================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline] BUG: KASAN: use-after-free in enqueue_timer+0x9e/0x2c0 kernel/time/timer.c:541 Write of size 8 at addr ffff8881deabf1c8 by task syz.4.383/1874 CPU: 0 PID: 1874 Comm: syz.4.383 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack+0x1e/0x20 lib/dump_stack.c:77 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384 __kasan_report+0xef/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137 hlist_add_head include/linux/list.h:814 [inline] enqueue_timer+0x9e/0x2c0 kernel/time/timer.c:541 __internal_add_timer kernel/time/timer.c:554 [inline] internal_add_timer+0x208/0x3e0 kernel/time/timer.c:604 __mod_timer+0x5ab/0x1150 kernel/time/timer.c:1065 mod_timer+0x1f/0x30 kernel/time/timer.c:1117 can_pernet_init+0x1e9/0x2e0 net/can/af_can.c:811 ops_init+0x1ba/0x4a0 net/core/net_namespace.c:141 setup_net+0x20c/0x9b0 net/core/net_namespace.c:348 copy_net_ns+0x314/0x520 net/core/net_namespace.c:489 create_new_namespaces+0x49c/0x590 kernel/nsproxy.c:103 copy_namespaces+0x17e/0x1c0 kernel/nsproxy.c:161 copy_process+0x1194/0x2cf0 kernel/fork.c:2055 _do_fork+0x190/0x860 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x12e/0x160 kernel/fork.c:2538 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f6c8f93e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6c8dfa6fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f6c8fb65fa0 RCX: 00007f6c8f93e969 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000640c7000 RBP: 00007f6c8f9c0ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6c8fb65fa0 R15: 00007fffe149c3a8 Allocated by task 1809: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x10d/0x2d0 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] pskb_expand_head+0x123/0x1110 net/core/skbuff.c:1653 skb_ensure_writable+0x2e7/0x460 net/core/skbuff.c:5569 __bpf_try_make_writable net/core/filter.c:1635 [inline] bpf_try_make_writable net/core/filter.c:1641 [inline] bpf_try_make_head_writable net/core/filter.c:1649 [inline] ____bpf_clone_redirect net/core/filter.c:2145 [inline] bpf_clone_redirect+0x10b/0x380 net/core/filter.c:2123 bpf_prog_abe3471d98b428a0+0x3bc/0x1000 bpf_call_func include/linux/filter.h:627 [inline] bpf_test_run+0x1ea/0x5d0 net/bpf/test_run.c:44 bpf_prog_test_run_skb+0x721/0xdc0 net/bpf/test_run.c:311 bpf_prog_test_run+0x21a/0x2a0 kernel/bpf/syscall.c:2124 __do_sys_bpf kernel/bpf/syscall.c:2909 [inline] __se_sys_bpf+0x49a/0x570 kernel/bpf/syscall.c:2849 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 1809: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1c3/0x280 mm/kasan/common.c:487 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0xb7/0x180 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kfree+0xbe/0x260 mm/slub.c:4071 skb_free_head net/core/skbuff.c:601 [inline] skb_release_data+0x4ea/0x610 net/core/skbuff.c:621 skb_release_all net/core/skbuff.c:675 [inline] __kfree_skb net/core/skbuff.c:689 [inline] kfree_skb+0xbc/0x3a0 net/core/skbuff.c:708 kfree_skb_list+0x41/0x70 net/core/skbuff.c:717 __dev_xmit_skb net/core/dev.c:3486 [inline] __dev_queue_xmit+0x163f/0x2400 net/core/dev.c:3787 dev_queue_xmit+0x17/0x20 net/core/dev.c:3854 __bpf_tx_skb net/core/filter.c:2063 [inline] __bpf_redirect_no_mac net/core/filter.c:2097 [inline] __bpf_redirect+0x699/0xe30 net/core/filter.c:2120 ____bpf_clone_redirect net/core/filter.c:2151 [inline] bpf_clone_redirect+0x242/0x380 net/core/filter.c:2123 bpf_prog_abe3471d98b428a0+0x3bc/0x1000 bpf_call_func include/linux/filter.h:627 [inline] bpf_test_run+0x1ea/0x5d0 net/bpf/test_run.c:44 bpf_prog_test_run_skb+0x721/0xdc0 net/bpf/test_run.c:311 bpf_prog_test_run+0x21a/0x2a0 kernel/bpf/syscall.c:2124 __do_sys_bpf kernel/bpf/syscall.c:2909 [inline] __se_sys_bpf+0x49a/0x570 kernel/bpf/syscall.c:2849 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881deabf000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 456 bytes inside of 512-byte region [ffff8881deabf000, ffff8881deabf200) The buggy address belongs to the page: page:ffffea00077aaf00 refcount:1 mapcount:0 mapping:ffff8881f5c02500 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02500 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x35e/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894 alloc_slab_page+0x3c/0x3b0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x93/0x420 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x29e/0x420 mm/slub.c:2667 __slab_alloc+0x63/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x17c/0x2d0 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] pskb_expand_head+0x123/0x1110 net/core/skbuff.c:1653 skb_ensure_writable+0x2e7/0x460 net/core/skbuff.c:5569 __bpf_try_make_writable net/core/filter.c:1635 [inline] bpf_try_make_writable net/core/filter.c:1641 [inline] bpf_try_make_head_writable net/core/filter.c:1649 [inline] ____bpf_clone_redirect net/core/filter.c:2145 [inline] bpf_clone_redirect+0x10b/0x380 net/core/filter.c:2123 bpf_prog_abe3471d98b428a0+0x3bc/0x1000 bpf_call_func include/linux/filter.h:627 [inline] bpf_test_run+0x1ea/0x5d0 net/bpf/test_run.c:44 bpf_prog_test_run_skb+0x721/0xdc0 net/bpf/test_run.c:311 bpf_prog_test_run+0x21a/0x2a0 kernel/bpf/syscall.c:2124 __do_sys_bpf kernel/bpf/syscall.c:2909 [inline] __se_sys_bpf+0x49a/0x570 kernel/bpf/syscall.c:2849 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x7e4/0x910 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4956 [inline] __free_pages+0x8c/0x110 mm/page_alloc.c:4962 kfree+0x1ca/0x260 mm/slub.c:4068 kvfree+0x4c/0x50 mm/util.c:625 netdev_freemem+0x3f/0x60 net/core/dev.c:9583 netdev_release+0x7f/0xb0 net/core/net-sysfs.c:1743 device_release+0x70/0x1a0 drivers/base/core.c:1776 kobject_cleanup lib/kobject.c:716 [inline] kobject_release lib/kobject.c:747 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1fe/0x2c0 lib/kobject.c:764 netdev_run_todo+0xae4/0xc70 net/core/dev.c:9488 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112 tun_detach drivers/net/tun.c:766 [inline] tun_chr_close+0xc4/0x140 drivers/net/tun.c:3563 __fput+0x2a3/0x730 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x146/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x195/0x1b0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194 Memory state around the buggy address: ffff8881deabf080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881deabf100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881deabf180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881deabf200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881deabf280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================