================================================================== 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_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 Write of size 4 at addr ffff8880253f2080 by task kworker/0:1/9 CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.8.0-rc5-syzkaller-01654-g4ac828960a60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: events sco_sock_timeout 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_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 The buggy address belongs to the object at ffff8880253f2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff8880253f2000, ffff8880253f2800) The buggy address belongs to the physical page: page:ffffea000094fc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880253f6000 pfn:0x253f0 head:ffffea000094fc00 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 ffff888014c42000 ffffea0000b74a10 ffffea000111ee10 raw: ffff8880253f6000 0000000000080001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 18719, tgid 18718 (syz-executor.1), ts 407718043336, free_ts 407557975241 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] kmalloc_trace+0x264/0x360 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] do_check_common+0x190/0x1b10 kernel/bpf/verifier.c:20086 do_check_main kernel/bpf/verifier.c:20256 [inline] bpf_check+0x10f92/0x16680 kernel/bpf/verifier.c:20920 bpf_prog_load+0x166d/0x2100 kernel/bpf/syscall.c:2843 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5573 __do_sys_bpf kernel/bpf/syscall.c:5680 [inline] __se_sys_bpf kernel/bpf/syscall.c:5678 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5678 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 page last free pid 18705 tgid 18702 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 __slab_free+0x349/0x410 mm/slub.c:4211 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:324 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867 kmem_cache_zalloc include/linux/slab.h:701 [inline] alloc_empty_file+0x9e/0x1d0 fs/file_table.c:203 alloc_file+0x5c/0x5f0 fs/file_table.c:290 alloc_file_pseudo+0x1b4/0x250 fs/file_table.c:328 sock_alloc_file+0xb8/0x290 net/socket.c:469 sock_map_fd net/socket.c:494 [inline] __sys_socket+0x1dc/0x3c0 net/socket.c:1715 __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 Memory state around the buggy address: ffff8880253f1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880253f2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880253f2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880253f2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880253f2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================