================================================================== BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:388 [inline] BUG: KASAN: use-after-free in tcp_write_timer_handler+0x6ec/0x808 net/ipv4/tcp_timer.c:652 Read of size 1 at addr ffff00019607a385 by task syz-executor.4/22190 CPU: 0 PID: 22190 Comm: syz-executor.4 Not tainted 6.1.82-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 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_load1_noabort+0x2c/0x38 mm/kasan/report_generic.c:348 tcp_probe_timer net/ipv4/tcp_timer.c:388 [inline] tcp_write_timer_handler+0x6ec/0x808 net/ipv4/tcp_timer.c:652 tcp_write_timer+0x170/0x2e4 net/ipv4/tcp_timer.c:665 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 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] kasan_quarantine_put+0xec/0x204 mm/kasan/quarantine.c:242 ____kasan_slab_free+0x150/0x1c0 mm/kasan/common.c:238 __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 ptlock_free mm/memory.c:6036 [inline] pgtable_pte_page_dtor+0x54/0x1c8 include/linux/mm.h:2425 __pte_free_tlb arch/arm64/include/asm/tlb.h:78 [inline] free_pte_range mm/memory.c:226 [inline] free_pmd_range mm/memory.c:244 [inline] free_pud_range mm/memory.c:278 [inline] free_p4d_range mm/memory.c:312 [inline] free_pgd_range+0x5d8/0xcdc mm/memory.c:392 free_pgtables+0x368/0x3d0 exit_mmap+0x300/0xa60 mm/mmap.c:3237 __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 9824: 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 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 Second to 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 ffff000196079c40 which belongs to the cache net_namespace of size 6976 The buggy address is located 1861 bytes inside of 6976-byte region [ffff000196079c40, ffff00019607b780) The buggy address belongs to the physical page: page:0000000063a7f709 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d6078 head:0000000063a7f709 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000d4953b01 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003582c00 dead000000000003 ffff0000c03de180 raw: 0000000000000000 0000000080040004 00000001ffffffff ffff0000d4953b01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00019607a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00019607a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00019607a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00019607a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00019607a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================