Fixed bug #27258 (moved FPE check to correct location).

Fixed several possible FPE.

ext/gmp/gmp.c

@@ -312,6 +312,11 @@ static inline void gmp_zval_binary_ui_op_ex(zval *return_value, zval **a_arg, zv
 		FETCH_GMP_ZVAL(gmpnum_b, b_arg);
 	}
 
+	convert_to_long_ex(b_arg);
+	if (!Z_LVAL_PP(b_arg)) {
+		RETURN_FALSE;
+	}
+
 	INIT_GMP_NUM(gmpnum_result);
 
 	if (use_ui && gmp_ui_op) {
@@ -353,6 +358,11 @@ static inline void gmp_zval_binary_ui_op2_ex(zval *return_value, zval **a_arg, z
 		FETCH_GMP_ZVAL(gmpnum_b, b_arg);
 	}
 
+	convert_to_long_ex(b_arg);
+	if (!Z_LVAL_PP(b_arg)) {
+		RETURN_FALSE;
+	}
+
 	INIT_GMP_NUM(gmpnum_result1);
 	INIT_GMP_NUM(gmpnum_result2);
 
@@ -825,11 +835,6 @@ ZEND_FUNCTION(gmp_powm)
 		WRONG_PARAM_COUNT;
 	}
 
-	convert_to_long_ex(mod_arg);
-	if (!Z_LVAL_PP(mod_arg)) {
-		RETURN_FALSE;
-	}
-
 	FETCH_GMP_ZVAL(gmpnum_base, base_arg);
 
 	if (Z_TYPE_PP(exp_arg) == IS_LONG && Z_LVAL_PP(exp_arg) >= 0) {
@@ -839,6 +844,11 @@ ZEND_FUNCTION(gmp_powm)
 	}
 	FETCH_GMP_ZVAL(gmpnum_mod, mod_arg);
 
+	convert_to_long_ex(mod_arg);
+	if (!Z_LVAL_PP(mod_arg)) {
+		RETURN_FALSE;
+	}
+
 	INIT_GMP_NUM(gmpnum_result);
 	if (use_ui) {
 		mpz_powm_ui(*gmpnum_result, *gmpnum_base, (unsigned long)Z_LVAL_PP(exp_arg), *gmpnum_mod);