[PATCH 4.14 005/165] esp6: fix memleak on error path in esp6_input

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Zhen Lei <thunder.leiz...@huawei.com>

[ Upstream commit 7284fdf39a912322ce97de2d30def3c6068a418c ]

This ought to be an omission in e6194923237 ("esp: Fix memleaks on error
paths."). The memleak on error path in esp6_input is similar to esp_input
of esp4.

Fixes: e6194923237 ("esp: Fix memleaks on error paths.")
Fixes: 3f29770723f ("ipsec: check return value of skb_to_sgvec always")
Signed-off-by: Zhen Lei <thunder.leiz...@huawei.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv6/esp6.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -651,8 +651,10 @@ skip_cow:
 
        sg_init_table(sg, nfrags);
        ret = skb_to_sgvec(skb, sg, 0, skb->len);
-       if (unlikely(ret < 0))
+       if (unlikely(ret < 0)) {
+               kfree(tmp);
                goto out;
+       }
 
        skb->ip_summed = CHECKSUM_NONE;