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Merge branch 'tcf_foo_init-NULL-deref'

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Davide Caratti says:

====================
net/sched: fix NULL dereference in the error path of .init()

with several TC actions it's possible to see NULL pointer dereference,
when the .init() function calls tcf_idr_alloc(), fails at some point and
then calls tcf_idr_release(): this series fixes all them introducing
non-NULL tests in the .cleanup() function.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-03-17 19:53:29 -04:00
commit 78f1b04fa2
5 changed files with 13 additions and 8 deletions
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3
net/sched/act_csum.c
View file

@ -626,7 +626,8 @@ static void tcf_csum_cleanup(struct tc_action *a)
struct tcf_csum_params *params;
params = rcu_dereference_protected(p->params, 1);
kfree_rcu(params, rcu);
if (params)
kfree_rcu(params, rcu);
}
static int tcf_csum_walker(struct net *net, struct sk_buff *skb,

3
net/sched/act_sample.c
View file

@ -103,7 +103,8 @@ static void tcf_sample_cleanup(struct tc_action *a)
psample_group = rtnl_dereference(s->psample_group);
RCU_INIT_POINTER(s->psample_group, NULL);
psample_group_put(psample_group);
if (psample_group)
psample_group_put(psample_group);
}
static bool tcf_sample_dev_ok_push(struct net_device *dev)

3
net/sched/act_skbmod.c
View file

@ -190,7 +190,8 @@ static void tcf_skbmod_cleanup(struct tc_action *a)
struct tcf_skbmod_params *p;
p = rcu_dereference_protected(d->skbmod_p, 1);
kfree_rcu(p, rcu);
if (p)
kfree_rcu(p, rcu);
}
static int tcf_skbmod_dump(struct sk_buff *skb, struct tc_action *a,

9
net/sched/act_tunnel_key.c
View file

@ -208,11 +208,12 @@ static void tunnel_key_release(struct tc_action *a)
struct tcf_tunnel_key_params *params;
params = rcu_dereference_protected(t->params, 1);
if (params) {
if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
dst_release(&params->tcft_enc_metadata->dst);
if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
dst_release(&params->tcft_enc_metadata->dst);
kfree_rcu(params, rcu);
kfree_rcu(params, rcu);
}
}
static int tunnel_key_dump_addresses(struct sk_buff *skb,

3
net/sched/act_vlan.c
View file

@ -225,7 +225,8 @@ static void tcf_vlan_cleanup(struct tc_action *a)
struct tcf_vlan_params *p;
p = rcu_dereference_protected(v->vlan_p, 1);
kfree_rcu(p, rcu);
if (p)
kfree_rcu(p, rcu);
}
static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,