| Message ID | 20201124162446.11448-1-fw@strlen.de |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [net-next] mptcp: put reference in mptcp timeout timer | expand |
On Tue, 2020-11-24 at 17:24 +0100, Florian Westphal wrote: > On close this timer might be scheduled. mptcp uses sk_reset_timer for > this, so the a reference on the mptcp socket is taken. > > This causes a refcount leak which can for example be reproduced > with 'mp_join_server_v4.pkt' from the mptcp-packetdrill repo. Whoops, my fault! > The leak has nothing to do with join requests, v1_mp_capable_bind_no_cs.pkt > works too when replacing the last ack mpcapable to v1 instead of v0. > > unreferenced object 0xffff888109bba040 (size 2744): > comm "packetdrill", [..] > backtrace: > [..] sk_prot_alloc.isra.0+0x2b/0xc0 > [..] sk_clone_lock+0x2f/0x740 > [..] mptcp_sk_clone+0x33/0x1a0 > [..] subflow_syn_recv_sock+0x2b1/0x690 [..] > > Fixes: e16163b6e2b7 ("mptcp: refactor shutdown and close") > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: Davide Caratti <dcaratti@redhat.com> > Signed-off-by: Florian Westphal <fw@strlen.de> > --- > net/mptcp/protocol.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c > index 4b7794835fea..dc979571f561 100644 > --- a/net/mptcp/protocol.c > +++ b/net/mptcp/protocol.c > @@ -1710,6 +1710,7 @@ static void mptcp_timeout_timer(struct timer_list *t) > struct sock *sk = from_timer(sk, t, sk_timer); > > mptcp_schedule_work(sk); > + sock_put(sk); > } > > /* Find an idle subflow. Return NULL if there is unacked data at tcp LGTM, thanks! Acked-by: Paolo Abeni <pabeni@redhat.com>
On Tue, 24 Nov 2020 17:42:21 +0100 Paolo Abeni wrote: > On Tue, 2020-11-24 at 17:24 +0100, Florian Westphal wrote: > > On close this timer might be scheduled. mptcp uses sk_reset_timer for > > this, so the a reference on the mptcp socket is taken. > > > > This causes a refcount leak which can for example be reproduced > > with 'mp_join_server_v4.pkt' from the mptcp-packetdrill repo. > > Whoops, my fault! > > > The leak has nothing to do with join requests, v1_mp_capable_bind_no_cs.pkt > > works too when replacing the last ack mpcapable to v1 instead of v0. > > > > unreferenced object 0xffff888109bba040 (size 2744): > > comm "packetdrill", [..] > > backtrace: > > [..] sk_prot_alloc.isra.0+0x2b/0xc0 > > [..] sk_clone_lock+0x2f/0x740 > > [..] mptcp_sk_clone+0x33/0x1a0 > > [..] subflow_syn_recv_sock+0x2b1/0x690 [..] > > > > Fixes: e16163b6e2b7 ("mptcp: refactor shutdown and close") > > Cc: Paolo Abeni <pabeni@redhat.com> > > Cc: Davide Caratti <dcaratti@redhat.com> > > Signed-off-by: Florian Westphal <fw@strlen.de> > > --- > > net/mptcp/protocol.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c > > index 4b7794835fea..dc979571f561 100644 > > --- a/net/mptcp/protocol.c > > +++ b/net/mptcp/protocol.c > > @@ -1710,6 +1710,7 @@ static void mptcp_timeout_timer(struct timer_list *t) > > struct sock *sk = from_timer(sk, t, sk_timer); > > > > mptcp_schedule_work(sk); > > + sock_put(sk); > > } > > > > /* Find an idle subflow. Return NULL if there is unacked data at tcp > > LGTM, thanks! > Acked-by: Paolo Abeni <pabeni@redhat.com> Applied, thanks!
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 4b7794835fea..dc979571f561 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1710,6 +1710,7 @@ static void mptcp_timeout_timer(struct timer_list *t) struct sock *sk = from_timer(sk, t, sk_timer); mptcp_schedule_work(sk); + sock_put(sk); } /* Find an idle subflow. Return NULL if there is unacked data at tcp
On close this timer might be scheduled. mptcp uses sk_reset_timer for this, so the a reference on the mptcp socket is taken. This causes a refcount leak which can for example be reproduced with 'mp_join_server_v4.pkt' from the mptcp-packetdrill repo. The leak has nothing to do with join requests, v1_mp_capable_bind_no_cs.pkt works too when replacing the last ack mpcapable to v1 instead of v0. unreferenced object 0xffff888109bba040 (size 2744): comm "packetdrill", [..] backtrace: [..] sk_prot_alloc.isra.0+0x2b/0xc0 [..] sk_clone_lock+0x2f/0x740 [..] mptcp_sk_clone+0x33/0x1a0 [..] subflow_syn_recv_sock+0x2b1/0x690 [..] Fixes: e16163b6e2b7 ("mptcp: refactor shutdown and close") Cc: Paolo Abeni <pabeni@redhat.com> Cc: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Florian Westphal <fw@strlen.de> --- net/mptcp/protocol.c | 1 + 1 file changed, 1 insertion(+)