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: 273d, last: 7d07h

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
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:

Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.73' (ECDSA) to the list of known hosts.
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810dba3c00 (size 232):
  comm "syz-executor139", pid 8387, jiffies 4294942478 (age 13.190s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 a0 12 01 81 88 ff ff 40 40 8b 08 81 88 ff ff  ........@@......
  backtrace:
    [<ffffffff8364c28f>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:412
    [<ffffffff83d98c07>] alloc_skb include/linux/skbuff.h:1103 [inline]
    [<ffffffff83d98c07>] sctp_packet_transmit+0x117/0xc20 net/sctp/output.c:565
    [<ffffffff83d7d6e1>] sctp_outq_flush_transports+0x151/0x1c0 net/sctp/outqueue.c:1154
    [<ffffffff83d803ef>] sctp_outq_flush net/sctp/outqueue.c:1202 [inline]
    [<ffffffff83d803ef>] sctp_outq_uncork+0xaf/0xd0 net/sctp/outqueue.c:758
    [<ffffffff83d68422>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1801 [inline]
    [<ffffffff83d68422>] sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline]
    [<ffffffff83d68422>] sctp_do_sm+0x312/0x2370 net/sctp/sm_sideeffect.c:1156
    [<ffffffff83d6efc3>] sctp_assoc_bh_rcv+0x1e3/0x300 net/sctp/associola.c:1048
    [<ffffffff83d7d123>] sctp_inq_push+0x93/0xc0 net/sctp/inqueue.c:80
    [<ffffffff83d9a5c2>] sctp_backlog_rcv+0xa2/0x4b0 net/sctp/input.c:344
    [<ffffffff83648c81>] sk_backlog_rcv include/net/sock.h:1020 [inline]
    [<ffffffff83648c81>] __release_sock+0xc1/0x140 net/core/sock.c:2550
    [<ffffffff83648d32>] release_sock+0x32/0xd0 net/core/sock.c:3074
    [<ffffffff839b4349>] inet_shutdown+0xd9/0x1a0 net/ipv4/af_inet.c:912
    [<ffffffff8363fdfb>] __sys_shutdown_sock net/socket.c:2189 [inline]
    [<ffffffff8363fdfb>] __sys_shutdown_sock net/socket.c:2183 [inline]
    [<ffffffff8363fdfb>] __sys_shutdown+0x6b/0xd0 net/socket.c:2201
    [<ffffffff8363fe76>] __do_sys_shutdown net/socket.c:2209 [inline]
    [<ffffffff8363fe76>] __se_sys_shutdown net/socket.c:2207 [inline]
    [<ffffffff8363fe76>] __x64_sys_shutdown+0x16/0x20 net/socket.c:2207
    [<ffffffff842e0f6d>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Crashes (9):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/04/14 16:43	upstream	50987bec	3134b37f	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/03/11 18:32	upstream	a74e6a01	c2ca1f2a	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/02/07 01:49	upstream	964d069f	0655e081	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/02/03 11:47	upstream	3aaf0a27	624dad51	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/02/01 04:27	upstream	6642d600	fc9fd31e	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/01/24 18:31	upstream	e1ae4b0b	52e37319	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/01/22 16:35	upstream	9f29bd8b	d4f4eca5	.config	log	report	syz	C	memory leak in sctp_packet_transmit
ci-upstream-gce-leak	2021/01/16 22:00	upstream	1d94330a	65a7a854	.config	log	report	syz	C
ci-upstream-gce-leak	2020/07/22 17:57	upstream	4fa640dc	128cd85f	.config	log	report	syz	C