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Commit 0e74aa1d authored by Herbert Xu's avatar Herbert Xu Committed by Steffen Klassert
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xfrm: Copy policy family in clone_policy 



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: default avatarsyzbot <syzkaller@googlegroups.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent b3954568

net/xfrm/xfrm_policy.c

+1 −0
Original line number Diff line number Diff line
@@ -1306,6 +1306,7 @@ static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) 
		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));

		spin_lock_bh(&net->xfrm.xfrm_policy_lock);