9pnet_virtio: no channels available for device /dev/md0 vhci_hcd: invalid port number 177 ================================================================== BUG: KASAN: slab-out-of-bounds in vhci_hub_control+0x1b88/0x1bf0 drivers/usb/usbip/vhci_hcd.c:441 Read of size 4 at addr ffff8801cfc067dc by task syz-executor1/19909 CPU: 1 PID: 19909 Comm: syz-executor1 Not tainted 4.19.0-rc2-next-20180904+ #55 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 9pnet_virtio: no channels available for device /dev/md0 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 vhci_hub_control+0x1b88/0x1bf0 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+0x184a/0x2160 drivers/usb/core/hcd.c:1651 usb_submit_urb+0x895/0x14d0 drivers/usb/core/urb.c:570 usb_start_wait_urb+0x140/0x360 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+0x1eb4/0x3b30 drivers/usb/core/devio.c:2394 9pnet_virtio: no channels available for device /dev/md0 9pnet_virtio: no channels available for device /dev/md0 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: 0033:0x457099 Code: fd 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa7b660bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa7b660c6d4 RCX: 0000000000457099 RDX: 0000000020000000 RSI: 00000000c0185500 RDI: 0000000000000004 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cebc0 R14: 00000000004c503e R15: 0000000000000000 Allocated by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x720 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:707 [inline] __register_sysctl_table+0xc7/0x1040 fs/proc/proc_sysctl.c:1307 register_net_sysctl+0x29/0x30 net/sysctl_net.c:120 neigh_sysctl_register+0x399/0x730 net/core/neighbour.c:3236 devinet_sysctl_register+0xb4/0x220 net/ipv4/devinet.c:2372 inetdev_init+0x2dc/0x590 net/ipv4/devinet.c:264 inetdev_event+0xf45/0x1370 net/ipv4/devinet.c:1468 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1733 call_netdevice_notifiers net/core/dev.c:1751 [inline] register_netdevice+0xb9d/0x1100 net/core/dev.c:8508 register_netdev+0x30/0x50 net/core/dev.c:8594 virtnet_probe+0x12d0/0x2260 drivers/net/virtio_net.c:3014 virtio_dev_probe+0x592/0x942 drivers/virtio/virtio.c:245 really_probe+0x5be/0x850 drivers/base/dd.c:500 driver_probe_device+0x108/0x210 drivers/base/dd.c:662 __driver_attach+0x28b/0x2f0 drivers/base/dd.c:896 bus_for_each_dev+0x15d/0x1f0 drivers/base/bus.c:311 driver_attach+0x3d/0x50 drivers/base/dd.c:915 bus_add_driver+0x4b2/0x600 drivers/base/bus.c:667 driver_register+0x1c8/0x320 drivers/base/driver.c:170 register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296 virtio_net_driver_init+0x8d/0xc9 drivers/net/virtio_net.c:3186 do_one_initcall+0x127/0x838 init/main.c:885 do_initcall_level init/main.c:953 [inline] do_initcalls init/main.c:961 [inline] do_basic_setup init/main.c:979 [inline] kernel_init_freeable+0x4bb/0x5ae init/main.c:1144 kernel_init+0x11/0x1b3 init/main.c:1063 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8801cfc064c0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 796 bytes inside of 1024-byte region [ffff8801cfc064c0, ffff8801cfc068c0) The buggy address belongs to the page: page:ffffea00073f0180 count:1 mapcount:0 mapping:ffff8801dac00ac0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00074fed88 ffffea00073e4008 ffff8801dac00ac0 raw: 0000000000000000 ffff8801cfc06040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cfc06680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801cfc06700: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801cfc06780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801cfc06800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801cfc06880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================