From: Gaurav Singh <gaurav1086@gmail.com>
To: gaurav1086@gmail.com, Jamal Hadi Salim <jhs@mojatatu.com>,
Cong Wang <xiyou.wangcong@gmail.com>,
Jiri Pirko <jiri@resnulli.us>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org (open list:TC subsystem),
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] [net/sched] Fix null pointer deref skb in tc_ctl_action
Date: Wed, 17 Jun 2020 21:43:28 -0400 [thread overview]
Message-ID: <20200618014328.28668-1-gaurav1086@gmail.com> (raw)
Add null check for skb
Signed-off-by: Gaurav Singh <gaurav1086@gmail.com>
---
net/sched/act_api.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 8ac7eb0a8309..fd584821d75a 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1473,9 +1473,12 @@ static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
struct netlink_ext_ack *extack)
{
+ if (!skb)
+ return 0;
+
struct net *net = sock_net(skb->sk);
struct nlattr *tca[TCA_ROOT_MAX + 1];
- u32 portid = skb ? NETLINK_CB(skb).portid : 0;
+ u32 portid = NETLINK_CB(skb).portid;
int ret = 0, ovr = 0;
if ((n->nlmsg_type != RTM_GETACTION) &&
--
2.17.1
next reply other threads:[~2020-06-18 1:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-18 1:43 Gaurav Singh [this message]
2020-06-18 3:43 ` [PATCH] [net/sched] Fix null pointer deref skb in tc_ctl_action Eric Dumazet
2020-06-18 14:54 ` David Miller
2020-06-19 18:39 ` kernel test robot
2020-06-19 19:24 ` [PATCH] [net/sched] Remove redundant skb null check Gaurav Singh
2020-06-21 4:30 ` David Miller
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