================================================================== BUG: KASAN: use-after-free in tcp_or_dccp_get_hashinfo include/net/inet_hashtables.h:186 [inline] BUG: KASAN: use-after-free in reqsk_queue_unlink net/ipv4/inet_connection_sock.c:956 [inline] BUG: KASAN: use-after-free in inet_csk_reqsk_queue_drop+0xdc/0x384 net/ipv4/inet_connection_sock.c:970 Read of size 8 at addr ffff0000dbd8d9c0 by task syz-executor.2/12412 CPU: 0 PID: 12412 Comm: syz-executor.2 Not tainted 6.1.82-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 tcp_or_dccp_get_hashinfo include/net/inet_hashtables.h:186 [inline] reqsk_queue_unlink net/ipv4/inet_connection_sock.c:956 [inline] inet_csk_reqsk_queue_drop+0xdc/0x384 net/ipv4/inet_connection_sock.c:970 inet_csk_reqsk_queue_drop_and_put net/ipv4/inet_connection_sock.c:982 [inline] reqsk_timer_handler+0x704/0xd48 net/ipv4/inet_connection_sock.c:1096 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers+0x554/0x718 kernel/time/timer.c:1790 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1803 __do_softirq+0x314/0xe38 kernel/softirq.c:571 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:650 irq_exit_rcu+0x14/0x84 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 preempt_count arch/arm64/include/asm/preempt.h:13 [inline] check_kcov_mode kernel/kcov.c:173 [inline] __sanitizer_cov_trace_pc+0x14/0x7c kernel/kcov.c:207 check_preemption_disabled+0x28/0x104 lib/smp_processor_id.c:14 debug_smp_processor_id+0x20/0x2c lib/smp_processor_id.c:60 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] rcu_is_watching+0x5c/0x18c kernel/rcu/tree.c:721 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x108/0xa50 kernel/locking/lockdep.c:5673 rcu_lock_release+0x30/0x40 include/linux/rcupdate.h:325 rcu_read_unlock include/linux/rcupdate.h:793 [inline] page_ext_put+0xb8/0xd0 mm/page_ext.c:182 page_table_check_clear+0x3d0/0x46c mm/page_table_check.c:88 __page_table_check_pte_clear+0x7c/0x9c mm/page_table_check.c:159 page_table_check_pte_clear include/linux/page_table_check.h:55 [inline] ptep_get_and_clear arch/arm64/include/asm/pgtable.h:944 [inline] ptep_get_and_clear_full include/linux/pgtable.h:429 [inline] zap_pte_range mm/memory.c:1435 [inline] zap_pmd_range mm/memory.c:1574 [inline] zap_pud_range mm/memory.c:1603 [inline] zap_p4d_range mm/memory.c:1624 [inline] unmap_page_range+0x1b7c/0x2080 mm/memory.c:1645 unmap_single_vma mm/memory.c:1691 [inline] unmap_vmas+0x394/0x550 mm/memory.c:1730 exit_mmap+0x1d0/0xa60 mm/mmap.c:3227 __mmput+0xec/0x39c kernel/fork.c:1199 mmput+0x70/0xac kernel/fork.c:1221 exit_mm+0x14c/0x244 kernel/exit.c:563 do_exit+0x4d4/0x1a88 kernel/exit.c:856 do_group_exit+0x194/0x22c kernel/exit.c:1019 get_signal+0x14a0/0x158c kernel/signal.c:2862 do_signal arch/arm64/kernel/signal.c:1076 [inline] do_notify_resume+0x3ac/0x3474 arch/arm64/kernel/signal.c:1129 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 4249: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x458 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x230/0x37c mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:682 [inline] net_alloc net/core/net_namespace.c:410 [inline] copy_net_ns+0x124/0x590 net/core/net_namespace.c:465 create_new_namespaces+0x344/0x614 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:226 ksys_unshare+0x45c/0x874 kernel/fork.c:3203 __do_sys_unshare kernel/fork.c:3274 [inline] __se_sys_unshare kernel/fork.c:3272 [inline] __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3272 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4759: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x2f0/0x588 mm/slub.c:3683 net_free net/core/net_namespace.c:439 [inline] cleanup_net+0x888/0x994 net/core/net_namespace.c:622 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 insert_work+0x64/0x384 kernel/workqueue.c:1361 __queue_work+0xd48/0x136c kernel/workqueue.c:1520 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:1646 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers+0x584/0x718 kernel/time/timer.c:1790 run_timer_softirq+0xcc/0x114 kernel/time/timer.c:1805 __do_softirq+0x314/0xe38 kernel/softirq.c:571 The buggy address belongs to the object at ffff0000dbd8d4c0 which belongs to the cache net_namespace of size 6976 The buggy address is located 1280 bytes inside of 6976-byte region [ffff0000dbd8d4c0, ffff0000dbd8f000) The buggy address belongs to the physical page: page:00000000cf286cf7 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000dbd88000 pfn:0x11bd88 head:00000000cf286cf7 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc00044b3e00 dead000000000002 ffff0000c03de180 raw: ffff0000dbd88000 0000000080040003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dbd8d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dbd8d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000dbd8d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dbd8da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dbd8da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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