================================================================== 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/linux/atomic/atomic-instrumented.h:116 [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:712 [inline] BUG: KASAN: use-after-free in sco_sock_timeout+0x64/0x290 net/bluetooth/sco.c:89 Write of size 4 at addr ffff8880751bc080 by task kworker/1:1/25 CPU: 1 PID: 25 Comm: kworker/1:1 Not tainted 5.17.0-rc7-syzkaller-00208-g0f74b29a4f53 #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+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 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/linux/atomic/atomic-instrumented.h:116 [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:712 [inline] sco_sock_timeout+0x64/0x290 net/bluetooth/sco.c:89 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 3615: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:586 [inline] sk_prot_alloc+0x110/0x290 net/core/sock.c:1923 sk_alloc+0x32/0xa80 net/core/sock.c:1976 sco_sock_alloc.constprop.0+0x31/0x330 net/bluetooth/sco.c:483 sco_sock_create+0xd5/0x1b0 net/bluetooth/sco.c:522 bt_sock_create+0x17c/0x340 net/bluetooth/af_bluetooth.c:130 __sock_create+0x353/0x790 net/socket.c:1468 sock_create net/socket.c:1519 [inline] __sys_socket+0xef/0x200 net/socket.c:1561 __do_sys_socket net/socket.c:1570 [inline] __se_sys_socket net/socket.c:1568 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1568 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 Freed by task 3616: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xd0/0x390 mm/slub.c:4562 sk_prot_free net/core/sock.c:1959 [inline] __sk_destruct+0x6c0/0x920 net/core/sock.c:2045 sk_destruct+0x131/0x180 net/core/sock.c:2063 __sk_free+0xef/0x3d0 net/core/sock.c:2074 sk_free+0x78/0xa0 net/core/sock.c:2085 sock_put include/net/sock.h:1912 [inline] sco_sock_kill+0x18d/0x1b0 net/bluetooth/sco.c:403 sco_sock_release+0x155/0x2c0 net/bluetooth/sco.c:1259 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x18/0x20 net/socket.c:1318 __fput+0x286/0x9f0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 get_signal+0x1de2/0x2490 kernel/signal.c:2631 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8880751bc000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff8880751bc000, ffff8880751bc800) The buggy address belongs to the page: page:ffffea0001d46e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x751b8 head:ffffea0001d46e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888010c42000 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 3609, ts 118382707364, free_ts 41122176007 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x27f/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0xbe1/0x12b0 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc_track_caller+0x35a/0x430 mm/slub.c:4926 kmemdup+0x23/0x50 mm/util.c:128 kmemdup include/linux/fortify-string.h:304 [inline] neigh_sysctl_register+0x9a/0x5e0 net/core/neighbour.c:3731 addrconf_sysctl_register+0xb6/0x1d0 net/ipv6/addrconf.c:7093 ipv6_add_dev net/ipv6/addrconf.c:455 [inline] ipv6_add_dev+0x994/0x11a0 net/ipv6/addrconf.c:375 addrconf_notify+0x60e/0x1ba0 net/ipv6/addrconf.c:3523 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] register_netdevice+0x10df/0x1580 net/core/dev.c:9698 register_netdev+0x2d/0x50 net/core/dev.c:9791 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3404 __put_page+0x193/0x1e0 mm/swap.c:128 folio_put include/linux/mm.h:1199 [inline] put_page include/linux/mm.h:1237 [inline] __skb_frag_unref include/linux/skbuff.h:3178 [inline] skb_release_data+0x49d/0x760 net/core/skbuff.c:672 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x46/0x60 net/core/skbuff.c:756 __sk_defer_free_flush net/ipv4/tcp.c:1601 [inline] sk_defer_free_flush include/net/tcp.h:1379 [inline] tcp_recvmsg+0x1ca/0x610 net/ipv4/tcp.c:2577 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:948 [inline] sock_recvmsg net/socket.c:966 [inline] sock_recvmsg net/socket.c:962 [inline] sock_read_iter+0x33c/0x470 net/socket.c:1039 call_read_iter include/linux/fs.h:2068 [inline] new_sync_read+0x5c2/0x6e0 fs/read_write.c:400 vfs_read+0x35c/0x600 fs/read_write.c:481 ksys_read+0x1ee/0x250 fs/read_write.c:619 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: ffff8880751bbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880751bc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880751bc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880751bc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880751bc180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================