fix for bug 27384

diff --git a/ext/standard/pack.c b/ext/standard/pack.c
index 070fa8f26d8f124669d30011c015159da47892e3..0376a7316a5a3a8605f13c6ca1100c7f15de7be2 100644 (file)
--- a/ext/standard/pack.c
+++ b/ext/standard/pack.c
@@ -640,7 +640,7 @@ PHP_FUNCTION(unpack)
                        /* Space for name + number, safe as namelen is ensured <= 200 */
                        char n[256];
 
-                       if (arg != 1) {
+                       if (arg != 1 || namelen == 0) {
                                /* Need to add element number to name */
                                sprintf(n, "%.*s%d", namelen, name, i + 1);
                        } else {