memory leak in sctp_packet

memory leak in sctp_packet_transmit
Status: upstream: reported C repro on 2020/07/22 20:32
Reported-by: syzbot+8bb053b5d63595ab47db@syzkaller.appspotmail.com
First crash: 551d, last: 200d

Patch testing requests:
Created	Duration	User	Repo	Result
2021/08/04 01:06	16m	phind.uet@gmail.com	linux-next	OK
2021/04/15 09:23	8m	phil@philpotter.co.uk	upstream	report log
2020/10/16 23:42	8m	anant.thazhemadam@gmail.com	upstream	report log

Sample crash report:

[[0;32m  OK  [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.234' (ECDSA) to the list of known hosts.
executing program
BUG: memory leak
unreferenced object 0xffff888113525400 (size 232):
  comm "syz-executor631", pid 8432, jiffies 4294942861 (age 8.140s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 40 b9 02 81 88 ff ff 40 98 d3 02 81 88 ff ff  .@......@.......
  backtrace:
    [<ffffffff836cedbf>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:414
    [<ffffffff83e3dc9e>] alloc_skb include/linux/skbuff.h:1112 [inline]
    [<ffffffff83e3dc9e>] sctp_packet_transmit+0xae/0xc50 net/sctp/output.c:594
    [<ffffffff83e21ec1>] sctp_outq_flush_transports+0x151/0x1c0 net/sctp/outqueue.c:1163
    [<ffffffff83e24b8f>] sctp_outq_flush net/sctp/outqueue.c:1211 [inline]
    [<ffffffff83e24b8f>] sctp_outq_uncork+0xaf/0xd0 net/sctp/outqueue.c:758
    [<ffffffff83e0bc72>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1812 [inline]
    [<ffffffff83e0bc72>] sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
    [<ffffffff83e0bc72>] sctp_do_sm+0x312/0x2260 net/sctp/sm_sideeffect.c:1166
    [<ffffffff83e12963>] sctp_assoc_bh_rcv+0x1e3/0x300 net/sctp/associola.c:1054
    [<ffffffff83e217f3>] sctp_inq_push+0x93/0xc0 net/sctp/inqueue.c:80
    [<ffffffff83e3f6f2>] sctp_backlog_rcv+0xa2/0x4b0 net/sctp/input.c:344
    [<ffffffff836ca75e>] sk_backlog_rcv include/net/sock.h:1020 [inline]
    [<ffffffff836ca75e>] __release_sock+0xbe/0x140 net/core/sock.c:2594
    [<ffffffff836ca812>] release_sock+0x32/0xd0 net/core/sock.c:3118
    [<ffffffff83a4acf9>] inet_shutdown+0xd9/0x1a0 net/ipv4/af_inet.c:912
    [<ffffffff836c187b>] __sys_shutdown_sock net/socket.c:2224 [inline]
    [<ffffffff836c187b>] __sys_shutdown_sock net/socket.c:2218 [inline]
    [<ffffffff836c187b>] __sys_shutdown+0x6b/0xd0 net/socket.c:2236
    [<ffffffff836c18f6>] __do_sys_shutdown net/socket.c:2244 [inline]
    [<ffffffff836c18f6>] __se_sys_shutdown net/socket.c:2242 [inline]
    [<ffffffff836c18f6>] __x64_sys_shutdown+0x16/0x20 net/socket.c:2242
    [<ffffffff8439b235>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff8439b235>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Crashes (11):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/07/08 13:51	upstream	3dbdb38e2869	95793bce	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/06/10 05:42	upstream	cd1245d75ce9	1ba81399	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/04/14 16:43	upstream	50987beca096	3134b37f	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/03/11 18:32	upstream	a74e6a014c9d	c2ca1f2a	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/02/07 01:49	upstream	964d069f93c4	0655e081	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/02/03 11:47	upstream	3aaf0a27ffc2	624dad51	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/02/01 04:27	upstream	6642d600b541	fc9fd31e	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/01/24 18:31	upstream	e1ae4b0be158	52e37319	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/01/22 16:35	upstream	9f29bd8b2e71	d4f4eca5	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/01/16 22:00	upstream	1d94330a437a	65a7a854	.config	log	report	syz	C
ci-upstream-gce-leak	2020/07/22 17:57	upstream	4fa640dc5230	128cd85f	.config	log	report	syz	C