linux-kernel - [PATCH 4.14 133/159] xfrm: Fix xfrm_input() to verify state is valid when (encap

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Date:   Fri, 23 Feb 2018 19:27:21 +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, Aviv Heller <avivh@...lanox.com>,
        Yevgeny Kliteynik <kliteyn@...lanox.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 133/159] xfrm: Fix xfrm_input() to verify state is valid when (encap_type < 0)

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aviv Heller <avivh@...lanox.com>


[ Upstream commit 4ce3dbe397d7b6b15f272ae757c78c35e9e4b61d ]

Code path when (encap_type < 0) does not verify the state is valid
before progressing.

This will result in a crash if, for instance, x->km.state ==
XFRM_STATE_ACQ.

Fixes: 7785bba299a8 ("esp: Add a software GRO codepath")
Signed-off-by: Aviv Heller <avivh@...lanox.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@...lanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/xfrm/xfrm_input.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -207,7 +207,7 @@ int xfrm_input(struct sk_buff *skb, int
 	xfrm_address_t *daddr;
 	struct xfrm_mode *inner_mode;
 	u32 mark = skb->mark;
-	unsigned int family;
+	unsigned int family = AF_UNSPEC;
 	int decaps = 0;
 	int async = 0;
 	bool xfrm_gro = false;
@@ -216,6 +216,16 @@ int xfrm_input(struct sk_buff *skb, int
 
 	if (encap_type < 0) {
 		x = xfrm_input_state(skb);
+
+		if (unlikely(x->km.state != XFRM_STATE_VALID)) {
+			if (x->km.state == XFRM_STATE_ACQ)
+				XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
+			else
+				XFRM_INC_STATS(net,
+					       LINUX_MIB_XFRMINSTATEINVALID);
+			goto drop;
+		}
+
 		family = x->outer_mode->afinfo->family;
 
 		/* An encap_type of -1 indicates async resumption. */