linux-kernel - [PATCH 4.4 087/105] xfrm: Copy policy family in clone

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Message-Id: <20171215092310.545245264@linuxfoundation.org>
Date:   Fri, 15 Dec 2017 10:45:25 +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, syzbot <syzkaller@...glegroups.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 087/105] xfrm: Copy policy family in clone_policy

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

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

From: Herbert Xu <herbert@...dor.apana.org.au>


[ Upstream commit 0e74aa1d79a5bbc663e03a2804399cae418a0321 ]

The syzbot found an ancient bug in the IPsec code.  When we cloned
a socket policy (for example, for a child TCP socket derived from a
listening socket), we did not copy the family field.  This results
in a live policy with a zero family field.  This triggers a BUG_ON
check in the af_key code when the cloned policy is retrieved.

This patch fixes it by copying the family field over.

Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
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_policy.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1361,6 +1361,7 @@ static struct xfrm_policy *clone_policy(
 		newp->xfrm_nr = old->xfrm_nr;
 		newp->index = old->index;
 		newp->type = old->type;
+		newp->family = old->family;
 		memcpy(newp->xfrm_vec, old->xfrm_vec,
 		       newp->xfrm_nr*sizeof(struct xfrm_tmpl));
 		write_lock_bh(&net->xfrm.xfrm_policy_lock);