memory leak in __pskb_copy_fclone

syzbot
2021-02-22T09:27:07Z

Hello,

syzbot found the following issue on:

HEAD commit: f40ddce8 Linux 5.11
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17b89c34d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=5528e8db7fc481ae
dashboard link: https://syzkaller.appspot.com/bug?extid=44b651863a17760a893b
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a9d40cd00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1208fccad00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+44b651863a17760a893b@syzkaller.appspotmail.com

executing program
executing program
BUG: memory leak
unreferenced object 0xffff888110c36e00 (size 232):
comm "syz-executor899", pid 8419, jiffies 4294996042 (age 38.220s)
hex dump (first 32 bytes):
10 1b f0 10 81 88 ff ff 10 1b f0 10 81 88 ff ff ................
00 00 00 00 00 00 00 00 40 1a f0 10 81 88 ff ff ........@.......
backtrace:
[<00000000b4534d28>] __alloc_skb+0x6d/0x280 net/core/skbuff.c:198
[<00000000a1f27cd4>] __pskb_copy_fclone+0x73/0x330 net/core/skbuff.c:1563
[<000000003311a1de>] __pskb_copy include/linux/skbuff.h:1163 [inline]
[<000000003311a1de>] pskb_copy include/linux/skbuff.h:3130 [inline]
[<000000003311a1de>] hwsim_hw_xmit+0xd3/0x140 drivers/net/ieee802154/mac802154_hwsim.c:132
[<00000000c07253fa>] drv_xmit_async net/mac802154/driver-ops.h:16 [inline]
[<00000000c07253fa>] ieee802154_tx+0xc7/0x190 net/mac802154/tx.c:83
[<000000001b265c49>] ieee802154_subif_start_xmit+0x58/0x70 net/mac802154/tx.c:132
[<00000000908eabe9>] __netdev_start_xmit include/linux/netdevice.h:4778 [inline]
[<00000000908eabe9>] netdev_start_xmit include/linux/netdevice.h:4792 [inline]
[<00000000908eabe9>] xmit_one net/core/dev.c:3574 [inline]
[<00000000908eabe9>] dev_hard_start_xmit+0xe1/0x330 net/core/dev.c:3590
[<000000007fbb3187>] sch_direct_xmit+0x1c5/0x500 net/sched/sch_generic.c:313
[<000000001df39c76>] qdisc_restart net/sched/sch_generic.c:376 [inline]
[<000000001df39c76>] __qdisc_run+0x201/0x810 net/sched/sch_generic.c:384
[<000000002521364f>] qdisc_run include/net/pkt_sched.h:136 [inline]
[<000000002521364f>] qdisc_run include/net/pkt_sched.h:128 [inline]
[<000000002521364f>] __dev_xmit_skb net/core/dev.c:3765 [inline]
[<000000002521364f>] __dev_queue_xmit+0xb9b/0xf60 net/core/dev.c:4119
[<00000000fe77cf74>] dgram_sendmsg+0x40c/0x4d0 net/ieee802154/socket.c:682
[<00000000f9f3520e>] sock_sendmsg_nosec net/socket.c:652 [inline]
[<00000000f9f3520e>] sock_sendmsg+0x56/0x80 net/socket.c:672
[<000000005e70a8bc>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2345
[<00000000e2a23226>] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2399
[<000000008b9fc415>] __sys_sendmsg+0x88/0x100 net/socket.c:2432
[<0000000089dd1aab>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000011f571a2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888103ae5f00 (size 232):
comm "syz-executor899", pid 8428, jiffies 4294998453 (age 14.110s)
hex dump (first 32 bytes):
50 1b f0 10 81 88 ff ff 50 1b f0 10 81 88 ff ff P.......P.......
00 00 00 00 00 00 00 00 80 1a f0 10 81 88 ff ff ................
backtrace:
[<00000000b4534d28>] __alloc_skb+0x6d/0x280 net/core/skbuff.c:198
[<00000000a1f27cd4>] __pskb_copy_fclone+0x73/0x330 net/core/skbuff.c:1563
[<000000003311a1de>] __pskb_copy include/linux/skbuff.h:1163 [inline]
[<000000003311a1de>] pskb_copy include/linux/skbuff.h:3130 [inline]
[<000000003311a1de>] hwsim_hw_xmit+0xd3/0x140 drivers/net/ieee802154/mac802154_hwsim.c:132
[<00000000c07253fa>] drv_xmit_async net/mac802154/driver-ops.h:16 [inline]
[<00000000c07253fa>] ieee802154_tx+0xc7/0x190 net/mac802154/tx.c:83
[<000000001b265c49>] ieee802154_subif_start_xmit+0x58/0x70 net/mac802154/tx.c:132
[<00000000908eabe9>] __netdev_start_xmit include/linux/netdevice.h:4778 [inline]
[<00000000908eabe9>] netdev_start_xmit include/linux/netdevice.h:4792 [inline]
[<00000000908eabe9>] xmit_one net/core/dev.c:3574 [inline]
[<00000000908eabe9>] dev_hard_start_xmit+0xe1/0x330 net/core/dev.c:3590
[<000000007fbb3187>] sch_direct_xmit+0x1c5/0x500 net/sched/sch_generic.c:313
[<000000001df39c76>] qdisc_restart net/sched/sch_generic.c:376 [inline]
[<000000001df39c76>] __qdisc_run+0x201/0x810 net/sched/sch_generic.c:384
[<000000002521364f>] qdisc_run include/net/pkt_sched.h:136 [inline]
[<000000002521364f>] qdisc_run include/net/pkt_sched.h:128 [inline]
[<000000002521364f>] __dev_xmit_skb net/core/dev.c:3765 [inline]
[<000000002521364f>] __dev_queue_xmit+0xb9b/0xf60 net/core/dev.c:4119
[<00000000fe77cf74>] dgram_sendmsg+0x40c/0x4d0 net/ieee802154/socket.c:682
[<00000000f9f3520e>] sock_sendmsg_nosec net/socket.c:652 [inline]
[<00000000f9f3520e>] sock_sendmsg+0x56/0x80 net/socket.c:672
[<000000005e70a8bc>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2345
[<00000000e2a23226>] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2399
[<000000008b9fc415>] __sys_sendmsg+0x88/0x100 net/socket.c:2432
[<0000000089dd1aab>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000011f571a2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810d717c00 (size 512):
comm "syz-executor899", pid 8428, jiffies 4294998453 (age 14.110s)
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:
[<0000000010ef2c1d>] __kmalloc_reserve net/core/skbuff.c:142 [inline]
[<0000000010ef2c1d>] __alloc_skb+0xab/0x280 net/core/skbuff.c:210
[<00000000a1f27cd4>] __pskb_copy_fclone+0x73/0x330 net/core/skbuff.c:1563
[<000000003311a1de>] __pskb_copy include/linux/skbuff.h:1163 [inline]
[<000000003311a1de>] pskb_copy include/linux/skbuff.h:3130 [inline]
[<000000003311a1de>] hwsim_hw_xmit+0xd3/0x140 drivers/net/ieee802154/mac802154_hwsim.c:132
[<00000000c07253fa>] drv_xmit_async net/mac802154/driver-ops.h:16 [inline]
[<00000000c07253fa>] ieee802154_tx+0xc7/0x190 net/mac802154/tx.c:83
[<000000001b265c49>] ieee802154_subif_start_xmit+0x58/0x70 net/mac802154/tx.c:132
[<00000000908eabe9>] __netdev_start_xmit include/linux/netdevice.h:4778 [inline]
[<00000000908eabe9>] netdev_start_xmit include/linux/netdevice.h:4792 [inline]
[<00000000908eabe9>] xmit_one net/core/dev.c:3574 [inline]
[<00000000908eabe9>] dev_hard_start_xmit+0xe1/0x330 net/core/dev.c:3590
[<000000007fbb3187>] sch_direct_xmit+0x1c5/0x500 net/sched/sch_generic.c:313
[<000000001df39c76>] qdisc_restart net/sched/sch_generic.c:376 [inline]
[<000000001df39c76>] __qdisc_run+0x201/0x810 net/sched/sch_generic.c:384
[<000000002521364f>] qdisc_run include/net/pkt_sched.h:136 [inline]
[<000000002521364f>] qdisc_run include/net/pkt_sched.h:128 [inline]
[<000000002521364f>] __dev_xmit_skb net/core/dev.c:3765 [inline]
[<000000002521364f>] __dev_queue_xmit+0xb9b/0xf60 net/core/dev.c:4119
[<00000000fe77cf74>] dgram_sendmsg+0x40c/0x4d0 net/ieee802154/socket.c:682
[<00000000f9f3520e>] sock_sendmsg_nosec net/socket.c:652 [inline]
[<00000000f9f3520e>] sock_sendmsg+0x56/0x80 net/socket.c:672
[<000000005e70a8bc>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2345
[<00000000e2a23226>] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2399
[<000000008b9fc415>] __sys_sendmsg+0x88/0x100 net/socket.c:2432
[<0000000089dd1aab>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000011f571a2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

---
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