xfrm: clone XFRMA_REPLAY_ESN_VAL in xfrm_do_migrate

stable inclusion
from linux-4.19.151
commit fb48241729bd18dfa252f0e60ea88f331f10e968

--------------------------------

[ Upstream commit 91a46c6d ]

XFRMA_REPLAY_ESN_VAL was not cloned completely from the old to the new.
Migrate this attribute during XFRMA_MSG_MIGRATE

v1->v2:
 - move curleft cloning to a separate patch

Fixes: af2f464e ("xfrm: Assign esn pointers when cloning a state")
Signed-off-by: NAntony Antony <antony.antony@secunet.com>
Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/net/xfrm.h

@@ -1881,21 +1881,17 @@ static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_es
 static inline int xfrm_replay_clone(struct xfrm_state *x,
 				     struct xfrm_state *orig)
 {
-	x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
+
+	x->replay_esn = kmemdup(orig->replay_esn,
+				xfrm_replay_state_esn_len(orig->replay_esn),
 				GFP_KERNEL);
 	if (!x->replay_esn)
 		return -ENOMEM;
-
-	x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
-	x->replay_esn->replay_window = orig->replay_esn->replay_window;
-
-	x->preplay_esn = kmemdup(x->replay_esn,
-				 xfrm_replay_state_esn_len(x->replay_esn),
+	x->preplay_esn = kmemdup(orig->preplay_esn,
+				 xfrm_replay_state_esn_len(orig->preplay_esn),
 				 GFP_KERNEL);
-	if (!x->preplay_esn) {
-		kfree(x->replay_esn);
+	if (!x->preplay_esn)
 		return -ENOMEM;
-	}
 
 	return 0;
 }