Re: [PATCH net] net: sched: fix NULL pointer dereference when action calls some targets

As we know in some target's checkentry it may dereference par.entryinfo
to check entry stuff inside. But when sched action calls xt_check_target,
par.entryinfo is set with NULL. It would cause kernel panic when calling
some targets.

It can be reproduce with:
  # tc qd add dev eth1 ingress handle ffff:
  # tc filter add dev eth1 parent ffff: u32 match u32 0 0 action xt \
    -j ECN --ecn-tcp-remove

It could also crash kernel when using target CLUSTERIP or TPROXY.

By now there's no proper value for par.entryinfo in ipt_init_target,
but it can not be set with NULL. This patch is to void all these
panics by setting it with an ipt_entry obj with all members 0.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 net/sched/act_ipt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index 7c4816b..0f09f70 100644
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c

@@ -41,6 +41,7 @@ static int ipt_init_target(struct net *net, struct xt_entry_target *t,
 {
        struct xt_tgchk_param par;
        struct xt_target *target;
+       struct ipt_entry e;
        int ret = 0;

        target = xt_request_find_target(AF_INET, t->u.user.name,

@@ -48,10 +49,11 @@ static int ipt_init_target(struct net *net, struct xt_entry_target *t,
        if (IS_ERR(target))
                return PTR_ERR(target);

+       memset(&e, 0, sizeof(e));
        t->u.kernel.target = target;
        par.net       = net;
        par.table     = table;
-       par.entryinfo = NULL;
+       par.entryinfo = &e;