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| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-06-30 13:07:58 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-01 07:39:07 -0700 |
| commit | 633547973ffc32fd2c815639d4675e1531f0896f (patch) | |
| tree | 751ca7a379366af93f578d9f35f48339d4d2dd9b /net/netlink | |
| parent | 53869cebce4bc53f71a080e7830600d4ae1ab712 (diff) | |
| download | linux-stable-633547973ffc32fd2c815639d4675e1531f0896f.tar.gz linux-stable-633547973ffc32fd2c815639d4675e1531f0896f.tar.bz2 linux-stable-633547973ffc32fd2c815639d4675e1531f0896f.zip | |
net: convert sk_buff.users from atomic_t to refcount_t
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 <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink')
| -rw-r--r-- | net/netlink/af_netlink.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index a88745e4b7df..05030ad1a36c 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -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; } |