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ip: Fix data-races around sysctl_ip_no_pmtu_disc.

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[ Upstream commit 0968d2a441bf6afb551fd99e60fa65ed67068963 ]

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

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Kuniyuki Iwashima 2022-07-13 13:51:52 -07:00 • committed by Greg Kroah-Hartman
commit 5af6d92263
4 changed files with 4 additions and 4 deletions
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2
net/ipv6/af_inet6.c
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@ -222,7 +222,7 @@ lookup_protocol:
inet->mc_list = NULL;
inet->rcv_tos = 0;
if (net->ipv4.sysctl_ip_no_pmtu_disc)
if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
inet->pmtudisc = IP_PMTUDISC_DONT;
else
inet->pmtudisc = IP_PMTUDISC_WANT;