================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xf2/0x110 lib/list_debug.c:59 Read of size 8 at addr ffff88801cc790c8 by task syz-executor.0/11446 CPU: 1 PID: 11446 Comm: syz-executor.0 Not tainted 6.0.0-rc6-syzkaller-00045-gdc164f4fb00a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 __list_del_entry_valid+0xf2/0x110 lib/list_debug.c:59 __list_del_entry include/linux/list.h:134 [inline] list_del include/linux/list.h:148 [inline] klist_release+0x66/0x480 lib/klist.c:189 kref_put include/linux/kref.h:65 [inline] klist_dec_and_del lib/klist.c:206 [inline] klist_put+0x151/0x1d0 lib/klist.c:217 device_del+0x46d/0xc80 drivers/base/core.c:3699 hci_conn_del_sysfs+0xdc/0x180 net/bluetooth/hci_sysfs.c:78 hci_conn_cleanup+0x315/0x7b0 net/bluetooth/hci_conn.c:147 hci_conn_del+0x29b/0x790 net/bluetooth/hci_conn.c:1022 hci_conn_hash_flush+0x197/0x260 net/bluetooth/hci_conn.c:2367 hci_dev_do_reset net/bluetooth/hci_core.c:610 [inline] hci_dev_reset+0x1ff/0x4b0 net/bluetooth/hci_core.c:654 hci_sock_ioctl+0x523/0x860 net/bluetooth/hci_sock.c:1044 sock_do_ioctl+0xcc/0x230 net/socket.c:1169 sock_ioctl+0x2f1/0x640 net/socket.c:1286 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x63/0xcd RIP: 0033:0x7f77c248a669 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f77c366f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f77c25abf80 RCX: 00007f77c248a669 RDX: 0000000000000000 RSI: 00000000400448cb RDI: 0000000000000004 RBP: 00007f77c24e5560 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe5a50ba2f R14: 00007f77c366f300 R15: 0000000000022000 Allocated by task 9500: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:525 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x25a/0x460 mm/slab.c:3559 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] ep_alloc.constprop.0+0xfa/0x370 fs/eventpoll.c:944 do_epoll_create+0x97/0x1c0 fs/eventpoll.c:2001 __do_sys_epoll_create1 fs/eventpoll.c:2032 [inline] __se_sys_epoll_create1 fs/eventpoll.c:2030 [inline] __x64_sys_epoll_create1+0x2d/0x40 fs/eventpoll.c:2030 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+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x625/0x1210 kernel/workqueue.c:1517 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x625/0x1210 kernel/workqueue.c:1517 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571 The buggy address belongs to the object at ffff88801cc79000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 200 bytes inside of 512-byte region [ffff88801cc79000, ffff88801cc79200) The buggy address belongs to the physical page: page:ffffea0000731e40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801cc79000 pfn:0x1cc79 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00006c2208 ffffea0000534708 ffff888011840600 raw: ffff88801cc79000 ffff88801cc79000 0000000100000003 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 0x252000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 83, tgid 83 (kworker/u17:4), ts 10922618733, free_ts 0 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 __alloc_pages_node include/linux/gfp.h:243 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x360 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] slab_alloc_node mm/slab.c:3220 [inline] kmem_cache_alloc_node_trace+0x50a/0x570 mm/slab.c:3601 __do_kmalloc_node mm/slab.c:3623 [inline] __kmalloc_node+0x38/0x60 mm/slab.c:3631 kmalloc_node include/linux/slab.h:623 [inline] kzalloc_node include/linux/slab.h:744 [inline] blk_alloc_flush_queue+0x127/0x330 block/blk-flush.c:481 blk_mq_alloc_hctx block/blk-mq.c:3545 [inline] blk_mq_alloc_and_init_hctx+0xc83/0x11e0 block/blk-mq.c:3980 blk_mq_realloc_hw_ctxs+0x43d/0x590 block/blk-mq.c:4013 blk_mq_init_allocated_queue+0x527/0x1570 block/blk-mq.c:4075 blk_mq_init_queue_data block/blk-mq.c:3889 [inline] __blk_mq_alloc_disk+0xd1/0x1f0 block/blk-mq.c:3938 floppy_alloc_disk+0x3d/0x390 drivers/block/floppy.c:4514 do_floppy_init drivers/block/floppy.c:4595 [inline] floppy_async_init+0x316/0x21ca drivers/block/floppy.c:4765 async_run_entry_fn+0x98/0x530 kernel/async.c:127 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 page_owner free stack trace missing Memory state around the buggy address: ffff88801cc78f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801cc79000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801cc79080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801cc79100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801cc79180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================