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BUG: KASAN: slab-out-of-bounds in vhci_hub_control+0x1b6d/0x1be0 drivers/usb/usbip/vhci_hcd.c:441
Read of size 4 at addr ffff8801ce7603bc by task syz-executor2/24301

CPU: 0 PID: 24301 Comm: syz-executor2 Not tainted 4.19.0-rc6+ #167
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+0x1b6d/0x1be0 drivers/usb/usbip/vhci_hcd.c:441
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
 rh_call_control drivers/usb/core/hcd.c:679 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:838 [inline]
 usb_hcd_submit_urb+0x17bb/0x20a0 drivers/usb/core/hcd.c:1651
 usb_submit_urb+0x893/0x14e0 drivers/usb/core/urb.c:570
 usb_start_wait_urb+0x13d/0x370 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:2412
 usbdev_compat_ioctl+0x24/0x30 drivers/usb/core/devio.c:2580
 __do_compat_sys_ioctl fs/compat_ioctl.c:1419 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:1365 [inline]
 __ia32_compat_sys_ioctl+0x20e/0x630 fs/compat_ioctl.c:1365
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f61ca9
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5f5d0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c0185500
RDX: 0000000020000080 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 23543:
 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
 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620
 kmalloc include/linux/slab.h:513 [inline]
 perf_event_mmap_event kernel/events/core.c:7255 [inline]
 perf_event_mmap+0x77b/0x1350 kernel/events/core.c:7453
 mmap_region+0x48d/0x1cd0 mm/mmap.c:1795
 do_mmap+0xa10/0x1220 mm/mmap.c:1535
 do_mmap_pgoff include/linux/mm.h:2298 [inline]
 vm_mmap_pgoff+0x213/0x2c0 mm/util.c:357
 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1585
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 23543:
 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]
 kfree+0xcf/0x230 mm/slab.c:3813
 perf_event_mmap_event kernel/events/core.c:7335 [inline]
 perf_event_mmap+0xd4f/0x1350 kernel/events/core.c:7453
 mmap_region+0x48d/0x1cd0 mm/mmap.c:1795
 do_mmap+0xa10/0x1220 mm/mmap.c:1535
 do_mmap_pgoff include/linux/mm.h:2298 [inline]
 vm_mmap_pgoff+0x213/0x2c0 mm/util.c:357
 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1585
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801ce760480
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 196 bytes to the left of
 4096-byte region [ffff8801ce760480, ffff8801ce761480)
The buggy address belongs to the page:
page:ffffea000739d800 count:1 mapcount:0 mapping:ffff8801da800dc0 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea00072ecf88 ffffea0006571a08 ffff8801da800dc0
raw: 0000000000000000 ffff8801ce760480 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ce760280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ce760300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801ce760380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                        ^
 ffff8801ce760400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ce760480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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