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>
int len = NLMSG_ALIGN(sizeof(*up));
struct nlmsghdr *nlh;
struct sk_buff *skb;
+ int err;
skb = nlmsg_new(len, GFP_ATOMIC);
if (skb == NULL)
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,