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ip: Fix data-races around sysctl_ip_default_ttl.

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While reading sysctl_ip_default_ttl, 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 <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kuniyuki Iwashima
2022-07-13 13:51:51 -07:00
committed by David S. Miller
parent db88697968
commit 8281b7ec5c
6 changed files with 7 additions and 7 deletions
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2
include/net/route.h
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@@ -373,7 +373,7 @@ static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
struct net *net = dev_net(dst->dev);
if (hoplimit == 0)
hoplimit = net->ipv4.sysctl_ip_default_ttl;
hoplimit = READ_ONCE(net->ipv4.sysctl_ip_default_ttl);
return hoplimit;
}