diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-07-28 15:03:08 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-07-29 18:13:40 +0100 |
| commit | fe11fdcb4207907d80cda2e73777465d68131e66 (patch) | |
| tree | c00837ede0a87f094f944719cdca62b9cacc4bc8 /net/core/sock.c | |
| parent | 7938cd15436873f649f31cb867bac2d88ca564d0 (diff) | |
net: annotate data-races around sk->sk_reserved_mem
sk_getsockopt() runs locklessly. This means sk->sk_reserved_mem
can be read while other threads are changing its value.
Add missing annotations where they are needed.
Fixes: 2bb2f5fb21b0 ("net: add new socket option SO_RESERVE_MEM")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/sock.c')
| -rw-r--r-- | net/core/sock.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 9370fd50aa2c..bd201d15e72a 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1007,7 +1007,7 @@ static void sock_release_reserved_memory(struct sock *sk, int bytes) bytes = round_down(bytes, PAGE_SIZE); WARN_ON(bytes > sk->sk_reserved_mem); - sk->sk_reserved_mem -= bytes; + WRITE_ONCE(sk->sk_reserved_mem, sk->sk_reserved_mem - bytes); sk_mem_reclaim(sk); } @@ -1044,7 +1044,8 @@ static int sock_reserve_memory(struct sock *sk, int bytes) } sk->sk_forward_alloc += pages << PAGE_SHIFT; - sk->sk_reserved_mem += pages << PAGE_SHIFT; + WRITE_ONCE(sk->sk_reserved_mem, + sk->sk_reserved_mem + (pages << PAGE_SHIFT)); return 0; } @@ -1973,7 +1974,7 @@ int sk_getsockopt(struct sock *sk, int level, int optname, break; case SO_RESERVE_MEM: - v.val = sk->sk_reserved_mem; + v.val = READ_ONCE(sk->sk_reserved_mem); break; case SO_TXREHASH: |