================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925 Read of size 8 at addr ffff8880206c5130 by task syz-executor.0/7661 CPU: 1 PID: 7661 Comm: syz-executor.0 Not tainted 6.1.0-rc6-next-20221125-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:253 [inline] print_report+0x15e/0x45d mm/kasan/report.c:364 kasan_report+0xbf/0x1f0 mm/kasan/report.c:464 __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3462 lock_sock include/net/sock.h:1721 [inline] nr_accept+0x377/0x650 net/netrom/af_netrom.c:805 do_accept+0x380/0x510 net/socket.c:1856 __sys_accept4_file net/socket.c:1897 [inline] __sys_accept4+0x9a/0x120 net/socket.c:1927 __do_sys_accept net/socket.c:1944 [inline] __se_sys_accept net/socket.c:1941 [inline] __x64_sys_accept+0x75/0xb0 net/socket.c:1941 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb284c8c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb285a02168 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: ffffffffffffffda RBX: 00007fb284dac050 RCX: 00007fb284c8c0d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007fb284ce7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd16e244f R14: 00007fb285a02300 R15: 0000000000022000 Allocated by task 7648: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:376 [inline] ____kasan_kmalloc mm/kasan/common.c:335 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:385 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0x5a/0xd0 mm/slab_common.c:968 kmalloc include/linux/slab.h:575 [inline] sk_prot_alloc+0x140/0x290 net/core/sock.c:2031 sk_alloc+0x3a/0x7a0 net/core/sock.c:2084 nr_create+0xb6/0x5f0 net/netrom/af_netrom.c:433 __sock_create+0x359/0x790 net/socket.c:1515 sock_create net/socket.c:1566 [inline] __sys_socket_create net/socket.c:1603 [inline] __sys_socket_create net/socket.c:1588 [inline] __sys_socket+0x133/0x250 net/socket.c:1636 __do_sys_socket net/socket.c:1649 [inline] __se_sys_socket net/socket.c:1647 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 21: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:241 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:205 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1763 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1789 slab_free mm/slub.c:3696 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3709 sk_prot_free net/core/sock.c:2067 [inline] __sk_destruct+0x6b5/0x940 net/core/sock.c:2159 sk_destruct net/core/sock.c:2174 [inline] __sk_free+0x175/0x460 net/core/sock.c:2185 sk_free+0x7c/0xa0 net/core/sock.c:2196 sock_put include/net/sock.h:1987 [inline] nr_heartbeat_expiry+0x1d7/0x460 net/netrom/nr_timer.c:148 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x6a2/0xaf0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb7/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2619 netlink_release+0xeca/0x1f10 net/netlink/af_netlink.c:826 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x1c/0x20 net/socket.c:1365 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8880206c5000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 304 bytes inside of 2048-byte region [ffff8880206c5000, ffff8880206c5800) The buggy address belongs to the physical page: page:ffffea000081b000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x206c0 head:ffffea000081b000 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012442000 ffffea0000ee0c00 dead000000000002 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 150, tgid 150 (kworker/0:2), ts 251895049012, free_ts 251675007539 prep_new_page mm/page_alloc.c:2541 [inline] get_page_from_freelist+0x119c/0x2cd0 mm/page_alloc.c:4293 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5551 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1833 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1980 new_slab mm/slub.c:2033 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3211 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3310 slab_alloc_node mm/slub.c:3395 [inline] __kmem_cache_alloc_node+0x1a9/0x430 mm/slub.c:3472 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:438 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:511 alloc_skb include/linux/skbuff.h:1269 [inline] alloc_skb_with_frags+0x97/0x6c0 net/core/skbuff.c:6138 sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2734 sock_alloc_send_skb include/net/sock.h:1884 [inline] mld_newpack.isra.0+0x1b9/0x770 net/ipv6/mcast.c:1748 add_grhead+0x295/0x340 net/ipv6/mcast.c:1851 add_grec+0x1072/0x1550 net/ipv6/mcast.c:1989 mld_send_cr net/ipv6/mcast.c:2115 [inline] mld_ifc_work+0x44d/0xdb0 net/ipv6/mcast.c:2653 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1448 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1498 free_unref_page_prepare mm/page_alloc.c:3379 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3474 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:307 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3433 [inline] __kmem_cache_alloc_node+0x1ec/0x430 mm/slub.c:3472 kmalloc_trace+0x26/0x60 mm/slab_common.c:1049 kmalloc include/linux/slab.h:571 [inline] kzalloc include/linux/slab.h:711 [inline] nsim_fib6_rt_create drivers/net/netdevsim/fib.c:547 [inline] nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:752 [inline] nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline] nsim_fib_event_work+0x121c/0x24a0 drivers/net/netdevsim/fib.c:1492 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 process_scheduled_works kernel/workqueue.c:2352 [inline] worker_thread+0x858/0x1090 kernel/workqueue.c:2438 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff8880206c5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880206c5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880206c5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880206c5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880206c5200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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