vhci_hcd: invalid port number 76
==================================================================
BUG: KASAN: use-after-free in vhci_hub_control+0x2b06/0x2c40 drivers/usb/usbip/vhci_hcd.c:441
Read of size 4 at addr ffff8801ce3ec3bc by task syz-executor1/21917

CPU: 1 PID: 21917 Comm: syz-executor1 Not tainted 4.19.0-rc4+ #249
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 vhci_hub_control+0x2b06/0x2c40 drivers/usb/usbip/vhci_hcd.c:441
 rh_call_control drivers/usb/core/hcd.c:679 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:838 [inline]
 usb_hcd_submit_urb+0x1973/0x22b0 drivers/usb/core/hcd.c:1651
 usb_submit_urb+0x893/0x1590 drivers/usb/core/urb.c:570
 usb_start_wait_urb+0x13d/0x5a0 drivers/usb/core/message.c:57
 usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
 usb_control_msg+0x332/0x4e0 drivers/usb/core/message.c:152
 proc_control+0x99b/0xef0 drivers/usb/core/devio.c:1106
 usbdev_do_ioctl+0x1eb8/0x3b50 drivers/usb/core/devio.c:2394
 usbdev_ioctl+0x25/0x30 drivers/usb/core/devio.c:2551
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl fs/ioctl.c:707 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457679
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa399cc7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa399cc86d4 RCX: 0000000000457679
RDX: 0000000020000100 RSI: 00000000c0185500 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cf508 R14: 00000000004bf7f2 R15: 0000000000000000

Allocated by task 19253:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554
 dup_mm kernel/fork.c:1265 [inline]
 copy_mm kernel/fork.c:1329 [inline]
 copy_process+0x3564/0x8780 kernel/fork.c:1869
 _do_fork+0x1cb/0x11d0 kernel/fork.c:2166
 __do_sys_clone kernel/fork.c:2273 [inline]
 __se_sys_clone kernel/fork.c:2267 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2267
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 21772:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x83/0x290 mm/slab.c:3756
 __mmdrop+0x347/0x4d0 kernel/fork.c:636
 mmdrop include/linux/sched/mm.h:49 [inline]
 __mmput kernel/fork.c:1011 [inline]
 mmput+0x4ca/0x610 kernel/fork.c:1022
 exit_mm kernel/exit.c:545 [inline]
 do_exit+0xe6f/0x2610 kernel/exit.c:854
 do_group_exit+0x177/0x440 kernel/exit.c:970
 get_signal+0x8b0/0x1980 kernel/signal.c:2513
 do_signal+0x9c/0x21e0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801ce3ec040
 which belongs to the cache mm_struct(81:syz3) of size 1496
The buggy address is located 892 bytes inside of
 1496-byte region [ffff8801ce3ec040, ffff8801ce3ec618)
The buggy address belongs to the page:
page:ffffea000738fb00 count:1 mapcount:0 mapping:ffff8801cecca200 index:0xffff8801ce3ec6c0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801cbabb738 ffffea00062dc788 ffff8801cecca200
raw: ffff8801ce3ec6c0 ffff8801ce3ec040 0000000100000002 ffff8801c7158180
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801c7158180

Memory state around the buggy address:
 ffff8801ce3ec280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801ce3ec300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801ce3ec380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8801ce3ec400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801ce3ec480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
kobject: 'net' (0000000026d8aedb): kobject_add_internal: parent: 'hwsim15', set: '(null)'
==================================================================