From: Herbert Xu herbert@gondor.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@googlegroups.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin alexander.levin@verizon.com --- net/xfrm/xfrm_policy.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 253e7dda287b..fb84ff4aeee7 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1345,6 +1345,7 @@ 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)); write_lock_bh(&net->xfrm.xfrm_policy_lock);