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| author | Eric Dumazet <edumazet@google.com> | 2025-02-05 15:51:10 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 14:01:40 +0100 |
| commit | cb4d7fbc937e37b99082fc76945ae1d4d98435ab (patch) | |
| tree | 9e78234e1455189db2e8b35ac0956341de35b31e /include/net | |
| parent | 56e6976793c0fcf1638aa534242408ab4e4ca705 (diff) | |
| download | linux-cb4d7fbc937e37b99082fc76945ae1d4d98435ab.tar.gz linux-cb4d7fbc937e37b99082fc76945ae1d4d98435ab.tar.bz2 linux-cb4d7fbc937e37b99082fc76945ae1d4d98435ab.zip | |
ipv4: add RCU protection to ip4_dst_hoplimit()
[ Upstream commit 469308552ca4560176cfc100e7ca84add1bebd7c ]
ip4_dst_hoplimit() must use RCU protection to make
sure the net structure it reads does not disappear.
Fixes: fa50d974d104 ("ipv4: Namespaceify ip_default_ttl sysctl knob")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250205155120.1676781-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/route.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/net/route.h b/include/net/route.h index 1789f1e6640b..da34b6fa9862 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -363,10 +363,15 @@ static inline int inet_iif(const struct sk_buff *skb) static inline int ip4_dst_hoplimit(const struct dst_entry *dst) { int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); - struct net *net = dev_net(dst->dev); - if (hoplimit == 0) + if (hoplimit == 0) { + const struct net *net; + + rcu_read_lock(); + net = dev_net_rcu(dst->dev); hoplimit = READ_ONCE(net->ipv4.sysctl_ip_default_ttl); + rcu_read_unlock(); + } return hoplimit; } |