarze Exp $ */
+/*
  * Copyright (c) 1992 The Regents of the University of California.
  * All rights reserved.
  *
@@ -50,8 +50,15 @@ strtoull(const char *nptr, char **endptr, int base)
 	int neg, any, cutlim;
 
 	/*
-	 * See strtoq for comments as to the logic used.
+	 * See strtoll for comments as to the logic used.
 	 */
+	if (base < 0 || base == 1 || base > 36) {
+		if (endptr != 0)
+			*endptr = (char *)nptr;
+		errno = EINVAL;
+		return 0;
+	}
+
 	s = nptr;
 	do {
 		c = (unsigned char) *s++;
@@ -59,7 +66,7 @@ strtoull(const char *nptr, char **endptr, int base)
 	if (c == '-') {
 		neg = 1;
 		c = *s++;
-	} else { 
+	} else {
 		neg = 0;
 		if (c == '+')
 			c = *s++;
diff --git a/src/lib/libc/stdlib/strtoumax.c b/src/lib/libc/stdlib/strtoumax.c
index ce6e2c00..c73f7e50 100644
--- a/src/lib/libc/stdlib/strtoumax.c
+++ b/src/lib/libc/stdlib/strtoumax.c
@@ -1,6 +1,5 @@
-/*	$OpenBSD: strtoumax.c,v 1.1 2006/01/13 17:58:09 millert Exp $	*/
-
-/*-
+/*	$OpenBSD: strtoumax.c,v 1.2 2014/09/13 20:10:12 schwarze Exp $	*/
+/*
  * Copyright (c) 1992 The Regents of the University of California.
  * All rights reserved.
  *
@@ -48,8 +47,15 @@ strtoumax(const char *nptr, char **endptr, int base)
 	int neg, any, cutlim;
 
 	/*
-	 * See strtoq for comments as to the logic used.
+	 * See strtoimax for comments as to the logic used.
 	 */
+	if (base < 0 || base == 1 || base > 36) {
+		if (endptr != 0)
+			*endptr = (char *)nptr;
+		errno = EINVAL;
+		return 0;
+	}
+
 	s = nptr;
 	do {
 		c = (unsigned char) *s++;
@@ -57,7 +63,7 @@ strtoumax(const char *nptr, char **endptr, int base)
 	if (c == '-') {
 		neg = 1;
 		c = *s++;
-	} else { 
+	} else {
 		neg = 0;
 		if (c == '+')
 			c = *s++;