memory leak in sctp_stream_init

memory leak in sctp_stream_init_ext (2)
Status: upstream: reported syz repro on 2020/04/17 03:45
Reported-by: syzbot+96e916d6f6f7617bc9fc@syzkaller.appspotmail.com
First crash: 113d, last: 113d

similar bugs (1):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	memory leak in sctp_stream_init_ext	C		34	299d	434d	14/17	fixed on 2019/10/28 17:50

Sample crash report:

BUG: memory leak
unreferenced object 0xffff888103ba4580 (size 96):
  comm "syz-executor.1", pid 8335, jiffies 4294953411 (age 14.410s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000b06f3e80>] kmalloc include/linux/slab.h:555 [inline]
    [<00000000b06f3e80>] kzalloc include/linux/slab.h:669 [inline]
    [<00000000b06f3e80>] sctp_stream_init_ext+0x28/0xe0 net/sctp/stream.c:162
    [<00000000aff2ecba>] sctp_sendmsg_to_asoc+0x9af/0xab0 net/sctp/socket.c:1811
    [<00000000d5d5eb76>] sctp_sendmsg+0x2a6/0xc60 net/sctp/socket.c:2031
    [<0000000023cdbfa3>] inet_sendmsg+0x39/0x60 net/ipv4/af_inet.c:807
    [<00000000885878ef>] sock_sendmsg_nosec net/socket.c:652 [inline]
    [<00000000885878ef>] sock_sendmsg+0x4c/0x60 net/socket.c:672
    [<0000000009d727e5>] __sys_sendto+0x11d/0x1c0 net/socket.c:2000
    [<0000000066974477>] __do_sys_sendto net/socket.c:2012 [inline]
    [<0000000066974477>] __se_sys_sendto net/socket.c:2008 [inline]
    [<0000000066974477>] __x64_sys_sendto+0x26/0x30 net/socket.c:2008
    [<00000000ecc1fea9>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295
    [<00000000605d798b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-gce-leak	2020/04/16 13:39	upstream	00086336	c743fcb3	.config	log	report	syz		davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, marcelo.leitner@gmail.com, netdev@vger.kernel.org, nhorman@tuxdriver.com, vyasevich@gmail.com