centosplus patch [RHBZ#1780470]

centos-linux-4.18-xfrm_fix_memleak.patch

From d32c9130a47f5aa187e3167def2477e13569940d Mon Sep 17 00:00:00 2001

From: Steffen Klassert <steffen.klassert@secunet.com>

Date: Wed, 11 Dec 2019 15:15:06 -0800

Subject: [PATCH] xfrm: Fix memleak on xfrm state destroy

commit 86c6739eda7d2a03f2db30cbee67a5fb81afa8ba upstream.

We leak the page that we use to create skb page fragments

when destroying the xfrm_state. Fix this by dropping a

page reference if a page was assigned to the xfrm_state.

Fixes: cac2661c53f3 ("esp4: Avoid skb_cow_data whenever possible")

Reported-by: JD <jdtxs00@gmail.com>

Reported-by: Paul Wouters <paul@nohats.ca>

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Applied-by: Akemi Yagi <toracat@centos.org>

---

 net/xfrm/xfrm_state.c | 2 ++

 1 file changed, 2 insertions(+)

--- a/net/xfrm/xfrm_state.c

+++ b/net/xfrm/xfrm_state.c

@@ -456,6 +456,8 @@ static void ___xfrm_state_destroy(struct xfrm_state *x)

 		x->type->destructor(x);

 		xfrm_put_type(x->type);

 	}

+	if (x->xfrag.page)

+		put_page(x->xfrag.page);

 	xfrm_dev_state_free(x);

 	security_xfrm_state_free(x);

 	xfrm_state_free(x);

-- 

2.20.1