syzbot

usb usb4: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb4: Product: Dummy host controller
usb usb4: Manufacturer: Linux 6.6.0-rc6-syzkaller-gd0d27ef87e1c dummy_hcd
usb usb4: SerialNumber: dummy_hcd.3
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 1 port detected
dummy_hcd dummy_hcd.4: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.4: Dummy host controller
dummy_hcd dummy_hcd.4: new USB bus registered, assigned bus number 5
usb usb5: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb5: Product: Dummy host controller
usb usb5: Manufacturer: Linux 6.6.0-rc6-syzkaller-gd0d27ef87e1c dummy_hcd
usb usb5: SerialNumber: dummy_hcd.4
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 1 port detected
dummy_hcd dummy_hcd.5: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.5: Dummy host controller
dummy_hcd dummy_hcd.5: new USB bus registered, assigned bus number 6
usb usb6: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb6: Product: Dummy host controller
usb usb6: Manufacturer: Linux 6.6.0-rc6-syzkaller-gd0d27ef87e1c dummy_hcd
usb usb6: SerialNumber: dummy_hcd.5
hub 6-0:1.0: USB hub found
hub 6-0:1.0: 1 port detected
dummy_hcd dummy_hcd.6: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.6: Dummy host controller
dummy_hcd dummy_hcd.6: new USB bus registered, assigned bus number 7
usb usb7: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
usb usb7: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb7: Product: Dummy host controller
usb usb7: Manufacturer: Linux 6.6.0-rc6-syzkaller-gd0d27ef87e1c dummy_hcd
usb usb7: SerialNumber: dummy_hcd.6
hub 7-0:1.0: USB hub found
hub 7-0:1.0: 1 port detected
dummy_hcd dummy_hcd.7: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.7: Dummy host controller
dummy_hcd dummy_hcd.7: new USB bus registered, assigned bus number 8
usb usb8: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
usb usb8: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb8: Product: Dummy host controller
usb usb8: Manufacturer: Linux 6.6.0-rc6-syzkaller-gd0d27ef87e1c dummy_hcd
usb usb8: SerialNumber: dummy_hcd.7
hub 8-0:1.0: USB hub found
hub 8-0:1.0: 1 port detected
vhci_hcd vhci_hcd.0: USB/IP Virtual Host Controller
vhci_hcd vhci_hcd.0: new USB bus registered, assigned bus number 9
==================================================================
BUG: KASAN: slab-out-of-bounds in vhci_setup+0x2d3/0x340 drivers/usb/usbip/vhci_hcd.c:1145
Write of size 8 at addr ffff888106773930 by task swapper/0/1

CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc6-syzkaller-gd0d27ef87e1c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 vhci_setup+0x2d3/0x340 drivers/usb/usbip/vhci_hcd.c:1145
 usb_add_hcd+0x5bc/0x1770 drivers/usb/core/hcd.c:2911
 vhci_hcd_probe+0x12c/0x460 drivers/usb/usbip/vhci_hcd.c:1363
 platform_probe+0xff/0x1e0 drivers/base/platform.c:1404
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x234/0xc90 drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x300 drivers/base/dd.c:958
 bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457
 __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
 device_add+0x117e/0x1aa0 drivers/base/core.c:3624
 platform_device_add+0x36d/0x840 drivers/base/platform.c:717
 platform_device_register_full+0x3ec/0x550 drivers/base/platform.c:844
 vhci_hcd_init+0x1ad/0x360 drivers/usb/usbip/vhci_hcd.c:1532
 do_one_initcall+0x117/0x630 init/main.c:1232
 do_initcall_level init/main.c:1294 [inline]
 do_initcalls init/main.c:1310 [inline]
 do_basic_setup init/main.c:1329 [inline]
 kernel_init_freeable+0x5bd/0x8f0 init/main.c:1547
 kernel_init+0x1c/0x2a0 init/main.c:1437
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>

Allocated by task 1:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x87/0x90 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1023 [inline]
 __kmalloc_node_track_caller+0x61/0x100 mm/slab_common.c:1043
 kvasprintf+0xbd/0x150 lib/kasprintf.c:25
 kvasprintf_const+0x66/0x190 lib/kasprintf.c:49
 kobject_set_name_vargs+0x5a/0x130 lib/kobject.c:272
 device_create_groups_vargs+0x1b1/0x270 drivers/base/core.c:4307
 device_create+0xe9/0x120 drivers/base/core.c:4350
 mon_bin_add+0xba/0x160 drivers/usb/mon/mon_bin.c:1366
 mon_bus_init+0x18e/0x320 drivers/usb/mon/mon_main.c:291
 mon_bus_add drivers/usb/mon/mon_main.c:188 [inline]
 mon_notify+0x32e/0x490 drivers/usb/mon/mon_main.c:219
 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93
 blocking_notifier_call_chain kernel/notifier.c:388 [inline]
 blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:376
 usb_register_bus drivers/usb/core/hcd.c:910 [inline]
 usb_add_hcd+0x34d/0x1770 drivers/usb/core/hcd.c:2852
 vhci_hcd_probe+0x12c/0x460 drivers/usb/usbip/vhci_hcd.c:1363
 platform_probe+0xff/0x1e0 drivers/base/platform.c:1404
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x234/0xc90 drivers/base/dd.c:658
 __driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:800
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830
 __device_attach_driver+0x1d4/0x300 drivers/base/dd.c:958
 bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457
 __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1030
 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
 device_add+0x117e/0x1aa0 drivers/base/core.c:3624
 platform_device_add+0x36d/0x840 drivers/base/platform.c:717
 platform_device_register_full+0x3ec/0x550 drivers/base/platform.c:844
 vhci_hcd_init+0x1ad/0x360 drivers/usb/usbip/vhci_hcd.c:1532
 do_one_initcall+0x117/0x630 init/main.c:1232
 do_initcall_level init/main.c:1294 [inline]
 do_initcalls init/main.c:1310 [inline]
 do_basic_setup init/main.c:1329 [inline]
 kernel_init_freeable+0x5bd/0x8f0 init/main.c:1547
 kernel_init+0x1c/0x2a0 init/main.c:1437
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

The buggy address belongs to the object at ffff888106773910
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 24 bytes to the right of
 allocated 8-byte region [ffff888106773910, ffff888106773918)

The buggy address belongs to the physical page:
page:ffffea000419dcc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106773
flags: 0x200000000000800(slab|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000000800 ffff888100041280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 7155693778, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x10e1/0x2fd0 mm/page_alloc.c:3170
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426
 alloc_page_interleave+0x1e/0x230 mm/mempolicy.c:2130
 alloc_pages+0x22a/0x270 mm/mempolicy.c:2292
 alloc_slab_page mm/slub.c:1870 [inline]
 allocate_slab+0x251/0x380 mm/slub.c:2017
 new_slab mm/slub.c:2070 [inline]
 ___slab_alloc+0x8c7/0x1580 mm/slub.c:3223
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
 __slab_alloc_node mm/slub.c:3375 [inline]
 slab_alloc_node mm/slub.c:3468 [inline]
 __kmem_cache_alloc_node+0x12c/0x310 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1022 [inline]
 __kmalloc_node_track_caller+0x50/0x100 mm/slab_common.c:1043
 kstrdup+0x3c/0x70 mm/util.c:62
 kstrdup_const+0x5f/0x70 mm/util.c:85
 __kernfs_new_node+0x9c/0x890 fs/kernfs/dir.c:611
 kernfs_new_node+0x94/0x110 fs/kernfs/dir.c:679
 kernfs_create_link+0xcc/0x230 fs/kernfs/symlink.c:39
 sysfs_do_create_link_sd+0x90/0x140 fs/sysfs/symlink.c:44
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888106773800: fc fc fc fc 06 fc fc fc fc fa fc fc fc fc 06 fc
 ffff888106773880: fc fc fc 06 fc fc fc fc 07 fc fc fc fc 00 fc fc
>ffff888106773900: fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc
                                     ^
 ffff888106773980: fc 06 fc fc fc fc 05 fc fc fc fc fc fc fc fc fc
 ffff888106773a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================