memory leak in h4_recv_buf

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    abf02e29 Merge tag 'pm-5.2-rc6' of git://git.kernel.org/pu..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1054e6b2a00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=56f1da14935c3cce
dashboard link: https://syzkaller.appspot.com/bug?extid=97388eb9d31b997fe1d0
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1073d8aaa00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17b36fbea00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+97388eb9d31b997fe1d0@xxxxxxxxxxxxxxxxxxxxxxxxx

program
BUG: memory leak
unreferenced object 0xffff88810991fa00 (size 224):
  comm "syz-executor739", pid 7080, jiffies 4294949854 (age 18.640s)
  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:
    [<00000000da42c09f>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
    [<00000000da42c09f>] slab_post_alloc_hook mm/slab.h:439 [inline]
    [<00000000da42c09f>] slab_alloc_node mm/slab.c:3269 [inline]
    [<00000000da42c09f>] kmem_cache_alloc_node+0x153/0x2a0 mm/slab.c:3579
    [<00000000f6fbcf84>] __alloc_skb+0x6e/0x210 net/core/skbuff.c:194
    [<00000000ea93fc4c>] alloc_skb include/linux/skbuff.h:1054 [inline]
    [<00000000ea93fc4c>] bt_skb_alloc include/net/bluetooth/bluetooth.h:339  
[inline]
    [<00000000ea93fc4c>] h4_recv_buf+0x26d/0x450  
drivers/bluetooth/hci_h4.c:182
    [<00000000e0312475>] h4_recv+0x51/0xb0 drivers/bluetooth/hci_h4.c:116
    [<00000000ebf11fab>] hci_uart_tty_receive+0xba/0x200  
drivers/bluetooth/hci_ldisc.c:592
    [<0000000095e1216e>] tiocsti drivers/tty/tty_io.c:2195 [inline]
    [<0000000095e1216e>] tty_ioctl+0x81c/0xa30 drivers/tty/tty_io.c:2571
    [<000000009fa523f0>] vfs_ioctl fs/ioctl.c:46 [inline]
    [<000000009fa523f0>] file_ioctl fs/ioctl.c:509 [inline]
    [<000000009fa523f0>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
    [<000000000cebb5d9>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
    [<000000001630008a>] __do_sys_ioctl fs/ioctl.c:720 [inline]
    [<000000001630008a>] __se_sys_ioctl fs/ioctl.c:718 [inline]
    [<000000001630008a>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
    [<00000000c62091e3>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
    [<000000005c213625>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff8881204f4400 (size 1024):
  comm "syz-executor739", pid 7080, jiffies 4294949854 (age 18.640s)
  hex dump (first 32 bytes):
    6c 69 62 75 64 65 76 00 fe ed ca fe 28 00 00 00  libudev.....(...
    28 00 00 00 a0 00 00 00 52 ca da 77 00 00 00 00  (.......R..w....
  backtrace:
    [<0000000034504843>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
    [<0000000034504843>] slab_post_alloc_hook mm/slab.h:439 [inline]
    [<0000000034504843>] slab_alloc_node mm/slab.c:3269 [inline]
    [<0000000034504843>] kmem_cache_alloc_node_trace+0x15b/0x2a0  
mm/slab.c:3597
    [<0000000056d30eb5>] __do_kmalloc_node mm/slab.c:3619 [inline]
    [<0000000056d30eb5>] __kmalloc_node_track_caller+0x38/0x50  
mm/slab.c:3634
    [<00000000df40176c>] __kmalloc_reserve.isra.0+0x40/0xb0  
net/core/skbuff.c:138
    [<0000000035340e64>] __alloc_skb+0xa0/0x210 net/core/skbuff.c:206
    [<00000000ea93fc4c>] alloc_skb include/linux/skbuff.h:1054 [inline]
    [<00000000ea93fc4c>] bt_skb_alloc include/net/bluetooth/bluetooth.h:339  
[inline]
    [<00000000ea93fc4c>] h4_recv_buf+0x26d/0x450  
drivers/bluetooth/hci_h4.c:182
    [<00000000e0312475>] h4_recv+0x51/0xb0 drivers/bluetooth/hci_h4.c:116
    [<00000000ebf11fab>] hci_uart_tty_receive+0xba/0x200  
drivers/bluetooth/hci_ldisc.c:592
    [<0000000095e1216e>] tiocsti drivers/tty/tty_io.c:2195 [inline]
    [<0000000095e1216e>] tty_ioctl+0x81c/0xa30 drivers/tty/tty_io.c:2571
    [<000000009fa523f0>] vfs_ioctl fs/ioctl.c:46 [inline]
    [<000000009fa523f0>] file_ioctl fs/ioctl.c:509 [inline]
    [<000000009fa523f0>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
    [<000000000cebb5d9>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
    [<000000001630008a>] __do_sys_ioctl fs/ioctl.c:720 [inline]
    [<000000001630008a>] __se_sys_ioctl fs/ioctl.c:718 [inline]
    [<000000001630008a>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
    [<00000000c62091e3>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
    [<000000005c213625>] entry_SYSCALL_64_after_hwframe+0x44/0xa9



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