[PATCH AUTOSEL 4.14 03/21] xfrm: Fix memleak on xfrm state destroy

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

[ Upstream commit 86c6739eda7d2a03f2db30cbee67a5fb81afa8ba ]

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 <redacted>
Reported-by: Paul Wouters <redacted>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/xfrm/xfrm_state.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index bd16e6882017e..190ca59d5ba31 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c

@@ -449,6 +449,8 @@ static void xfrm_state_gc_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);
 	kfree(x);

-- 
2.20.1