[PATCH net] dccp: fix a memleak for dccp_feat_init err process

[Xin Long]

In dccp_feat_init, when ccid_get_builtin_ccids failsto alloc
memory for rx.val, it should free tx.val before returning an
error.

Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/dccp/feat.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index 1704948..f227f00 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -1471,9 +1471,12 @@ int dccp_feat_init(struct sock *sk)
         * singleton values (which always leads to failure).
         * These settings can still (later) be overridden via sockopts.
         */
-       if (ccid_get_builtin_ccids(&tx.val, &tx.len) ||
-           ccid_get_builtin_ccids(&rx.val, &rx.len))
+       if (ccid_get_builtin_ccids(&tx.val, &tx.len))
                return -ENOBUFS;
+       if (ccid_get_builtin_ccids(&rx.val, &rx.len)) {
+               kfree(tx.val);
+               return -ENOBUFS;
+       }
 
        if (!dccp_feat_prefer(sysctl_dccp_tx_ccid, tx.val, tx.len) ||
            !dccp_feat_prefer(sysctl_dccp_rx_ccid, rx.val, rx.len))
-- 
2.1.0