xfrm: Fix memleak on xfrm state destroy

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>

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index c6f3c4a..f342356 100644 (file)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -495,6 +495,8 @@ 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);