memory leak in __pskb_copy

memory leak in __pskb_copy_fclone
Status: upstream: reported C repro on 2021/02/22 09:25
Reported-by: syzbot+44b651863a17760a893b@syzkaller.appspotmail.com
First crash: 78d, last: 4d12h

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/03/19 00:07	8m	tseewald@gmail.com	patch	git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git master	report log
2021/03/09 23:36	8m	tseewald@gmail.com		git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git master	report log

Sample crash report:

BUG: memory leak
unreferenced object 0xffff888112b5bf00 (size 232):
  comm "syz-executor599", pid 8394, jiffies 4294947826 (age 12.570s)
  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:
    [<ffffffff8367cc7f>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:413
    [<ffffffff83685383>] __pskb_copy_fclone+0x73/0x330 net/core/skbuff.c:1602
    [<ffffffff83f8bc43>] __pskb_copy include/linux/skbuff.h:1171 [inline]
    [<ffffffff83f8bc43>] tipc_msg_reassemble+0x163/0x1a0 net/tipc/msg.c:781
    [<ffffffff83f79ea2>] tipc_mcast_xmit+0x392/0x7c0 net/tipc/bcast.c:392
    [<ffffffff83fa6b7d>] tipc_sendmcast+0x32d/0x410 net/tipc/socket.c:887
    [<ffffffff83fa7466>] __tipc_sendmsg+0x806/0xa60 net/tipc/socket.c:1472
    [<ffffffff83fa76f1>] tipc_sendmsg+0x31/0x50 net/tipc/socket.c:1406
    [<ffffffff8366c836>] sock_sendmsg_nosec net/socket.c:654 [inline]
    [<ffffffff8366c836>] sock_sendmsg+0x56/0x80 net/socket.c:674
    [<ffffffff83672bff>] sock_no_sendpage+0x8f/0xc0 net/core/sock.c:2854
    [<ffffffff8366c13b>] kernel_sendpage.part.0+0xeb/0x150 net/socket.c:3631
    [<ffffffff8366ce1b>] kernel_sendpage net/socket.c:3628 [inline]
    [<ffffffff8366ce1b>] sock_sendpage+0x5b/0x90 net/socket.c:947
    [<ffffffff815b0c92>] pipe_to_sendpage+0xa2/0x110 fs/splice.c:364
    [<ffffffff815b2b32>] splice_from_pipe_feed fs/splice.c:418 [inline]
    [<ffffffff815b2b32>] __splice_from_pipe+0x1e2/0x330 fs/splice.c:562
    [<ffffffff815b335f>] splice_from_pipe fs/splice.c:597 [inline]
    [<ffffffff815b335f>] generic_splice_sendpage+0x6f/0xa0 fs/splice.c:746
    [<ffffffff815b0d4b>] do_splice_from fs/splice.c:767 [inline]
    [<ffffffff815b0d4b>] direct_splice_actor+0x4b/0x70 fs/splice.c:936
    [<ffffffff815b1463>] splice_direct_to_actor+0x153/0x350 fs/splice.c:891

Crashes (19):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/05/05 06:48	upstream	e4adffb8	06c27ff5	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/21 10:51	upstream	1fe5501b	95777977	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/20 17:32	upstream	7af08140	c0ced557	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/20 03:18	upstream	7af08140	4285c989	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/18 13:53	upstream	c98ff1d0	7e2b734b	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/15 23:05	upstream	7e25f40e	c59079a6	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/14 03:19	upstream	eebe426d	a184b83e	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/11 11:48	upstream	52e44129	bfeda1b1	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/08 20:11	upstream	454859c5	6a81331a	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/04 16:15	upstream	2023a53b	6a81331a	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/04/02 07:52	upstream	ffd9fb54	6a81331a	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/03/29 10:50	upstream	36a14638	a8529b82	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/03/28 05:44	upstream	0f4498ce	a8529b82	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/03/26 01:53	upstream	e1381380	6a383ecf	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/03/10 05:22	upstream	144c79ef	26967e35	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/03/08 17:21	upstream	144c79ef	09fbf400	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/03/06 23:00	upstream	a38fd874	e4b4d570	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/02/28 16:31	upstream	5695e516	4c37c133	.config	log	report	syz	C	memory leak in __pskb_copy_fclone
ci-upstream-gce-leak	2021/02/20 15:08	upstream	f40ddce8	3e5ed8b4	.config	log	report	syz	C	memory leak in __pskb_copy_fclone