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| author | Eric Dumazet <edumazet@google.com> | 2016-04-06 22:07:34 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-07 12:02:33 -0400 |
| commit | 8501786929de4616b10b8059ad97abd304a7dddf (patch) | |
| tree | a523430f65bfddf7b2988d8cee3c08f23f2c5e68 | |
| parent | 94ab1ea94c71b7ba3e835315d69880a8086d7ab1 (diff) | |
| download | linux-8501786929de4616b10b8059ad97abd304a7dddf.tar.gz linux-8501786929de4616b10b8059ad97abd304a7dddf.tar.bz2 linux-8501786929de4616b10b8059ad97abd304a7dddf.zip | |
tcp/dccp: fix inet_reuseport_add_sock()
David Ahern reported panics in __inet_hash() caused by my recent commit.
The reason is inet_reuseport_add_sock() was still using
sk_nulls_for_each_rcu() instead of sk_for_each_rcu().
SO_REUSEPORT enabled listeners were causing an instant crash.
While chasing this bug, I found that I forgot to clear SOCK_RCU_FREE
flag, as it is inherited from the parent at clone time.
Fixes: 3b24d854cb35 ("tcp/dccp: do not touch listener sk_refcnt under synflood")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: David Ahern <dsa@cumulusnetworks.com>
Tested-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/inet_connection_sock.c | 3 | ||||
| -rw-r--r-- | net/ipv4/inet_hashtables.c | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index bc5196ea1bdf..ab69da2d2a77 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -661,6 +661,9 @@ struct sock *inet_csk_clone_lock(const struct sock *sk, inet_sk(newsk)->inet_sport = htons(inet_rsk(req)->ir_num); newsk->sk_write_space = sk_stream_write_space; + /* listeners have SOCK_RCU_FREE, not the children */ + sock_reset_flag(newsk, SOCK_RCU_FREE); + newsk->sk_mark = inet_rsk(req)->ir_mark; atomic64_set(&newsk->sk_cookie, atomic64_read(&inet_rsk(req)->ir_cookie)); diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 98ba03b6f87d..fcadb670f50b 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -439,10 +439,9 @@ static int inet_reuseport_add_sock(struct sock *sk, bool match_wildcard)) { struct sock *sk2; - struct hlist_nulls_node *node; kuid_t uid = sock_i_uid(sk); - sk_nulls_for_each_rcu(sk2, node, &ilb->head) { + sk_for_each_rcu(sk2, &ilb->head) { if (sk2 != sk && sk2->sk_family == sk->sk_family && ipv6_only_sock(sk2) == ipv6_only_sock(sk) && |