================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6 net/xfrm/xfrm_policy.c:3377 [inline] BUG: KASAN: slab-out-of-bounds in __xfrm_decode_session+0x1520/0x1d20 net/xfrm/xfrm_policy.c:3484 Read of size 1 at addr ffff0000f5042668 by task udevd/3586 CPU: 0 PID: 3586 Comm: udevd Not tainted 5.15.117-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 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:3377 [inline] __xfrm_decode_session+0x1520/0x1d20 net/xfrm/xfrm_policy.c:3484 vti6_tnl_xmit+0x378/0x17e4 __netdev_start_xmit include/linux/netdevice.h:5022 [inline] netdev_start_xmit include/linux/netdevice.h:5036 [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:1553 neigh_output include/net/neighbour.h:516 [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:296 [inline] ip6_output+0x270/0x594 net/ipv6/ip6_output.c:224 dst_output include/net/dst.h:449 [inline] NF_HOOK include/linux/netfilter.h:307 [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:3932 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:757 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267 el0_interrupt+0x98/0x2d4 arch/arm64/kernel/entry-common.c:671 __el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:678 el0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:683 el0t_64_irq+0x1a0/0x1a4 arch/arm64/kernel/entry.S:585 Allocated by task 4000: 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] kmalloc_array include/linux/slab.h:630 [inline] rtnl_newlink+0x110/0x1ab8 net/core/rtnetlink.c:3512 rtnetlink_rcv_msg+0xa74/0xdac net/core/rtnetlink.c:5593 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2504 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5611 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1923 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] __sys_sendto+0x388/0x4d0 net/socket.c:2039 __do_sys_sendto net/socket.c:2051 [inline] __se_sys_sendto net/socket.c:2047 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2047 __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:596 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000f5042400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 104 bytes to the right of 512-byte region [ffff0000f5042400, ffff0000f5042600) The buggy address belongs to the page: page:0000000075a6afc2 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f5042c00 pfn:0x135040 head:0000000075a6afc2 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003d40f00 0000000400000004 ffff0000c0002600 raw: ffff0000f5042c00 000000008010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f5042500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f5042580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f5042600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000f5042680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f5042700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================