================================================================== BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:384 [inline] BUG: KASAN: use-after-free in tcp_write_timer_handler+0x78c/0x8a8 net/ipv4/tcp_timer.c:648 Read of size 1 at addr ffff0000dc573b0d by task syz-executor413/3994 CPU: 1 PID: 3994 Comm: syz-executor413 Not tainted 5.15.149-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306 tcp_probe_timer net/ipv4/tcp_timer.c:384 [inline] tcp_write_timer_handler+0x78c/0x8a8 net/ipv4/tcp_timer.c:648 tcp_write_timer+0x178/0x318 net/ipv4/tcp_timer.c:664 call_timer_fn+0x19c/0x8f0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x554/0x718 kernel/time/timer.c:1737 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1750 __do_softirq+0x344/0xdb0 kernel/softirq.c:558 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:439 [inline] __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:637 irq_exit+0x14/0x88 kernel/softirq.c:661 handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:758 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580 check_kcov_mode kernel/kcov.c:163 [inline] __sanitizer_cov_trace_pc+0x5c/0x94 kernel/kcov.c:197 unwind_frame+0x31c/0x550 arch/arm64/kernel/stacktrace.c:113 walk_stackframe arch/arm64/kernel/stacktrace.c:148 [inline] arch_stack_walk+0x270/0x32c arch/arm64/kernel/stacktrace.c:238 stack_trace_save+0xfc/0x1a0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x3f4 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] kmem_cache_alloc_node+0x208/0x49c mm/slub.c:3256 alloc_vmap_area+0x158/0x16a8 mm/vmalloc.c:1531 __get_vm_area_node+0x178/0x2e0 mm/vmalloc.c:2423 __vmalloc_node_range+0xe4/0x8e4 mm/vmalloc.c:3019 __vmalloc_node mm/vmalloc.c:3079 [inline] vzalloc+0x128/0x19c mm/vmalloc.c:3149 alloc_counters+0x84/0x7ec net/ipv4/netfilter/ip_tables.c:800 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:839 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0xc78/0x17fc net/ipv6/netfilter/ip6_tables.c:1671 nf_getsockopt+0x264/0x284 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x58c/0x3470 net/ipv6/ipv6_sockglue.c:1489 tcp_getsockopt+0x294/0x797c net/ipv4/tcp.c:4304 sock_common_getsockopt+0xa8/0xc4 net/core/sock.c:3405 __sys_getsockopt+0x1e8/0x460 net/socket.c:2242 __do_sys_getsockopt net/socket.c:2257 [inline] __se_sys_getsockopt net/socket.c:2254 [inline] __arm64_sys_getsockopt+0xb8/0xd4 net/socket.c:2254 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 3991: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x3f4 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x1dc/0x45c mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:711 [inline] net_alloc net/core/net_namespace.c:405 [inline] copy_net_ns+0x128/0x5e4 net/core/net_namespace.c:460 create_new_namespaces+0x330/0x61c kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:226 ksys_unshare+0x45c/0x874 kernel/fork.c:3101 __do_sys_unshare kernel/fork.c:3175 [inline] __se_sys_unshare kernel/fork.c:3173 [inline] __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3173 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 136: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1ec mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3c4 mm/slub.c:3515 net_free net/core/net_namespace.c:434 [inline] cleanup_net+0x8a0/0x9bc net/core/net_namespace.c:617 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:319 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 The buggy address belongs to the object at ffff0000dc573480 which belongs to the cache net_namespace of size 6464 The buggy address is located 1677 bytes inside of 6464-byte region [ffff0000dc573480, ffff0000dc574dc0) The buggy address belongs to the page: page:00000000082df7fe refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000dc571a40 pfn:0x11c570 head:00000000082df7fe order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0840000 raw: ffff0000dc571a40 0000000080040003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dc573a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dc573a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000dc573b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dc573b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dc573c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================