Messages in this thread | | | Date | Thu, 31 Oct 2019 08:09:58 -0400 | From | Sasha Levin <> | Subject | Re: [PATCH 4.14 024/119] sctp: change sctp_prot .no_autobind with true |
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On Thu, Oct 31, 2019 at 05:14:15PM +0800, Xin Long wrote: >On Thu, Oct 31, 2019 at 3:54 PM Rantala, Tommi T. (Nokia - FI/Espoo) ><tommi.t.rantala@nokia.com> wrote: >> >> On Sun, 2019-10-27 at 22:00 +0100, Greg Kroah-Hartman wrote: >> > From: Xin Long <lucien.xin@gmail.com> >> > >> > [ Upstream commit 63dfb7938b13fa2c2fbcb45f34d065769eb09414 ] >> > >> > syzbot reported a memory leak: >> > >> > BUG: memory leak, unreferenced object 0xffff888120b3d380 (size 64): >> > backtrace: >> > >> > [...] slab_alloc mm/slab.c:3319 [inline] >> > [...] kmem_cache_alloc+0x13f/0x2c0 mm/slab.c:3483 >> > [...] sctp_bucket_create net/sctp/socket.c:8523 [inline] >> > [...] sctp_get_port_local+0x189/0x5a0 net/sctp/socket.c:8270 >> > [...] sctp_do_bind+0xcc/0x200 net/sctp/socket.c:402 >> > [...] sctp_bindx_add+0x4b/0xd0 net/sctp/socket.c:497 >> > [...] sctp_setsockopt_bindx+0x156/0x1b0 net/sctp/socket.c:1022 >> > [...] sctp_setsockopt net/sctp/socket.c:4641 [inline] >> > [...] sctp_setsockopt+0xaea/0x2dc0 net/sctp/socket.c:4611 >> > [...] sock_common_setsockopt+0x38/0x50 net/core/sock.c:3147 >> > [...] __sys_setsockopt+0x10f/0x220 net/socket.c:2084 >> > [...] __do_sys_setsockopt net/socket.c:2100 [inline] >> > >> > It was caused by when sending msgs without binding a port, in the path: >> > inet_sendmsg() -> inet_send_prepare() -> inet_autobind() -> >> > .get_port/sctp_get_port(), sp->bind_hash will be set while bp->port is >> > not. Later when binding another port by sctp_setsockopt_bindx(), a new >> > bucket will be created as bp->port is not set. >> > >> > sctp's autobind is supposed to call sctp_autobind() where it does all >> > things including setting bp->port. Since sctp_autobind() is called in >> > sctp_sendmsg() if the sk is not yet bound, it should have skipped the >> > auto bind. >> > >> > THis patch is to avoid calling inet_autobind() in inet_send_prepare() >> > by changing sctp_prot .no_autobind with true, also remove the unused >> > .get_port. >> >> Hi, >> >> I'm seeing SCTP oops in 4.14.151, reproducible easily with iperf: >> >> # iperf3 -s -1 & >> # iperf3 -c localhost --sctp >> >> This patch was also included in 4.19.81, but there it seems to be working >> fine. >> >> Any ideas if this patch is valid for 4.14, or what's missing in 4.14 to >> make this work? >pls get this commit into 4.14, which has been in 4.19: > >commit 644fbdeacf1d3edd366e44b8ba214de9d1dd66a9 >Author: Xin Long <lucien.xin@gmail.com> >Date: Sun May 20 16:39:10 2018 +0800 > > sctp: fix the issue that flags are ignored when using kernel_connect
Care to send a backport?
-- Thanks, Sasha
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