diff --git a/common/bstrlib/bstrlib.c b/common/bstrlib/bstrlib.c
index e44e76d..0c051f6 100644
--- a/common/bstrlib/bstrlib.c
+++ b/common/bstrlib/bstrlib.c
@@ -2398,7 +2398,10 @@ int i, c, v;
 	} else {
 		v = (bl->qty - 1) * len;
 		if ((bl->qty > 512 || len > 127) &&
-		    v / len != bl->qty - 1) return NULL; /* Overflow */
+		    v / len != bl->qty - 1) {
+			bstr__free (b);
+			return NULL; /* Overflow */
+		}
 		if (v > INT_MAX - c) {
 			bstr__free (b);
 			return NULL;	/* Overflow */