linux-kernel - [PATCH AUTOSEL 4.19 03/25] xfrm: Fix memleak on xfrm state destroy

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Message-Id: <20191122194859.24508-3-sashal@kernel.org>
Date:   Fri, 22 Nov 2019 14:48:36 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        JD <jdtxs00@...il.com>, Paul Wouters <paul@...ats.ca>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 03/25] xfrm: Fix memleak on xfrm state destroy

From: Steffen Klassert <steffen.klassert@...unet.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 <jdtxs00@...il.com>
Reported-by: Paul Wouters <paul@...ats.ca>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 11e09eb138d60..47a8ff972a2bf 100644
--- 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