From: Eric Dumazet edumazet@google.com
[ Upstream commit 11695c6e966b0ec7ed1d16777d294cef865a5c91 ]
sk_getsockopt() runs locklessly, thus we need to annotate the read of sk->sk_peek_off.
While we are at it, add corresponding annotations to sk_set_peek_off() and unix_set_peek_off().
Fixes: b9bb53f3836f ("sock: convert sk_peek_offset functions to WRITE_ONCE") Signed-off-by: Eric Dumazet edumazet@google.com Cc: Willem de Bruijn willemb@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/sock.c | 4 ++-- net/unix/af_unix.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/net/core/sock.c b/net/core/sock.c index 59abfb2c92266..0cca1ccf14990 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1643,7 +1643,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname, if (!sock->ops->set_peek_off) return -EOPNOTSUPP;
- v.val = sk->sk_peek_off; + v.val = READ_ONCE(sk->sk_peek_off); break; case SO_NOFCS: v.val = sock_flag(sk, SOCK_NOFCS); @@ -2901,7 +2901,7 @@ EXPORT_SYMBOL(__sk_mem_reclaim);
int sk_set_peek_off(struct sock *sk, int val) { - sk->sk_peek_off = val; + WRITE_ONCE(sk->sk_peek_off, val); return 0; } EXPORT_SYMBOL_GPL(sk_set_peek_off); diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index d326540e4938c..7a076d5017d1c 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -717,7 +717,7 @@ static int unix_set_peek_off(struct sock *sk, int val) if (mutex_lock_interruptible(&u->iolock)) return -EINTR;
- sk->sk_peek_off = val; + WRITE_ONCE(sk->sk_peek_off, val); mutex_unlock(&u->iolock);
return 0;