Index: head/usr.bin/ar/write.c
===================================================================
--- head/usr.bin/ar/write.c
+++ head/usr.bin/ar/write.c
@@ -124,6 +124,7 @@
 	struct ar_obj		*obj;
 	struct stat		 sb;
 	const char		*bname;
+	char			*tmpname;
 
 	if (name == NULL)
 		return (NULL);
@@ -137,7 +138,10 @@
 		return (NULL);
 	}
 
-	if ((bname = basename(name)) == NULL)
+	tmpname = strdup(name);
+	if (tmpname == NULL)
+		bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
+	if ((bname = basename(tmpname)) == NULL)
 		bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
 	if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
 		if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
@@ -147,6 +151,7 @@
 	} else
 		if ((obj->name = strdup(bname)) == NULL)
 		    bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
+	free(tmpname);
 
 	if (fstat(obj->fd, &sb) < 0) {
 		bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);