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tcp: Fix a data-race around sysctl_tcp_retrans_collapse. 

[ Upstream commit 1a63cb91f0 ]

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 68b6f95067
commit d316488be1
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_output.c
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@ -3103,7 +3103,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *to,
struct sk_buff *skb = to, *tmp;
bool first = true;
if (!sock_net(sk)->ipv4.sysctl_tcp_retrans_collapse)
if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_retrans_collapse))
return;
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)
return;