================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:777 [inline] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 Write of size 4 at addr ffff8880757a8080 by task kworker/0:2/782 CPU: 0 PID: 782 Comm: kworker/0:2 Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x170 mm/kasan/report.c:588 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:777 [inline] sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2700 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2781 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Allocated by task 5073: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb3/0x1a0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2075 sk_alloc+0x38/0x370 net/core/sock.c:2128 bt_sock_alloc+0x3c/0x330 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:495 [inline] sco_sock_create+0xbb/0x380 net/bluetooth/sco.c:526 bt_sock_create+0x15d/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x48c/0x910 net/socket.c:1569 sock_create net/socket.c:1620 [inline] __sys_socket_create net/socket.c:1657 [inline] __sys_socket+0x14f/0x3b0 net/socket.c:1704 __do_sys_socket net/socket.c:1718 [inline] __se_sys_socket net/socket.c:1716 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1716 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 5074: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0x263/0x3a0 mm/slub.c:3822 sk_prot_free net/core/sock.c:2111 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2203 sco_sock_release+0x25d/0x320 net/bluetooth/sco.c:1256 __sock_release net/socket.c:659 [inline] sock_close+0xb8/0x230 net/socket.c:1419 __fput+0x3cc/0x9e0 fs/file_table.c:394 task_work_run+0x24a/0x300 kernel/task_work.c:180 get_signal+0x166e/0x1840 kernel/signal.c:2680 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff8880757a8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff8880757a8000, ffff8880757a8800) The buggy address belongs to the physical page: page:ffffea0001d5ea00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x757a8 head:ffffea0001d5ea00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888012c42000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000080008 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5073, tgid 5072 (syz-executor401), ts 78091738532, free_ts 25320043675 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 alloc_slab_page+0x6a/0x170 mm/slub.c:1870 allocate_slab mm/slub.c:2017 [inline] new_slab+0x84/0x2f0 mm/slub.c:2070 ___slab_alloc+0xc8a/0x1330 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x21d/0x300 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa2/0x1a0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2075 sk_alloc+0x38/0x370 net/core/sock.c:2128 bt_sock_alloc+0x3c/0x330 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:495 [inline] sco_sock_create+0xbb/0x380 net/bluetooth/sco.c:526 bt_sock_create+0x15d/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x48c/0x910 net/socket.c:1569 sock_create net/socket.c:1620 [inline] __sys_socket_create net/socket.c:1657 [inline] __sys_socket+0x14f/0x3b0 net/socket.c:1704 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 free_contig_range+0x9e/0x160 mm/page_alloc.c:6536 destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x4ba/0x540 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x234/0x810 init/main.c:1236 do_initcall_level+0x157/0x210 init/main.c:1298 do_initcalls+0x3f/0x80 init/main.c:1314 kernel_init_freeable+0x429/0x5c0 init/main.c:1551 kernel_init+0x1d/0x2a0 init/main.c:1441 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Memory state around the buggy address: ffff8880757a7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880757a8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880757a8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880757a8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880757a8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================