================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6+0x10e1/0x1950 net/xfrm/xfrm_policy.c:3460 Read of size 1 at addr ffff888041f3cc04 by task syz-executor.5/22201 CPU: 1 PID: 22201 Comm: syz-executor.5 Not tainted 6.5.0-rc3-syzkaller-00147-g56c6be35fcbe #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 decode_session6+0x10e1/0x1950 net/xfrm/xfrm_policy.c:3460 __xfrm_decode_session+0x54/0xb0 net/xfrm/xfrm_policy.c:3566 xfrm_decode_session_reverse include/net/xfrm.h:1223 [inline] icmpv6_route_lookup+0x397/0x550 net/ipv6/icmp.c:388 icmp6_send+0x11c1/0x2720 net/ipv6/icmp.c:595 __icmpv6_send include/linux/icmpv6.h:28 [inline] icmpv6_send include/linux/icmpv6.h:49 [inline] ip6_link_failure+0x31/0x5a0 net/ipv6/route.c:2785 dst_link_failure include/net/dst.h:437 [inline] ip6_tnl_xmit+0x4f9/0x3960 net/ipv6/ip6_tunnel.c:1268 ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1384 [inline] ip6_tnl_start_xmit+0x6ef/0x1750 net/ipv6/ip6_tunnel.c:1432 __netdev_start_xmit include/linux/netdevice.h:4910 [inline] netdev_start_xmit include/linux/netdevice.h:4924 [inline] xmit_one net/core/dev.c:3537 [inline] dev_hard_start_xmit+0x13d/0x6c0 net/core/dev.c:3553 sch_direct_xmit+0x1ac/0xc20 net/sched/sch_generic.c:342 qdisc_restart net/sched/sch_generic.c:407 [inline] __qdisc_run+0x540/0x19d0 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3827 [inline] __dev_queue_xmit+0x26ab/0x3f20 net/core/dev.c:4169 dev_queue_xmit include/linux/netdevice.h:3088 [inline] neigh_connected_output+0x42c/0x5d0 net/core/neighbour.c:1581 neigh_output include/net/neighbour.h:544 [inline] ip6_finish_output2+0x5d0/0x1b20 net/ipv6/ip6_output.c:135 ip6_fragment+0xbf4/0x2a40 net/ipv6/ip6_output.c:1008 __ip6_finish_output net/ipv6/ip6_output.c:194 [inline] ip6_finish_output+0x7a8/0x11d0 net/ipv6/ip6_output.c:207 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip6_output+0x243/0x890 net/ipv6/ip6_output.c:228 dst_output include/net/dst.h:458 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] NF_HOOK include/linux/netfilter.h:297 [inline] ip6_xmit+0xe1d/0x1fe0 net/ipv6/ip6_output.c:344 sctp_v6_xmit+0xc16/0x1110 net/sctp/ipv6.c:250 sctp_packet_transmit+0x22e1/0x3010 net/sctp/output.c:653 sctp_packet_singleton+0x19f/0x370 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x54c/0x3340 net/sctp/outqueue.c:1212 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1818 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline] sctp_do_sm+0x1786/0x5c40 net/sctp/sm_sideeffect.c:1169 sctp_primitive_ASSOCIATE+0x9c/0xc0 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0xa2b/0x1a90 net/sctp/socket.c:1840 sctp_sendmsg+0xee4/0x1e80 net/sctp/socket.c:2030 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:748 __sys_sendto+0x255/0x340 net/socket.c:2134 __do_sys_sendto net/socket.c:2146 [inline] __se_sys_sendto net/socket.c:2142 [inline] __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2142 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc48f47cb29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc4902c30c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fc48f59bf80 RCX: 00007fc48f47cb29 RDX: 0000000000000001 RSI: 0000000020000540 RDI: 0000000000000003 RBP: 00007fc48f4c847a R08: 00000000200005c0 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fc48f59bf80 R15: 00007ffeedad6f18 Allocated by task 21621: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:985 [inline] __kmalloc+0x5d/0x100 mm/slab_common.c:998 kmalloc include/linux/slab.h:586 [inline] sk_prot_alloc+0x1a4/0x2a0 net/core/sock.c:2077 sk_alloc+0x3a/0x7f0 net/core/sock.c:2130 __netlink_create+0x63/0x380 net/netlink/af_netlink.c:649 netlink_create+0x3ac/0x600 net/netlink/af_netlink.c:712 __sock_create+0x334/0x810 net/socket.c:1536 sock_create net/socket.c:1587 [inline] __sys_socket_create net/socket.c:1624 [inline] __sys_socket+0x13d/0x250 net/socket.c:1652 __do_sys_socket net/socket.c:1665 [inline] __se_sys_socket net/socket.c:1663 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1663 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2649 netlink_release+0xea3/0x1f80 net/netlink/af_netlink.c:828 __sock_release+0xcd/0x290 net/socket.c:654 sock_close+0x1c/0x20 net/socket.c:1386 __fput+0x3fd/0xac0 fs/file_table.c:384 task_work_run+0x14d/0x240 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2649 netlink_release+0xea3/0x1f80 net/netlink/af_netlink.c:828 __sock_release+0xcd/0x290 net/socket.c:654 sock_close+0x1c/0x20 net/socket.c:1386 __fput+0x3fd/0xac0 fs/file_table.c:384 task_work_run+0x14d/0x240 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa99/0x2a20 kernel/exit.c:874 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x23ea/0x2770 kernel/signal.c:2881 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888041f3c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1028 bytes to the right of allocated 2048-byte region [ffff888041f3c000, ffff888041f3c800) The buggy address belongs to the physical page: page:ffffea000107ce00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x41f38 head:ffffea000107ce00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012842000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6585, tgid 6569 (syz-executor.2), ts 169179796188, free_ts 169150246946 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3509 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1076 kmalloc include/linux/slab.h:582 [inline] kzalloc include/linux/slab.h:703 [inline] copy_verifier_state+0x87a/0xbf0 kernel/bpf/verifier.c:1766 is_state_visited kernel/bpf/verifier.c:16072 [inline] do_check kernel/bpf/verifier.c:16228 [inline] do_check_common+0x2d8a/0xd2a0 kernel/bpf/verifier.c:18817 do_check_main kernel/bpf/verifier.c:18880 [inline] bpf_check+0x740c/0xaab0 kernel/bpf/verifier.c:19504 bpf_prog_load+0x153a/0x2270 kernel/bpf/syscall.c:2707 __sys_bpf+0xb8a/0x4e20 kernel/bpf/syscall.c:5137 __do_sys_bpf kernel/bpf/syscall.c:5241 [inline] __se_sys_bpf kernel/bpf/syscall.c:5239 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5239 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2443 __unfreeze_partials+0x21d/0x240 mm/slub.c:2647 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18b/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] __kmem_cache_alloc_node+0x19b/0x350 mm/slub.c:3509 kmalloc_node_trace+0x22/0xd0 mm/slab_common.c:1089 kmalloc_node include/linux/slab.h:598 [inline] kzalloc_node include/linux/slab.h:714 [inline] __get_vm_area_node+0xe1/0x3d0 mm/vmalloc.c:2588 __vmalloc_node_range+0x27a/0x1540 mm/vmalloc.c:3276 __vmalloc_node mm/vmalloc.c:3381 [inline] vzalloc+0x6b/0x80 mm/vmalloc.c:3454 alloc_counters net/ipv4/netfilter/ip_tables.c:799 [inline] copy_entries_to_user net/ipv4/netfilter/ip_tables.c:821 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1022 [inline] do_ipt_get_ctl+0x68b/0xa60 net/ipv4/netfilter/ip_tables.c:1660 nf_getsockopt+0x76/0xe0 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x186/0x1d0 net/ipv4/ip_sockglue.c:1825 tcp_getsockopt+0x97/0xf0 net/ipv4/tcp.c:4304 __sys_getsockopt+0x220/0x6a0 net/socket.c:2307 Memory state around the buggy address: ffff888041f3cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888041f3cb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888041f3cc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888041f3cc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888041f3cd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================