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| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-06-30 13:08:01 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-01 07:39:08 -0700 |
| commit | 41c6d650f6537e55a1b53438c646fbc3f49176bf (patch) | |
| tree | d7fb3d5a2f1b3fb0fe76fa010141be563488d36b /net/netlink | |
| parent | 14afee4b6092fde451ee17604e5f5c89da33e71e (diff) | |
| download | linux-41c6d650f6537e55a1b53438c646fbc3f49176bf.tar.gz linux-41c6d650f6537e55a1b53438c646fbc3f49176bf.tar.bz2 linux-41c6d650f6537e55a1b53438c646fbc3f49176bf.zip | |
net: convert sock.sk_refcnt 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.
This patch uses refcount_inc_not_zero() instead of
atomic_inc_not_zero_hint() due to absense of a _hint()
version of refcount API. If the hint() version must
be used, we might need to revisit API.
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 8ced52e91181..5acee49db90b 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -575,7 +575,7 @@ static void netlink_remove(struct sock *sk) table = &nl_table[sk->sk_protocol]; if (!rhashtable_remove_fast(&table->hash, &nlk_sk(sk)->node, netlink_rhashtable_params)) { - WARN_ON(atomic_read(&sk->sk_refcnt) == 1); + WARN_ON(refcount_read(&sk->sk_refcnt) == 1); __sock_put(sk); } @@ -691,7 +691,7 @@ static void deferred_put_nlk_sk(struct rcu_head *head) struct netlink_sock *nlk = container_of(head, struct netlink_sock, rcu); struct sock *sk = &nlk->sk; - if (!atomic_dec_and_test(&sk->sk_refcnt)) + if (!refcount_dec_and_test(&sk->sk_refcnt)) return; if (nlk->cb_running && nlk->cb.done) { @@ -2568,7 +2568,7 @@ static int netlink_seq_show(struct seq_file *seq, void *v) sk_rmem_alloc_get(s), sk_wmem_alloc_get(s), nlk->cb_running, - atomic_read(&s->sk_refcnt), + refcount_read(&s->sk_refcnt), atomic_read(&s->sk_drops), sock_i_ino(s) ); |