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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2024-06-04 09:52:36 -0700 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-06-06 12:57:15 +0200 |
| commit | b0632e53e0da8054e36bc973f0eec69d30f1b7c6 (patch) | |
| tree | 55f9a3cbd54faf873a66fd7b5f973ce927433a98 /net | |
| parent | 0aa3be7b3e1f8f997312cc4705f8165e02806f8f (diff) | |
| download | linux-b0632e53e0da8054e36bc973f0eec69d30f1b7c6.tar.gz linux-b0632e53e0da8054e36bc973f0eec69d30f1b7c6.tar.bz2 linux-b0632e53e0da8054e36bc973f0eec69d30f1b7c6.zip | |
af_unix: Annotate data-races around sk->sk_sndbuf.
sk_setsockopt() changes sk->sk_sndbuf under lock_sock(), but it's
not used in af_unix.c.
Let's use READ_ONCE() to read sk->sk_sndbuf in unix_writable(),
unix_dgram_sendmsg(), and unix_stream_sendmsg().
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/unix/af_unix.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index e7b74207aa3b..de2a5e334a88 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -533,7 +533,7 @@ static int unix_dgram_peer_wake_me(struct sock *sk, struct sock *other) static int unix_writable(const struct sock *sk, unsigned char state) { return state != TCP_LISTEN && - (refcount_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; + (refcount_read(&sk->sk_wmem_alloc) << 2) <= READ_ONCE(sk->sk_sndbuf); } static void unix_write_space(struct sock *sk) @@ -1967,7 +1967,7 @@ static int unix_dgram_sendmsg(struct socket *sock, struct msghdr *msg, } err = -EMSGSIZE; - if (len > sk->sk_sndbuf - 32) + if (len > READ_ONCE(sk->sk_sndbuf) - 32) goto out; if (len > SKB_MAX_ALLOC) { @@ -2247,7 +2247,7 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, &err, 0); } else { /* Keep two messages in the pipe so it schedules better */ - size = min_t(int, size, (sk->sk_sndbuf >> 1) - 64); + size = min_t(int, size, (READ_ONCE(sk->sk_sndbuf) >> 1) - 64); /* allow fallback to order-0 allocations */ size = min_t(int, size, SKB_MAX_HEAD(0) + UNIX_SKB_FRAGS_SZ); |