4.19-stable review patch. If anyone has any objections, please let me know.
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From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit e4bd881d987121dbf1a288641491955a53d9f8f7 ]
When (AF_UNIX, SOCK_STREAM) socket connect()s to a listening socket, the listener's sk_peer_pid/sk_peer_cred are copied to the client in copy_peercred().
Then, the client's sk_peer_pid and sk_peer_cred are always NULL, so we need not call put_pid() and put_cred() there.
Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/unix/af_unix.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index dfcafbb8cd0e..24fb6f00f597 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -610,9 +610,6 @@ static void init_peercred(struct sock *sk)
static void copy_peercred(struct sock *sk, struct sock *peersk) { - const struct cred *old_cred; - struct pid *old_pid; - if (sk < peersk) { spin_lock(&sk->sk_peer_lock); spin_lock_nested(&peersk->sk_peer_lock, SINGLE_DEPTH_NESTING); @@ -620,16 +617,12 @@ static void copy_peercred(struct sock *sk, struct sock *peersk) spin_lock(&peersk->sk_peer_lock); spin_lock_nested(&sk->sk_peer_lock, SINGLE_DEPTH_NESTING); } - old_pid = sk->sk_peer_pid; - old_cred = sk->sk_peer_cred; + sk->sk_peer_pid = get_pid(peersk->sk_peer_pid); sk->sk_peer_cred = get_cred(peersk->sk_peer_cred);
spin_unlock(&sk->sk_peer_lock); spin_unlock(&peersk->sk_peer_lock); - - put_pid(old_pid); - put_cred(old_cred); }
static int unix_listen(struct socket *sock, int backlog)