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net: convert sk_buff.users from atomic_t to refcount_t

Browse source 
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <[email protected]>
Signed-off-by: Hans Liljestrand <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David Windsor <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Reshetova, Elena 2017-06-30 13:07:58 +03:00 • committed by David S. Miller
commit 633547973f
21 changed files with 67 additions and 67 deletions
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6
net/netlink/af_netlink.c
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@ -1848,7 +1848,7 @@ static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
}
if (dst_group) {
atomic_inc(&skb->users);
refcount_inc(&skb->users);
netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL);
}
err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT);
@ -2226,7 +2226,7 @@ int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
struct netlink_sock *nlk;
int ret;
atomic_inc(&skb->users);
refcount_inc(&skb->users);
sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid);
if (sk == NULL) {
@ -2431,7 +2431,7 @@ int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
int exclude_portid = 0;
if (report) {
atomic_inc(&skb->users);
refcount_inc(&skb->users);
exclude_portid = portid;
}