bgpd: Fix memory leak when creating BMP connection with a source interface

Testing done with:

```
for x in $(seq 1 100000); do vtysh -c 'conf' -c 'router bgp' -c 'bmp targets test' -c 'bmp connect localhost port 123 min-retry 100 max-retry 100 source-interface lo'; done
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
(cherry picked from commit 7d19cb59cf5b129f61f3c568899343b3f031f9b4)

diff --git a/bgpd/bgp_bmp.c b/bgpd/bgp_bmp.c
index 0ad85c984d8dc280e91781c936de11d80ea3804f..785345221e89e73ffc6141ab56c2de9f5f9f80d2 100644 (file)
--- a/bgpd/bgp_bmp.c
+++ b/bgpd/bgp_bmp.c
@@ -2392,8 +2392,11 @@ DEFPY(bmp_connect,
        }
 
        ba = bmp_active_get(bt, hostname, port);
-       if (srcif)
+       if (srcif) {
+               if (ba->ifsrc)
+                       XFREE(MTYPE_TMP, ba->ifsrc);
                ba->ifsrc = XSTRDUP(MTYPE_TMP, srcif);
+       }
        if (min_retry_str)
                ba->minretry = min_retry;
        if (max_retry_str)