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: 8d07h, last: 5h48m

Sample crash report:

Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.1.124' (ECDSA) to the list of known hosts.
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810e58ad00 (size 232):
  comm "syz-executor386", pid 8350, jiffies 4294953897 (age 12.450s)
  hex dump (first 32 bytes):
    10 1b 41 0d 81 88 ff ff 10 1b 41 0d 81 88 ff ff  ..A.......A.....
    00 00 00 00 00 00 00 00 40 1a 41 0d 81 88 ff ff  ........@.A.....
  backtrace:
    [<00000000858072b1>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:412
    [<0000000050e52557>] __pskb_copy_fclone+0x73/0x330 net/core/skbuff.c:1601
    [<00000000b68b6f71>] __pskb_copy include/linux/skbuff.h:1166 [inline]
    [<00000000b68b6f71>] pskb_copy include/linux/skbuff.h:3190 [inline]
    [<00000000b68b6f71>] hwsim_hw_xmit+0xd3/0x140 drivers/net/ieee802154/mac802154_hwsim.c:132
    [<00000000b53f08ab>] drv_xmit_async net/mac802154/driver-ops.h:16 [inline]
    [<00000000b53f08ab>] ieee802154_tx+0xc7/0x190 net/mac802154/tx.c:83
    [<00000000b2293c6b>] ieee802154_subif_start_xmit+0x58/0x70 net/mac802154/tx.c:132
    [<00000000e348a1d1>] __netdev_start_xmit include/linux/netdevice.h:4825 [inline]
    [<00000000e348a1d1>] netdev_start_xmit include/linux/netdevice.h:4839 [inline]
    [<00000000e348a1d1>] xmit_one net/core/dev.c:3593 [inline]
    [<00000000e348a1d1>] dev_hard_start_xmit+0xe1/0x330 net/core/dev.c:3609
    [<000000000ff487fd>] sch_direct_xmit+0x1c5/0x500 net/sched/sch_generic.c:313
    [<00000000f067c655>] qdisc_restart net/sched/sch_generic.c:376 [inline]
    [<00000000f067c655>] __qdisc_run+0x201/0x810 net/sched/sch_generic.c:384
    [<0000000091092376>] qdisc_run include/net/pkt_sched.h:136 [inline]
    [<0000000091092376>] qdisc_run include/net/pkt_sched.h:128 [inline]
    [<0000000091092376>] __dev_xmit_skb net/core/dev.c:3795 [inline]
    [<0000000091092376>] __dev_queue_xmit+0xb9f/0xf60 net/core/dev.c:4150
    [<00000000ac74198a>] dgram_sendmsg+0x40c/0x4d0 net/ieee802154/socket.c:682
    [<00000000ab5b1890>] sock_sendmsg_nosec net/socket.c:654 [inline]
    [<00000000ab5b1890>] sock_sendmsg+0x56/0x80 net/socket.c:674
    [<00000000eb798e1e>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2350
    [<00000000f26bdb69>] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2404
    [<00000000c087d59e>] __sys_sendmsg+0x88/0x100 net/socket.c:2433
    [<000000001fdf3626>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000d6fdfc73>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88810dbb1200 (size 512):
  comm "syz-executor386", pid 8350, jiffies 4294953897 (age 12.450s)
  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:
    [<0000000098f6a312>] kmalloc_reserve net/core/skbuff.c:353 [inline]
    [<0000000098f6a312>] __alloc_skb+0xdf/0x280 net/core/skbuff.c:424
    [<0000000050e52557>] __pskb_copy_fclone+0x73/0x330 net/core/skbuff.c:1601
    [<00000000b68b6f71>] __pskb_copy include/linux/skbuff.h:1166 [inline]
    [<00000000b68b6f71>] pskb_copy include/linux/skbuff.h:3190 [inline]
    [<00000000b68b6f71>] hwsim_hw_xmit+0xd3/0x140 drivers/net/ieee802154/mac802154_hwsim.c:132
    [<00000000b53f08ab>] drv_xmit_async net/mac802154/driver-ops.h:16 [inline]
    [<00000000b53f08ab>] ieee802154_tx+0xc7/0x190 net/mac802154/tx.c:83
    [<00000000b2293c6b>] ieee802154_subif_start_xmit+0x58/0x70 net/mac802154/tx.c:132
    [<00000000e348a1d1>] __netdev_start_xmit include/linux/netdevice.h:4825 [inline]
    [<00000000e348a1d1>] netdev_start_xmit include/linux/netdevice.h:4839 [inline]
    [<00000000e348a1d1>] xmit_one net/core/dev.c:3593 [inline]
    [<00000000e348a1d1>] dev_hard_start_xmit+0xe1/0x330 net/core/dev.c:3609
    [<000000000ff487fd>] sch_direct_xmit+0x1c5/0x500 net/sched/sch_generic.c:313
    [<00000000f067c655>] qdisc_restart net/sched/sch_generic.c:376 [inline]
    [<00000000f067c655>] __qdisc_run+0x201/0x810 net/sched/sch_generic.c:384
    [<0000000091092376>] qdisc_run include/net/pkt_sched.h:136 [inline]
    [<0000000091092376>] qdisc_run include/net/pkt_sched.h:128 [inline]
    [<0000000091092376>] __dev_xmit_skb net/core/dev.c:3795 [inline]
    [<0000000091092376>] __dev_queue_xmit+0xb9f/0xf60 net/core/dev.c:4150
    [<00000000ac74198a>] dgram_sendmsg+0x40c/0x4d0 net/ieee802154/socket.c:682
    [<00000000ab5b1890>] sock_sendmsg_nosec net/socket.c:654 [inline]
    [<00000000ab5b1890>] sock_sendmsg+0x56/0x80 net/socket.c:674
    [<00000000eb798e1e>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2350
    [<00000000f26bdb69>] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2404
    [<00000000c087d59e>] __sys_sendmsg+0x88/0x100 net/socket.c:2433
    [<000000001fdf3626>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000d6fdfc73>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
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