diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-18 10:26:53 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-29 17:10:34 +0200 |
| commit | 5e38cee24f19d19280c68f1ac8bf6790d607f60a (patch) | |
| tree | d66d43aa13df4f03aa6da9060e0ece07c88a8dcc /net | |
| parent | f7b3610619ec123f36b14bacad540d59a5a76526 (diff) | |
| download | linux-stable-5e38cee24f19d19280c68f1ac8bf6790d607f60a.tar.gz linux-stable-5e38cee24f19d19280c68f1ac8bf6790d607f60a.tar.bz2 linux-stable-5e38cee24f19d19280c68f1ac8bf6790d607f60a.zip | |
tcp: Fix data-races around sysctl_tcp_max_reordering.
[ Upstream commit a11e5b3e7a59fde1a90b0eaeaa82320495cf8cae ]
While reading sysctl_tcp_max_reordering, it can be changed
concurrently. Thus, we need to add READ_ONCE() to its readers.
Fixes: dca145ffaa8d ("tcp: allow for bigger reordering level")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_input.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 3b63e05c3486..26f0994da31b 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -893,7 +893,7 @@ static void tcp_check_sack_reordering(struct sock *sk, const u32 low_seq, tp->undo_marker ? tp->undo_retrans : 0); #endif tp->reordering = min_t(u32, (metric + mss - 1) / mss, - sock_net(sk)->ipv4.sysctl_tcp_max_reordering); + READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_max_reordering)); } /* This exciting event is worth to be remembered. 8) */ @@ -1878,7 +1878,7 @@ static void tcp_check_reno_reordering(struct sock *sk, const int addend) return; tp->reordering = min_t(u32, tp->packets_out + addend, - sock_net(sk)->ipv4.sysctl_tcp_max_reordering); + READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_max_reordering)); tp->reord_seen++; NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRENOREORDER); } |