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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-13 13:51:51 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-07-15 11:49:55 +0100 |
| commit | 8281b7ec5c56b71cb2cc5a1728b41607be66959c (patch) | |
| tree | 1c9563f175e6e4528ca2f2d33256c18efca097bb /include/net/route.h | |
| parent | db886979683a8360ced9b24ab1125ad0c4d2cf76 (diff) | |
| download | lwn-8281b7ec5c56b71cb2cc5a1728b41607be66959c.tar.gz lwn-8281b7ec5c56b71cb2cc5a1728b41607be66959c.zip | |
ip: Fix data-races around sysctl_ip_default_ttl.
While reading sysctl_ip_default_ttl, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its readers.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/route.h')
| -rw-r--r-- | include/net/route.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/route.h b/include/net/route.h index 991a3985712d..bbcf2aba149f 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -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; } |