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ip: Fix data-races around sysctl_ip_fwd_update_priority.

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[ Upstream commit 7bf9e18d9a5e99e3c83482973557e9f047b051e7 ]

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

Fixes: 432e05d328 ("net: ipv4: Control SKB reprioritization after forwarding")
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
2022-07-13 13:51:54 -07:00
committed by Greg Kroah-Hartman
parent b96ed5ccb0
commit 11038fa781
2 changed files with 3 additions and 2 deletions
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2
net/ipv4/ip_forward.c
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@@ -151,7 +151,7 @@ int ip_forward(struct sk_buff *skb)
!skb_sec_path(skb))
ip_rt_send_redirect(skb);
if (net->ipv4.sysctl_ip_fwd_update_priority)
if (READ_ONCE(net->ipv4.sysctl_ip_fwd_update_priority))
skb->priority = rt_tos2priority(iph->tos);
return NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,