Fix #78665: Multicasting may leak memory

Author: cmb69

NEWS

@@ -10,6 +10,9 @@ PHP                                                                        NEWS
   . Fixed bug #78642 (Wrong libiconv version displayed). (gedas at martynas,
     cmb).
 
+- Sockets:
+  . Fixed bug #78665 (Multicasting may leak memory). (cmb)
+
 24 Oct 2019, PHP 7.2.24
 
 - Core:

ext/sockets/multicast.c

@@ -652,6 +652,7 @@ int php_if_index_to_addr4(unsigned if_index, php_socket *php_sock, struct in_add
 		goto retry;
 	}
 	if (retval != NO_ERROR) {
+		efree(addr_table);
 		php_error_docref(NULL, E_WARNING,
 			"GetIpAddrTable failed with error %lu", retval);
 		return FAILURE;
@@ -660,9 +661,11 @@ int php_if_index_to_addr4(unsigned if_index, php_socket *php_sock, struct in_add
 		MIB_IPADDRROW r = addr_table->table[i];
 		if (r.dwIndex == if_index) {
 			out_addr->s_addr = r.dwAddr;
+			efree(addr_table);
 			return SUCCESS;
 		}
 	}
+	efree(addr_table);
 	php_error_docref(NULL, E_WARNING,
 		"No interface with index %u was found", if_index);
 	return FAILURE;
@@ -692,6 +695,7 @@ int php_add4_to_if_index(struct in_addr *addr, php_socket *php_sock, unsigned *i
 		goto retry;
 	}
 	if (retval != NO_ERROR) {
+		efree(addr_table);
 		php_error_docref(NULL, E_WARNING,
 			"GetIpAddrTable failed with error %lu", retval);
 		return FAILURE;
@@ -700,9 +704,11 @@ int php_add4_to_if_index(struct in_addr *addr, php_socket *php_sock, unsigned *i
 		MIB_IPADDRROW r = addr_table->table[i];
 		if (r.dwAddr == addr->s_addr) {
 			*if_index = r.dwIndex;
+			efree(addr_table);
 			return SUCCESS;
 		}
 	}
+	efree(addr_table);
 
 	{
 		char addr_str[17] = {0};