================================================================== BUG: KASAN: slab-out-of-bounds in debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] BUG: KASAN: slab-out-of-bounds in do_raw_spin_lock+0x262/0x2b0 kernel/locking/spinlock_debug.c:112 Read of size 4 at addr ffff88802133ce14 by task kworker/0:0/5 CPU: 0 PID: 5 Comm: kworker/0:0 Tainted: G W 5.13.0-next-20210708-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x262/0x2b0 kernel/locking/spinlock_debug.c:112 do_wait_for_common kernel/sched/completion.c:86 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x181/0x280 kernel/sched/completion.c:138 r871xu_dev_remove+0x80/0x320 drivers/staging/rtl8712/usb_intf.c:599 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458 __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1201 device_release_driver_internal drivers/base/dd.c:1232 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1255 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529 device_del+0x502/0xd40 drivers/base/core.c:3544 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419 usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2221 hub_port_connect drivers/usb/core/hub.c:5151 [inline] hub_port_connect_change drivers/usb/core/hub.c:5440 [inline] port_event drivers/usb/core/hub.c:5586 [inline] hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5668 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 8721: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:587 kvmalloc include/linux/mm.h:806 [inline] seq_buf_alloc fs/seq_file.c:35 [inline] seq_read_iter+0x78f/0x11e0 fs/seq_file.c:207 kernfs_fop_read_iter+0x44f/0x5f0 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2146 [inline] new_sync_read+0x41e/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 8721: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:229 [inline] slab_free_hook mm/slub.c:1650 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1675 slab_free mm/slub.c:3235 [inline] kfree+0xeb/0x650 mm/slub.c:4295 kvfree+0x42/0x50 mm/util.c:616 seq_release+0x4f/0x80 fs/seq_file.c:352 kernfs_fop_release+0xee/0x190 fs/kernfs/file.c:761 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802133c000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3604 bytes inside of 4096-byte region [ffff88802133c000, ffff88802133d000) The buggy address belongs to the page: page:ffffea000084ce00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21338 head:ffffea000084ce00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801084c280 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8723, ts 72820106937, free_ts 72816600549 prep_new_page mm/page_alloc.c:2444 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4177 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5385 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1713 [inline] allocate_slab+0x32b/0x4c0 mm/slub.c:1853 new_slab mm/slub.c:1916 [inline] new_slab_objects mm/slub.c:2662 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2825 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2865 slab_alloc_node mm/slub.c:2947 [inline] __kmalloc_node+0x2df/0x380 mm/slub.c:4181 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:587 kvmalloc include/linux/mm.h:806 [inline] seq_buf_alloc fs/seq_file.c:35 [inline] seq_read_iter+0x78f/0x11e0 fs/seq_file.c:207 kernfs_fop_read_iter+0x44f/0x5f0 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2146 [inline] new_sync_read+0x41e/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1354 [inline] free_pcp_prepare+0x312/0x7d0 mm/page_alloc.c:1405 free_unref_page_prepare mm/page_alloc.c:3340 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3419 kvfree+0x42/0x50 mm/util.c:616 netdev_freemem net/core/dev.c:10764 [inline] free_netdev+0x495/0x5b0 net/core/dev.c:10942 rtl871x_load_fw_cb drivers/staging/rtl8712/hal_init.c:46 [inline] rtl871x_load_fw_cb.cold+0xf7/0x117 drivers/staging/rtl8712/hal_init.c:32 request_firmware_work_func+0x12c/0x230 drivers/base/firmware_loader/main.c:1081 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88802133cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802133cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802133ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802133ce80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802133cf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================