Index: contrib/libarchive/libarchive/archive_write_set_format_ar.c
===================================================================
--- contrib/libarchive/libarchive/archive_write_set_format_ar.c
+++ contrib/libarchive/libarchive/archive_write_set_format_ar.c
@@ -374,13 +374,14 @@
 			return (ARCHIVE_WARN);
 		}
 
-		ar->strtab = (char *)malloc(s);
+		ar->strtab = (char *)malloc(s + 1);
 		if (ar->strtab == NULL) {
 			archive_set_error(&a->archive, ENOMEM,
 			    "Can't allocate strtab buffer");
 			return (ARCHIVE_FATAL);
 		}
 		strncpy(ar->strtab, buff, s);
+		ar->strtab[s] = '\0';
 		ar->has_strtab = 1;
 	}