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tcp: Fix a data-race around sysctl_tcp_retrans_collapse.

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[ Upstream commit 1a63cb91f0c2fcdeced6d6edee8d1d886583d139 ]

While reading sysctl_tcp_retrans_collapse, 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
2022-07-18 10:26:49 -07:00
committed by Greg Kroah-Hartman
parent 0e3f82a03e
commit daa8b5b869
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_output.c
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@@ -3100,7 +3100,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *to,
struct sk_buff *skb = to, *tmp; struct sk_buff *skb = to, *tmp;
bool first = true; bool first = true;
if (!sock_net(sk)->ipv4.sysctl_tcp_retrans_collapse) if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_retrans_collapse))
return; return;
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN) if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)
return; return;