================================================================== 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:182 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:239 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:256 [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:195 Write of size 4 at addr ffff888027740080 by task syz-executor.2/14354 CPU: 0 PID: 14354 Comm: syz-executor.2 Not tainted 6.8.0-rc6-syzkaller-02004-g4166204d7ec2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 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:182 [inline] __refcount_inc include/linux/refcount.h:239 [inline] refcount_inc include/linux/refcount.h:256 [inline] sock_hold include/net/sock.h:774 [inline] sco_conn_del+0xa5/0x310 net/bluetooth/sco.c:195 hci_disconn_cfm include/net/bluetooth/hci_core.h:2001 [inline] hci_conn_hash_flush+0xff/0x240 net/bluetooth/hci_conn.c:2645 hci_dev_close_sync+0x9ab/0xff0 net/bluetooth/hci_sync.c:4957 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_unregister_dev+0x1e3/0x4e0 net/bluetooth/hci_core.c:2740 vhci_release+0x83/0xd0 drivers/bluetooth/hci_vhci.c:674 __fput+0x429/0x8a0 fs/file_table.c:376 task_work_run+0x24e/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa2c/0x2740 kernel/exit.c:871 do_group_exit+0x206/0x2c0 kernel/exit.c:1020 get_signal+0x176d/0x1850 kernel/signal.c:2893 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc8/0x360 kernel/entry/common.c:212 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7ff0faa7f94a Code: Unable to access opcode bytes at 0x7ff0faa7f920. RSP: 002b:00007fff4c67aea8 EFLAGS: 00000242 ORIG_RAX: 0000000000000037 RAX: 0000000000000000 RBX: 00007fff4c67aed0 RCX: 00007ff0faa7f94a RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007fff4c67aecc R09: 0079746972756365 R10: 00007fff4c67aed0 R11: 0000000000000242 R12: 00007ff0fab7bf80 R13: 00007fff4c67aecc R14: 0000000000000000 R15: 00007ff0fab7cd00 Allocated by task 14415: 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:3981 [inline] __kmalloc+0x22e/0x490 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2079 sk_alloc+0x38/0x370 net/core/sock.c:2132 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:495 [inline] sco_sock_create+0xbb/0x390 net/bluetooth/sco.c:526 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x48f/0x920 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x14f/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_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 14416: 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:589 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:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 sk_prot_free net/core/sock.c:2115 [inline] __sk_destruct+0x476/0x5f0 net/core/sock.c:2207 sco_sock_release+0x25d/0x320 net/bluetooth/sco.c:1256 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x429/0x8a0 fs/file_table.c:376 task_work_run+0x24e/0x310 kernel/task_work.c:180 get_signal+0x1672/0x1850 kernel/signal.c:2669 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc8/0x360 kernel/entry/common.c:212 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff888027740000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff888027740000, ffff888027740800) The buggy address belongs to the physical page: page:ffffea00009dd000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27740 head:ffffea00009dd000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014c42000 0000000000000000 dead000000000001 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 16280654962, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __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:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node+0x2d6/0x4e0 mm/slub.c:3988 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x72/0x190 mm/util.c:617 kvmalloc include/linux/slab.h:728 [inline] kvzalloc include/linux/slab.h:736 [inline] v4l2_ctrl_new+0xfcf/0x1910 drivers/media/v4l2-core/v4l2-ctrls-core.c:1967 v4l2_ctrl_new_custom+0x6fe/0xa20 drivers/media/v4l2-core/v4l2-ctrls-core.c:2037 vivid_create_controls+0xda9/0x3580 drivers/media/test-drivers/vivid/vivid-ctrls.c:1684 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1854 [inline] vivid_probe+0x4289/0x6fa0 drivers/media/test-drivers/vivid/vivid-core.c:2018 platform_probe+0x13a/0x1c0 drivers/base/platform.c:1404 really_probe+0x29e/0xc50 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x3e0 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 page_owner free stack trace missing Memory state around the buggy address: ffff88802773ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027740000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027740080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027740100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027740180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================