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xfrm: fix rcu lock in xfrm_notify_userpolicy()

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As stated in the comment above xfrm_nlmsg_multicast(), rcu read lock must
be held before calling this function.

Reported-by: syzbot+3d9866419b4aa8f985d6@syzkaller.appspotmail.com
Fixes: 703b94b93c19 ("xfrm: notify default policy on update")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Nicolas Dichtel 2021-09-22 10:50:06 +02:00 committed by Steffen Klassert
parent 047a749d23
commit 93ec1320b0
1 changed files with 6 additions and 1 deletions
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7
net/xfrm/xfrm_user.c
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@ -1967,6 +1967,7 @@ static int xfrm_notify_userpolicy(struct net *net)
int len = NLMSG_ALIGN(sizeof(*up));
struct nlmsghdr *nlh;
struct sk_buff *skb;
int err;
skb = nlmsg_new(len, GFP_ATOMIC);
if (skb == NULL)
@ -1988,7 +1989,11 @@ static int xfrm_notify_userpolicy(struct net *net)
nlmsg_end(skb, nlh);
return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
rcu_read_lock();
err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
rcu_read_unlock();
return err;
}
static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,