capability: warning: `syz-executor5' uses deprecated v2 capabilities in a way that may be insecure vhci_hcd: invalid port number 76 ================================================================== BUG: KASAN: slab-out-of-bounds in vhci_hub_control+0x2a7d/0x2b70 drivers/usb/usbip/vhci_hcd.c:441 Read of size 4 at addr ffff8801cdf303bc by task syz-executor1/10600 CPU: 1 PID: 10600 Comm: syz-executor1 Not tainted 4.19.0-rc4-next-20180921+ #77 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+0x1d3/0x2c4 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+0x2a7d/0x2b70 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+0x1974/0x2280 drivers/usb/core/hcd.c:1651 usb_submit_urb+0x893/0x1580 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 kobject: 'loop4' (00000000da52bcf3): kobject_uevent_env usbdev_do_ioctl+0x1eb8/0x3b50 drivers/usb/core/devio.c:2412 kobject: 'loop4' (00000000da52bcf3): fill_kobj_path: path = '/devices/virtual/block/loop4' usbdev_ioctl+0x25/0x30 drivers/usb/core/devio.c:2569 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:00007f5a4cfcac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5a4cfcb6d4 RCX: 0000000000457679 RDX: 0000000020000000 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 7010: 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 prepare_creds+0xab/0x4d0 kernel/cred.c:252 do_faccessat+0xa3/0x800 fs/open.c:359 __do_sys_access fs/open.c:430 [inline] __se_sys_access fs/open.c:428 [inline] __x64_sys_access+0x59/0x80 fs/open.c:428 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7009: 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 put_cred_rcu+0x400/0x780 kernel/cred.c:126 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2437 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline] rcu_process_callbacks+0xff9/0x1ad0 kernel/rcu/tree.c:2697 __do_softirq+0x30b/0xb03 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801cdf30300 which belongs to the cache cred_jar of size 184 The buggy address is located 4 bytes to the right of 184-byte region [ffff8801cdf30300, ffff8801cdf303b8) The buggy address belongs to the page: page:ffffea000737cc00 count:1 mapcount:0 mapping:ffff8801da978300 index:0xffff8801cdf30000 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea0007471c88 ffffea00074cb1c8 ffff8801da978300 raw: ffff8801cdf30000 ffff8801cdf30000 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cdf30280: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff8801cdf30300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801cdf30380: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ^ ffff8801cdf30400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cdf30480: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ==================================================================