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    Subject[PATCH 5.16 0881/1039] xfrm: fix dflt policy check when there is no policy configured
    Date
    From: Nicolas Dichtel <nicolas.dichtel@6wind.com>

    commit ec3bb890817e4398f2d46e12e2e205495b116be9 upstream.

    When there is no policy configured on the system, the default policy is
    checked in xfrm_route_forward. However, it was done with the wrong
    direction (XFRM_POLICY_FWD instead of XFRM_POLICY_OUT).
    The default policy for XFRM_POLICY_FWD was checked just before, with a call
    to xfrm[46]_policy_check().

    CC: stable@vger.kernel.org
    Fixes: 2d151d39073a ("xfrm: Add possibility to set the default to block if we have no policy")
    Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
    Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/net/xfrm.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/include/net/xfrm.h
    +++ b/include/net/xfrm.h
    @@ -1167,7 +1167,7 @@ static inline int xfrm_route_forward(str
    {
    struct net *net = dev_net(skb->dev);

    - if (xfrm_default_allow(net, XFRM_POLICY_FWD))
    + if (xfrm_default_allow(net, XFRM_POLICY_OUT))
    return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
    (skb_dst(skb)->flags & DST_NOXFRM) ||
    __xfrm_route_forward(skb, family);

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