mptcp: Fix memory leak when getting limits

When running the command `ip mptcp limits` under valgrind, it reports

32,768 bytes in 1 blocks are definitely lost in loss record 1 of 1
   at 0x483F7B5: malloc (vg_replace_malloc.c:381)
   by 0x17A0BC: rtnl_recvmsg (libnetlink.c:838)
   by 0x17A3A1: __rtnl_talk_iov.constprop.0 (libnetlink.c:1040)
   by 0x17B864: __rtnl_talk (libnetlink.c:1141)
   by 0x17B864: rtnl_talk (libnetlink.c:1147)
   by 0x16837D: mptcp_limit_get_set (ipmptcp.c:436)
   by 0x1174CB: do_cmd (ip.c:136)
   by 0x116F7C: main (ip.c:324)

Free the answer obtained from rtnl_talk().

Fixes: 7e0767cd862b ("add support for mptcp netlink interface")
Suggested-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Benjamin Poirier <bpoirier@nvidia.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

diff --git a/ip/ipmptcp.c b/ip/ipmptcp.c
index 54817e4675ba43a48dbfa71fc3ad4ea68dbb3072..ce62ab9a4e89cf7a59965bdd346d4f2a245ccf95 100644 (file)
--- a/ip/ipmptcp.c
+++ b/ip/ipmptcp.c
@@ -436,9 +436,13 @@ static int mptcp_limit_get_set(int argc, char **argv, int cmd)
        if (rtnl_talk(&genl_rth, &req.n, do_get ? &answer : NULL) < 0)
                return -2;
 
-       if (do_get)
-               return print_mptcp_limit(answer, stdout);
-       return 0;
+       ret = 0;
+       if (do_get) {
+               ret = print_mptcp_limit(answer, stdout);
+               free(answer);
+       }
+
+       return ret;
 }
 
 static const char * const event_to_str[] = {