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net: Fix a data-race around sysctl_somaxconn. 

[ Upstream commit 3c9ba81d72 ]

While reading sysctl_somaxconn, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
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>
This commit is contained in:
Kuniyuki Iwashima 2022-08-23 10:47:00 -07:00 committed by Greg Kroah-Hartman
parent 8a53693520
commit 18a8b82643
1 changed files with 1 additions and 1 deletions
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2
net/socket.c
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@ -1801,7 +1801,7 @@ int __sys_listen(int fd, int backlog)
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock) {
somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
somaxconn = READ_ONCE(sock_net(sock->sk)->core.sysctl_somaxconn);
if ((unsigned int)backlog > somaxconn)
backlog = somaxconn;