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authorEric Dumazet <edumazet@google.com>2016-04-06 22:07:34 -0700
committerDavid S. Miller <davem@davemloft.net>2016-04-07 12:02:33 -0400
commit8501786929de4616b10b8059ad97abd304a7dddf (patch)
treea523430f65bfddf7b2988d8cee3c08f23f2c5e68 /net
parentMerge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue (diff)
downloadlinux-dev-8501786929de4616b10b8059ad97abd304a7dddf.tar.xz
linux-dev-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>
Diffstat (limited to '')
-rw-r--r--net/ipv4/inet_connection_sock.c3
-rw-r--r--net/ipv4/inet_hashtables.c3
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) &&