================================================================== 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:184 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:241 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:258 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:774 [inline] BUG: KASAN: slab-use-after-free in sco_conn_del+0xa5/0x310 net/bluetooth/sco.c:199 Write of size 4 at addr ffff8880303ec080 by task syz-executor.0/5649 CPU: 1 PID: 5649 Comm: syz-executor.0 Not tainted 6.9.0-rc7-syzkaller-01844-gcddd2dc6390b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 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:184 [inline] __refcount_inc include/linux/refcount.h:241 [inline] refcount_inc include/linux/refcount.h:258 [inline] sock_hold include/net/sock.h:774 [inline] sco_conn_del+0xa5/0x310 net/bluetooth/sco.c:199 hci_disconn_cfm include/net/bluetooth/hci_core.h:2028 [inline] hci_conn_hash_flush+0xff/0x240 net/bluetooth/hci_conn.c:2568 hci_dev_close_sync+0x9ab/0x1050 net/bluetooth/hci_sync.c:5159 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_unregister_dev+0x1db/0x4e0 net/bluetooth/hci_core.c:2771 vhci_release+0x83/0xd0 drivers/bluetooth/hci_vhci.c:674 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x16a1/0x1740 kernel/signal.c:2911 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f882507ca0c Code: Unable to access opcode bytes at 0x7f882507c9e2. RSP: 002b:00007ffcaab2e420 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f882507ca0c RDX: 0000000000000040 RSI: 00007f88251a8020 RDI: 00000000000000f9 RBP: 00007ffcaab2e4ac R08: 0000000000000000 R09: 0079746972756365 R10: 00007f882517c6a0 R11: 0000000000000246 R12: 0000000000000032 R13: 0000000000023707 R14: 00000000000236b5 R15: 0000000000000003 Allocated by task 5680: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3972 [inline] __kmalloc+0x233/0x4a0 mm/slub.c:3985 kmalloc include/linux/slab.h:632 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2080 sk_alloc+0x38/0x370 net/core/sock.c:2133 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:500 [inline] sco_sock_create+0xbb/0x390 net/bluetooth/sco.c:531 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x490/0x920 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1706 __do_sys_socket net/socket.c:1720 [inline] __se_sys_socket net/socket.c:1718 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1718 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5683: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2111 [inline] slab_free mm/slub.c:4286 [inline] kfree+0x153/0x3b0 mm/slub.c:4396 sk_prot_free net/core/sock.c:2116 [inline] __sk_destruct+0x476/0x5f0 net/core/sock.c:2208 sco_sock_release+0x25e/0x320 net/bluetooth/sco.c:1259 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x16a1/0x1740 kernel/signal.c:2911 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880303ec000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff8880303ec000, ffff8880303ec800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880303ef000 pfn:0x303e8 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000a40(workingset|slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000a40 ffff888015042000 ffffea0001946010 ffffea0001a10210 raw: ffff8880303ef000 0000000000080006 00000001ffffffff 0000000000000000 head: 00fff00000000a40 ffff888015042000 ffffea0001946010 ffffea0001a10210 head: ffff8880303ef000 0000000000080006 00000001ffffffff 0000000000000000 head: 00fff00000000003 ffffea0000c0fa01 dead000000000122 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 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 926, tgid -2999210 (kworker/0:2), ts 926, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2180 allocate_slab mm/slub.c:2343 [inline] new_slab+0x84/0x2f0 mm/slub.c:2396 ___slab_alloc+0xc73/0x1260 mm/slub.c:3530 __slab_alloc mm/slub.c:3615 [inline] __slab_alloc_node mm/slub.c:3668 [inline] slab_alloc_node mm/slub.c:3841 [inline] kmalloc_trace+0x269/0x370 mm/slub.c:3998 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] fw_create_instance+0x5d/0x180 drivers/base/firmware_loader/sysfs.c:402 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:155 [inline] firmware_fallback_sysfs+0x1fa/0x9e0 drivers/base/firmware_loader/fallback.c:238 _request_firmware+0xcf5/0x12b0 drivers/base/firmware_loader/main.c:914 request_firmware_work_func+0x12a/0x280 drivers/base/firmware_loader/main.c:1165 process_one_work kernel/workqueue.c:3267 [inline] process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3348 worker_thread+0x86d/0xd70 kernel/workqueue.c:3429 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page_owner free stack trace missing Memory state around the buggy address: ffff8880303ebf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880303ec000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880303ec080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880303ec100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880303ec180: fb fb fb fb fb fb 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