================================================================== BUG: KASAN: slab-use-after-free in vhci_send_cmd_submit+0xed2/0x10c0 drivers/usb/usbip/vhci_tx.c:91 Read of size 4 at addr ffff888022a66584 by task vhci_tx/6044 CPU: 0 UID: 0 PID: 6044 Comm: vhci_tx Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 vhci_send_cmd_submit+0xed2/0x10c0 drivers/usb/usbip/vhci_tx.c:91 vhci_tx_loop+0xff/0x460 drivers/usb/usbip/vhci_tx.c:241 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 6031: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_noprof+0x322/0x820 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] usb_alloc_urb+0x66/0xa0 drivers/usb/core/urb.c:75 alloc_async drivers/usb/core/devio.c:408 [inline] proc_do_submiturb+0x741/0x3820 drivers/usb/core/devio.c:1780 proc_submiturb drivers/usb/core/devio.c:2002 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2702 [inline] usbdev_ioctl+0x2adb/0x3aa0 drivers/usb/core/devio.c:2826 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6031: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x22b/0x6c0 mm/slub.c:6692 urb_destroy drivers/usb/core/urb.c:27 [inline] kref_put include/linux/kref.h:65 [inline] usb_free_urb.part.0+0xa5/0x110 drivers/usb/core/urb.c:96 usb_free_urb+0x1f/0x30 drivers/usb/core/urb.c:95 free_async+0x358/0x530 drivers/usb/core/devio.c:435 proc_reapurbnonblock drivers/usb/core/devio.c:2129 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2621 [inline] usbdev_ioctl+0x2e7/0x3aa0 drivers/usb/core/devio.c:2826 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888022a66500 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 132 bytes inside of freed 192-byte region [ffff888022a66500, ffff888022a665c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22a66 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801c0423c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 5964583883, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x640 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] acpi_os_map_iomem+0x138/0x5e0 drivers/acpi/osl.c:353 acpi_ex_system_memory_space_handler+0x4e8/0xbb0 drivers/acpi/acpica/exregion.c:145 acpi_ev_address_space_dispatch+0x4d2/0xf00 drivers/acpi/acpica/evregion.c:295 acpi_ex_access_region+0x6e1/0xe00 drivers/acpi/acpica/exfldio.c:246 acpi_ex_field_datum_io+0x168/0xe40 drivers/acpi/acpica/exfldio.c:445 acpi_ex_write_with_update_rule+0x2b1/0x4b0 drivers/acpi/acpica/exfldio.c:627 acpi_ex_insert_into_field+0x672/0x870 drivers/acpi/acpica/exfldio.c:957 acpi_ex_write_data_to_field+0x23a/0xb20 drivers/acpi/acpica/exfield.c:401 acpi_ex_store_object_to_node+0x3f0/0x790 drivers/acpi/acpica/exstore.c:523 page_owner free stack trace missing Memory state around the buggy address: ffff888022a66480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888022a66500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888022a66580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888022a66600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022a66680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================