diff options
| author | Xin Long <lucien.xin@gmail.com> | 2021-03-19 06:52:41 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-19 21:34:49 +0300 |
| commit | 8ff0b1f08ea73e5c08f5addd23481e76a60e741c (patch) | |
| tree | c5958fb0a79dacfa5aa9218f07723befa2189771 /net | |
| parent | c79a707072fe3fea0e3c92edee6ca85c1e53c29f (diff) | |
| download | linux-8ff0b1f08ea73e5c08f5addd23481e76a60e741c.tar.xz | |
sctp: move sk_route_caps check and set into sctp_outq_flush_transports
The sk's sk_route_caps is set in sctp_packet_config, and later it
only needs to change when traversing the transport_list in a loop,
as the dst might be changed in the tx path.
So move sk_route_caps check and set into sctp_outq_flush_transports
from sctp_packet_transmit. This also fixes a dst leak reported by
Chen Yi:
https://bugzilla.kernel.org/show_bug.cgi?id=212227
As calling sk_setup_caps() in sctp_packet_transmit may also set the
sk_route_caps for the ctrl sock in a netns. When the netns is being
deleted, the ctrl sock's releasing is later than dst dev's deleting,
which will cause this dev's deleting to hang and dmesg error occurs:
unregister_netdevice: waiting for xxx to become free. Usage count = 1
Reported-by: Chen Yi <yiche@redhat.com>
Fixes: bcd623d8e9fa ("sctp: call sk_setup_caps in sctp_packet_transmit instead")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sctp/output.c | 7 | ||||
| -rw-r--r-- | net/sctp/outqueue.c | 7 |
2 files changed, 7 insertions, 7 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c index 6614c9fdc51e..a6aa17df09ef 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -584,13 +584,6 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp) goto out; } - rcu_read_lock(); - if (__sk_dst_get(sk) != tp->dst) { - dst_hold(tp->dst); - sk_setup_caps(sk, tp->dst); - } - rcu_read_unlock(); - /* pack up chunks */ pkt_count = sctp_packet_pack(packet, head, gso, gfp); if (!pkt_count) { diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c index 3fd06a27105d..5cb1aa5f067b 100644 --- a/net/sctp/outqueue.c +++ b/net/sctp/outqueue.c @@ -1135,6 +1135,7 @@ static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx, static void sctp_outq_flush_transports(struct sctp_flush_ctx *ctx) { + struct sock *sk = ctx->asoc->base.sk; struct list_head *ltransport; struct sctp_packet *packet; struct sctp_transport *t; @@ -1144,6 +1145,12 @@ static void sctp_outq_flush_transports(struct sctp_flush_ctx *ctx) t = list_entry(ltransport, struct sctp_transport, send_ready); packet = &t->packet; if (!sctp_packet_empty(packet)) { + rcu_read_lock(); + if (t->dst && __sk_dst_get(sk) != t->dst) { + dst_hold(t->dst); + sk_setup_caps(sk, t->dst); + } + rcu_read_unlock(); error = sctp_packet_transmit(packet, ctx->gfp); if (error < 0) ctx->q->asoc->base.sk->sk_err = -error; |