[PATCH] app/testpmd: fix issue with memory leaks when quit testpmd

[Ke Zhang]

when dpdk is compiled in ASan, there is a memory leaks after
quit testpmd if set mcast_addr, this patch fix this issue.

Error info as following:
ERROR: LeakSanitizer: detected memory leaksDirect leak of
       192 byte(s)
0 0x7f6a2e0aeffe in __interceptor_realloc
	(/lib/x86_64-linux-gnu/libasan.so.5+0x10dffe)
1 0x565361eb340f in mcast_addr_pool_extend
	../app/test-pmd/config.c:5162
2 0x565361eb3556 in mcast_addr_pool_append
	../app/test-pmd/config.c:5180
3 0x565361eb3aae in mcast_addr_add
	../app/test-pmd/config.c:5243

Signed-off-by: Ke Zhang <ke1x.zhang at intel.com>
---
 app/test-pmd/testpmd.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index fe2ce19f99..fa7f80fdf7 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -2742,6 +2742,8 @@ start_port(portid_t pid)
 			continue;
 		}
 
+		port->mc_addr_pool = NULL;
+
 		if (port->need_reconfig > 0) {
 			struct rte_eth_conf dev_conf;
 			int k;
@@ -3065,6 +3067,16 @@ stop_port(portid_t pid)
 		if (eth_dev_stop_mp(pi) != 0)
 			RTE_LOG(ERR, EAL, "rte_eth_dev_stop failed for port %u\n",
 				pi);
+		/*
+		 * free the pool of multicast addresses. If it is NULL,
+		 * it means there is no mc addr.Make sure the mc_addr_pool
+		 * is NULL at port init.
+		 */
+		if (port->mc_addr_pool != NULL) {
+			free(port->mc_addr_pool);
+			port->mc_addr_pool = NULL;
+		}
+		port->mc_addr_nb = 0;
 
 		if (port->port_status == RTE_PORT_HANDLING)
 			port->port_status = RTE_PORT_STOPPED;
-- 
2.25.1