diff options
| author | Eric Dumazet <edumazet@google.com> | 2025-02-05 15:51:13 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-02-06 16:14:14 -0800 |
| commit | dd205fcc33d92d54eee4d7f21bb073af9bd5ce2b (patch) | |
| tree | c14d5cb58d9b25c45ac73338cc75a9f4389713c9 | |
| parent | 71b8471c93fa0bcab911fcb65da1eb6c4f5f735f (diff) | |
ipv4: use RCU protection in rt_is_expired()
rt_is_expired() must use RCU protection to make
sure the net structure it reads does not disappear.
Fixes: e84f84f27647 ("netns: place rt_genid into struct net")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250205155120.1676781-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/ipv4/route.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 74c074f45758..e959327c0ba8 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -390,7 +390,13 @@ static inline int ip_rt_proc_init(void) static inline bool rt_is_expired(const struct rtable *rth) { - return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); + bool res; + + rcu_read_lock(); + res = rth->rt_genid != rt_genid_ipv4(dev_net_rcu(rth->dst.dev)); + rcu_read_unlock(); + + return res; } void rt_cache_flush(struct net *net) |