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Revert "xfrm: Fix stack-out-of-bounds read in xfrm_state_find."

This reverts commit c9f3f81.

This commit breaks transport mode when the policy template
has widlcard addresses configured, so revert it.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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Steffen Klassert
Steffen Klassert committed Nov 15, 2017
1 parent 0e74aa1 commit 94802151894d482e82c324edf2c658f8e6b96508
Showing with 18 additions and 11 deletions.
  1. +18 −11 net/xfrm/xfrm_policy.c
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@@ -1362,29 +1362,36 @@ xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
struct net *net = xp_net(policy);
int nx;
int i, error;
xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
xfrm_address_t tmp;
for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
struct xfrm_state *x;
xfrm_address_t *local;
xfrm_address_t *remote;
xfrm_address_t *remote = daddr;
xfrm_address_t *local = saddr;
struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
remote = &tmpl->id.daddr;
local = &tmpl->saddr;
if (xfrm_addr_any(local, tmpl->encap_family)) {
error = xfrm_get_saddr(net, fl->flowi_oif,
&tmp, remote,
tmpl->encap_family, 0);
if (error)
goto fail;
local = &tmp;
if (tmpl->mode == XFRM_MODE_TUNNEL ||
tmpl->mode == XFRM_MODE_BEET) {
remote = &tmpl->id.daddr;
local = &tmpl->saddr;
if (xfrm_addr_any(local, tmpl->encap_family)) {
error = xfrm_get_saddr(net, fl->flowi_oif,
&tmp, remote,
tmpl->encap_family, 0);
if (error)
goto fail;
local = &tmp;
}
}
x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
if (x && x->km.state == XFRM_STATE_VALID) {
xfrm[nx++] = x;
daddr = remote;
saddr = local;
continue;
}
if (x) {

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