================================================================== BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:982 [inline] BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:560 [inline] BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x518/0xb58 net/xfrm/xfrm_state.c:830 Write of size 8 at addr ffff0000f2ae0030 by task syz.4.430/8489 CPU: 0 UID: 0 PID: 8489 Comm: syz.4.430 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_store8_noabort+0x20/0x2c mm/kasan/report_generic.c:386 __hlist_del include/linux/list.h:982 [inline] hlist_del_rcu include/linux/rculist.h:560 [inline] __xfrm_state_delete+0x518/0xb58 net/xfrm/xfrm_state.c:830 xfrm_timer_handler+0x16c/0x80c net/xfrm/xfrm_state.c:716 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x41c/0xb78 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x160/0x400 kernel/time/hrtimer.c:1842 handle_softirqs+0x328/0xc88 kernel/softirq.c:579 __do_softirq+0x14/0x20 kernel/softirq.c:613 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:68 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73 invoke_softirq kernel/softirq.c:460 [inline] __irq_exit_rcu+0x1b0/0x478 kernel/softirq.c:680 irq_exit_rcu+0x14/0x84 kernel/softirq.c:696 __el1_irq arch/arm64/kernel/entry-common.c:654 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:668 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:673 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:592 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_release+0x270/0x39c kernel/locking/lockdep.c:5892 (P) __mutex_unlock_slowpath+0xcc/0x6dc kernel/locking/mutex.c:922 mutex_unlock+0x18/0x24 kernel/locking/mutex.c:536 __unix_dgram_recvmsg+0x7f4/0xb7c net/unix/af_unix.c:2684 unix_dgram_recvmsg+0xd0/0xe8 net/unix/af_unix.c:2700 sock_recvmsg_nosec+0x90/0xec net/socket.c:1065 ____sys_recvmsg+0x5e0/0x744 net/socket.c:2832 ___sys_recvmsg+0x188/0x45c net/socket.c:2876 do_recvmmsg+0x294/0x7cc net/socket.c:2971 __sys_recvmmsg net/socket.c:3045 [inline] __do_sys_recvmmsg net/socket.c:3068 [inline] __se_sys_recvmmsg net/socket.c:3061 [inline] __arm64_sys_recvmmsg+0x17c/0x238 net/socket.c:3061 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 7330: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x238/0x3e8 mm/slub.c:4236 xfrm_state_alloc+0x2c/0x264 net/xfrm/xfrm_state.c:733 __find_acq_core+0x720/0x1540 net/xfrm/xfrm_state.c:1833 xfrm_find_acq+0x94/0xcc net/xfrm/xfrm_state.c:2353 xfrm_alloc_userspi+0x52c/0x9c8 net/xfrm/xfrm_user.c:1863 xfrm_user_rcv_msg+0x588/0x7c4 net/xfrm/xfrm_user.c:3501 netlink_rcv_skb+0x220/0x3fc net/netlink/af_netlink.c:2552 xfrm_netlink_rcv+0x80/0x9c net/xfrm/xfrm_user.c:3523 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x694/0x8c4 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x648/0x930 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0x490/0x7b8 net/socket.c:2614 ___sys_sendmsg+0x204/0x278 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2703 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 6617: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x74/0x98 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x184/0x550 mm/slub.c:4782 xfrm_state_free net/xfrm/xfrm_state.c:591 [inline] xfrm_state_gc_destroy net/xfrm/xfrm_state.c:618 [inline] xfrm_state_gc_task+0x468/0x560 net/xfrm/xfrm_state.c:634 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 The buggy address belongs to the object at ffff0000f2ae0000 which belongs to the cache xfrm_state of size 928 The buggy address is located 48 bytes inside of freed 928-byte region [ffff0000f2ae0000, ffff0000f2ae03a0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000f2ae0440 pfn:0x132ae0 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c30ceb40 dead000000000122 0000000000000000 raw: ffff0000f2ae0440 00000000800f000e 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c30ceb40 dead000000000122 0000000000000000 head: ffff0000f2ae0440 00000000800f000e 00000000f5000000 0000000000000000 head: 05ffc00000000002 fffffdffc3cab801 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f2adff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f2adff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f2ae0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f2ae0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f2ae0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================