================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:111 [inline] BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: use-after-free in sock_hold include/net/sock.h:701 [inline] BUG: KASAN: use-after-free in sco_sock_timeout+0x54/0x1e0 net/bluetooth/sco.c:88 Write of size 4 at addr ffff8880208f8080 by task kworker/0:4/8782 CPU: 0 PID: 8782 Comm: kworker/0:4 Not tainted 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:111 [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:701 [inline] sco_sock_timeout+0x54/0x1e0 net/bluetooth/sco.c:88 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2276 worker_thread+0x598/0x1040 kernel/workqueue.c:2422 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 17656: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0xee/0x200 net/core/sock.c:1808 sk_alloc+0x27/0x8c0 net/core/sock.c:1861 sco_sock_alloc.constprop.0+0x22/0x200 net/bluetooth/sco.c:491 sco_sock_create+0xb1/0x160 net/bluetooth/sco.c:526 bt_sock_create+0x142/0x2e0 net/bluetooth/af_bluetooth.c:130 __sock_create+0x23e/0x590 net/socket.c:1450 sock_create net/socket.c:1501 [inline] __sys_socket+0xd6/0x1a0 net/socket.c:1543 __do_sys_socket net/socket.c:1552 [inline] __se_sys_socket net/socket.c:1550 [inline] __x64_sys_socket+0x6a/0xb0 net/socket.c:1550 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8880208f8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff8880208f8000, ffff8880208f8800) The buggy address belongs to the page: page:ffffea0000823e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880208fd000 pfn:0x208f8 head:ffffea0000823e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000a25408 ffffea0000c57408 ffff88800fc42000 raw: ffff8880208fd000 0000000000080002 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8951, ts 59508411700, free_ts 59459511433 prep_new_page mm/page_alloc.c:2433 [inline] get_page_from_freelist+0xa6f/0x2f50 mm/page_alloc.c:4166 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374 alloc_slab_page mm/slub.c:1713 [inline] allocate_slab+0x32b/0x4c0 mm/slub.c:1853 new_slab mm/slub.c:1916 [inline] new_slab_objects mm/slub.c:2662 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2825 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2865 slab_alloc_node mm/slub.c:2947 [inline] __kmalloc_node_track_caller+0x2e3/0x360 mm/slub.c:4681 kmalloc_reserve net/core/skbuff.c:355 [inline] pskb_expand_head+0x11f/0xf50 net/core/skbuff.c:1685 netlink_trim+0x18f/0x1f0 net/netlink/af_netlink.c:1296 netlink_broadcast_filtered+0x58/0xac0 net/netlink/af_netlink.c:1501 netlink_broadcast net/netlink/af_netlink.c:1546 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x6a/0x1d0 net/netlink/af_netlink.c:2547 __dev_notify_flags+0x18d/0x220 net/core/dev.c:8847 dev_change_flags+0xf6/0x150 net/core/dev.c:8889 do_setlink+0x7d7/0x2cb0 net/core/rtnetlink.c:2714 __rtnl_newlink+0xaca/0x13b0 net/core/rtnetlink.c:3386 rtnl_newlink+0x5a/0x90 net/core/rtnetlink.c:3501 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5567 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1343 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1394 free_unref_page_prepare mm/page_alloc.c:3329 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3408 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2443 put_cpu_partial+0x13d/0x230 mm/slub.c:2479 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2981 [inline] slab_alloc mm/slub.c:2989 [inline] kmem_cache_alloc_trace+0x26d/0x3c0 mm/slub.c:3006 kmalloc include/linux/slab.h:591 [inline] tomoyo_print_header security/tomoyo/audit.c:156 [inline] tomoyo_init_log+0x183/0x1cf0 security/tomoyo/audit.c:255 tomoyo_supervisor+0x2fc/0xc40 security/tomoyo/common.c:2097 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x38a/0x4d0 security/tomoyo/file.c:734 security_file_ioctl+0x44/0x80 security/security.c:1539 __do_sys_ioctl fs/ioctl.c:1063 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x99/0x190 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff8880208f7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880208f8000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880208f8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880208f8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880208f8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================