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| author | Eric Dumazet <edumazet@google.com> | 2025-02-05 15:51:13 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 14:01:41 +0100 |
| commit | 77096420be1fb6a0fda2cdb49847dd984eb5ca62 (patch) | |
| tree | f4c26eb6b64912d3ca9ffd99aa7c443e0c8d8d40 /net | |
| parent | f4ba5e65c92b768ba542353fda2ec8c2ff3faaee (diff) | |
| download | linux-77096420be1fb6a0fda2cdb49847dd984eb5ca62.tar.gz linux-77096420be1fb6a0fda2cdb49847dd984eb5ca62.tar.bz2 linux-77096420be1fb6a0fda2cdb49847dd984eb5ca62.zip | |
ipv4: use RCU protection in rt_is_expired()
[ Upstream commit dd205fcc33d92d54eee4d7f21bb073af9bd5ce2b ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -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 9709ec3e2dce..e31aa5a74ace 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) |