================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6 net/xfrm/xfrm_policy.c:3384 [inline] BUG: KASAN: slab-out-of-bounds in __xfrm_decode_session+0x1520/0x1d20 net/xfrm/xfrm_policy.c:3491 Read of size 1 at addr ffff000115d96a65 by task syz-executor.0/4734 CPU: 1 PID: 4734 Comm: syz-executor.0 Not tainted 5.15.125-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 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 decode_session6 net/xfrm/xfrm_policy.c:3384 [inline] __xfrm_decode_session+0x1520/0x1d20 net/xfrm/xfrm_policy.c:3491 xfrm_decode_session include/net/xfrm.h:1156 [inline] xfrmi_xmit+0x1a0/0x12f8 net/xfrm/xfrm_interface_core.c:402 __netdev_start_xmit include/linux/netdevice.h:5018 [inline] netdev_start_xmit include/linux/netdevice.h:5032 [inline] xmit_one net/core/dev.c:3594 [inline] dev_hard_start_xmit+0x2bc/0x92c net/core/dev.c:3610 sch_direct_xmit+0x2e0/0x484 net/sched/sch_generic.c:342 qdisc_restart net/sched/sch_generic.c:407 [inline] __qdisc_run+0x878/0x1fc0 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3879 [inline] __dev_queue_xmit+0x1068/0x2a6c net/core/dev.c:4190 dev_queue_xmit+0x24/0x34 net/core/dev.c:4258 neigh_connected_output+0x334/0x378 net/core/neighbour.c:1522 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x1344/0x1c48 net/ipv6/ip6_output.c:126 __ip6_finish_output+0x518/0x67c net/ipv6/ip6_output.c:191 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:201 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x270/0x594 net/ipv6/ip6_output.c:224 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xbf8/0x1788 net/ipv6/ndisc.c:508 ndisc_send_rs+0x494/0x5fc net/ipv6/ndisc.c:702 addrconf_rs_timer+0x308/0x5a8 net/ipv6/addrconf.c:3937 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+0x344/0xe20 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+0x28c/0x534 kernel/softirq.c:636 irq_exit+0x14/0x88 kernel/softirq.c:660 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:442 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:458 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0xbc/0x158 kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:1016 [inline] debug_check_no_obj_freed+0x4f0/0x50c lib/debugobjects.c:1037 free_pages_prepare mm/page_alloc.c:1345 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x32c/0xe30 mm/page_alloc.c:3317 free_unref_page_list+0xe4/0x7a8 mm/page_alloc.c:3433 release_pages+0x1770/0x1a88 mm/swap.c:963 __pagevec_release+0x94/0x10c mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x578/0x1460 mm/shmem.c:964 shmem_truncate_range mm/shmem.c:1063 [inline] shmem_evict_inode+0x1c4/0x844 mm/shmem.c:1145 evict+0x260/0x68c fs/inode.c:587 iput_final fs/inode.c:1705 [inline] iput+0x744/0x824 fs/inode.c:1731 dentry_unlink_inode+0x370/0x4b0 fs/dcache.c:376 __dentry_kill+0x324/0x5e4 fs/dcache.c:582 dentry_kill+0xc8/0x250 dput+0x21c/0x458 fs/dcache.c:888 __fput+0x500/0x7f0 fs/file_table.c:288 ____fput+0x20/0x30 fs/file_table.c:308 task_work_run+0x130/0x1e4 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x688/0x2134 kernel/exit.c:872 do_group_exit+0x110/0x268 kernel/exit.c:994 get_signal+0x634/0x1550 kernel/signal.c:2889 do_signal arch/arm64/kernel/signal.c:890 [inline] do_notify_resume+0x3d0/0x32b8 arch/arm64/kernel/signal.c:943 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:597 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 4066: 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_kmalloc+0xbc/0xfc mm/kasan/common.c:513 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x27c/0x47c mm/slub.c:3247 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x3f4/0xa8c net/ipv6/mcast.c:936 ipv6_dev_mc_inc+0x2c/0x3c net/ipv6/mcast.c:957 addrconf_join_solict net/ipv6/addrconf.c:2183 [inline] addrconf_dad_begin net/ipv6/addrconf.c:3997 [inline] addrconf_dad_work+0x320/0x126c net/ipv6/addrconf.c:4124 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 ffff000115d96800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 101 bytes to the right of 512-byte region [ffff000115d96800, ffff000115d96a00) The buggy address belongs to the page: page:0000000076aedb08 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff000115d97400 pfn:0x155d94 head:0000000076aedb08 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0004576308 fffffc0003294e08 ffff0000c0002600 raw: ffff000115d97400 000000000010000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000115d96900: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff000115d96980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff000115d96a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff000115d96a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff000115d96b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================