================================================================== 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+0x68/0x2b0 net/bluetooth/sco.c:88 Write of size 4 at addr ffff88801b5ae080 by task kworker/0:2/3323 CPU: 0 PID: 3323 Comm: kworker/0:2 Not tainted 6.7.0-rc6-syzkaller-00022-g55cb5f43689d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 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+0x68/0x2b0 net/bluetooth/sco.c:88 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627 process_scheduled_works kernel/workqueue.c:2700 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Allocated by task 5250: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0x59/0x90 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] sk_prot_alloc+0x1a4/0x2a0 net/core/sock.c:2075 sk_alloc+0x36/0xb80 net/core/sock.c:2128 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:495 [inline] sco_sock_create+0xe3/0x3b0 net/bluetooth/sco.c:526 bt_sock_create+0x180/0x340 net/bluetooth/af_bluetooth.c:132 __sock_create+0x328/0x800 net/socket.c:1569 sock_create net/socket.c:1620 [inline] __sys_socket_create net/socket.c:1657 [inline] __sys_socket+0x14c/0x260 net/socket.c:1704 __do_sys_socket net/socket.c:1718 [inline] __se_sys_socket net/socket.c:1716 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1716 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 5251: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x138/0x190 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] __cache_free mm/slab.c:3370 [inline] __do_kmem_cache_free mm/slab.c:3557 [inline] __kmem_cache_free+0xcc/0x3d0 mm/slab.c:3564 sk_prot_free net/core/sock.c:2111 [inline] __sk_destruct+0x5e1/0x740 net/core/sock.c:2203 sk_destruct+0xc2/0xf0 net/core/sock.c:2218 __sk_free+0xf4/0x3e0 net/core/sock.c:2229 sk_free+0x7c/0xa0 net/core/sock.c:2240 sock_put include/net/sock.h:1990 [inline] sco_sock_kill net/bluetooth/sco.c:426 [inline] sco_sock_kill+0x19d/0x1c0 net/bluetooth/sco.c:416 sco_sock_release+0x154/0x2c0 net/bluetooth/sco.c:1256 __sock_release+0xae/0x260 net/socket.c:659 sock_close+0x1c/0x20 net/socket.c:1419 __fput+0x270/0xb70 fs/file_table.c:394 task_work_run+0x14d/0x240 kernel/task_work.c:180 get_signal+0x106f/0x2790 kernel/signal.c:2680 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff88801b5ae000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff88801b5ae000, ffff88801b5ae800) The buggy address belongs to the physical page: page:ffffea00006d6b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b5ae flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x1() raw: 00fff00000000800 ffff888013040800 ffffea000064ce90 ffffea000069c210 raw: 0000000000000000 ffff88801b5ae000 0000000100000001 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 0x242020(__GFP_HIGH|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 5250, tgid 5249 (syz-executor364), ts 112966112983, free_ts 112528491420 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568 __alloc_pages_node include/linux/gfp.h:238 [inline] kmem_getpages mm/slab.c:1356 [inline] cache_grow_begin+0x99/0x3a0 mm/slab.c:2550 cache_alloc_refill+0x295/0x3b0 mm/slab.c:2923 ____cache_alloc mm/slab.c:2999 [inline] ____cache_alloc mm/slab.c:2982 [inline] __do_cache_alloc mm/slab.c:3182 [inline] slab_alloc_node mm/slab.c:3230 [inline] __kmem_cache_alloc_node+0x3ba/0x460 mm/slab.c:3521 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0x49/0x90 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] sk_prot_alloc+0x1a4/0x2a0 net/core/sock.c:2075 sk_alloc+0x36/0xb80 net/core/sock.c:2128 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:495 [inline] sco_sock_create+0xe3/0x3b0 net/bluetooth/sco.c:526 bt_sock_create+0x180/0x340 net/bluetooth/af_bluetooth.c:132 __sock_create+0x328/0x800 net/socket.c:1569 sock_create net/socket.c:1620 [inline] __sys_socket_create net/socket.c:1657 [inline] __sys_socket+0x14c/0x260 net/socket.c:1704 __do_sys_socket net/socket.c:1718 [inline] __se_sys_socket net/socket.c:1716 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1716 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 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+0x4fa/0xaa0 mm/page_alloc.c:2347 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487 __folio_put_small mm/swap.c:106 [inline] __folio_put+0xc3/0x110 mm/swap.c:129 folio_put include/linux/mm.h:1483 [inline] put_page include/linux/mm.h:1552 [inline] free_page_and_swap_cache+0x25a/0x2d0 mm/swap_state.c:304 __tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline] __tlb_remove_table_free mm/mmu_gather.c:154 [inline] tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:209 rcu_do_batch kernel/rcu/tree.c:2158 [inline] rcu_core+0x819/0x1680 kernel/rcu/tree.c:2431 __do_softirq+0x21a/0x8de kernel/softirq.c:553 Memory state around the buggy address: ffff88801b5adf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801b5ae000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801b5ae080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801b5ae100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801b5ae180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================