linux-kernel - [PATCH 4.19 276/321] xfrm: Fix memleak on xfrm state destroy

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Message-Id: <20191203223441.485499204@linuxfoundation.org>
Date:   Tue,  3 Dec 2019 23:35:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, JD <jdtxs00@...il.com>,
        Paul Wouters <paul@...ats.ca>,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: [PATCH 4.19 276/321] xfrm: Fix memleak on xfrm state destroy

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

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@...il.com>
Reported-by: Paul Wouters <paul@...ats.ca>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
 		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);