================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe8/0x110 lib/list_debug.c:62 Read of size 8 at addr ffff88807b85dcd0 by task syz-executor.3/26461 CPU: 1 PID: 26461 Comm: syz-executor.3 Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 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/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 __list_del_entry_valid+0xe8/0x110 lib/list_debug.c:62 __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_close_sync+0x55d/0x1130 net/bluetooth/hci_sync.c:4476 hci_dev_do_close+0x2d/0x70 net/bluetooth/hci_core.c:554 hci_rfkill_set_block+0x15d/0x1c0 net/bluetooth/hci_core.c:947 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:345 rfkill_fop_write+0x2c3/0x570 net/rfkill/core.c:1286 vfs_write+0x2d7/0xdd0 fs/read_write.c:576 ksys_write+0x1e8/0x250 fs/read_write.c:631 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: 0033:0x7fc3e4a89409 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:00007fc3e5be9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc3e4b9bf80 RCX: 00007fc3e4a89409 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000007 RBP: 00007fc3e4ae4367 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc3e50cfb1f R14: 00007fc3e5be9300 R15: 0000000000022000 Allocated by task 21051: 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+0xa9/0xd0 mm/kasan/common.c:525 kmalloc include/linux/slab.h:605 [inline] sock_kmalloc+0xae/0x100 net/core/sock.c:2566 ____sys_sendmsg+0x643/0x810 net/socket.c:2455 __sys_sendmsg_sock+0x26/0x30 net/socket.c:2548 io_sendmsg+0x246/0x7d0 io_uring/net.c:289 io_issue_sqe+0x6b6/0xd20 io_uring/io_uring.c:1577 io_queue_sqe io_uring/io_uring.c:1755 [inline] io_submit_sqe io_uring/io_uring.c:2013 [inline] io_submit_sqes+0x94e/0x1d30 io_uring/io_uring.c:2124 __do_sys_io_uring_enter+0xb85/0x1ea0 io_uring/io_uring.c:3054 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 The buggy address belongs to the object at ffff88807b85dc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 208 bytes inside of 512-byte region [ffff88807b85dc00, ffff88807b85de00) The buggy address belongs to the physical page: page:ffffea0001ee1700 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807b85d400 pfn:0x7b85c head:ffffea0001ee1700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00008e2c08 ffffea0001f57a08 ffff888011841c80 raw: ffff88807b85d400 0000000000100001 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 21, tgid 21 (ksoftirqd/1), ts 50899676500, free_ts 27610395426 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+0x1a6/0x270 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x7f1/0xe10 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] __kmalloc_node_track_caller+0x2f2/0x380 mm/slub.c:4955 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434 __napi_alloc_skb+0x93/0x340 net/core/skbuff.c:575 napi_alloc_skb include/linux/skbuff.h:3207 [inline] page_to_skb+0x17d/0xc10 drivers/net/virtio_net.c:496 receive_mergeable drivers/net/virtio_net.c:1119 [inline] receive_buf+0xe0a/0x5560 drivers/net/virtio_net.c:1258 virtnet_receive drivers/net/virtio_net.c:1553 [inline] virtnet_poll+0x708/0x1310 drivers/net/virtio_net.c:1671 __napi_poll+0xb3/0x6d0 net/core/dev.c:6511 napi_poll net/core/dev.c:6578 [inline] net_rx_action+0x9c1/0xd90 net/core/dev.c:6689 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2548 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3268 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags+0x9a/0xe0 include/linux/audit.h:320 vfs_fstatat+0x73/0xb0 fs/stat.c:254 __do_sys_newfstatat+0x91/0x110 fs/stat.c:425 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 Memory state around the buggy address: ffff88807b85db80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807b85dc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807b85dc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b85dd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b85dd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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