================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6+0x10e1/0x1950 net/xfrm/xfrm_policy.c:3460 Read of size 1 at addr ffff8880820a8fb4 by task syz-executor.1/12368 CPU: 0 PID: 12368 Comm: syz-executor.1 Not tainted 6.6.0-rc2-syzkaller-00277-g51e7a66666e0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 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+0x11b2/0x2710 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:2787 dst_link_failure include/net/dst.h:437 [inline] ip6_tnl_xmit+0x4f9/0x3920 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:4889 [inline] netdev_start_xmit include/linux/netdevice.h:4903 [inline] xmit_one net/core/dev.c:3544 [inline] dev_hard_start_xmit+0x13d/0x6c0 net/core/dev.c:3560 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:3834 [inline] __dev_queue_xmit+0x24db/0x3d60 net/core/dev.c:4306 dev_queue_xmit include/linux/netdevice.h:3082 [inline] neigh_connected_output+0x42c/0x5d0 net/core/neighbour.c:1583 neigh_output include/net/neighbour.h:542 [inline] ip6_finish_output2+0x584/0x1700 net/ipv6/ip6_output.c:135 __ip6_finish_output net/ipv6/ip6_output.c:196 [inline] ip6_finish_output+0x485/0x1250 net/ipv6/ip6_output.c:207 NF_HOOK_COND include/linux/netfilter.h:293 [inline] ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:228 dst_output include/net/dst.h:458 [inline] NF_HOOK include/linux/netfilter.h:304 [inline] NF_HOOK include/linux/netfilter.h:298 [inline] ip6_xmit+0x1253/0x1cf0 net/ipv6/ip6_output.c:344 inet6_csk_xmit+0x3be/0x730 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x1a30/0x3b30 net/ipv4/tcp_output.c:1416 tcp_transmit_skb net/ipv4/tcp_output.c:1434 [inline] tcp_send_syn_data net/ipv4/tcp_output.c:3898 [inline] tcp_connect+0x210a/0x5430 net/ipv4/tcp_output.c:3963 tcp_v6_connect+0x147f/0x2000 net/ipv6/tcp_ipv6.c:338 __inet_stream_connect+0x38b/0xe20 net/ipv4/af_inet.c:676 tcp_sendmsg_fastopen+0x3d2/0x700 net/ipv4/tcp.c:1021 tcp_sendmsg_locked+0x1ef0/0x3440 net/ipv4/tcp.c:1073 tcp_sendmsg+0x2e/0x40 net/ipv4/tcp.c:1336 inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:655 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 __sys_sendto+0x255/0x340 net/socket.c:2194 __do_sys_sendto net/socket.c:2206 [inline] __se_sys_sendto net/socket.c:2202 [inline] __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2202 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: 0033:0x7f855c47cae9 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:00007f855d16a0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f855c59bf80 RCX: 00007f855c47cae9 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f855c4c847a R08: 0000000020b63fe4 R09: 000000000000001b R10: 0000000020008845 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f855c59bf80 R15: 00007fff03ffa028 Allocated by task 8646: 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:198 [inline] __do_kmalloc_node mm/slab_common.c:1023 [inline] __kmalloc_node_track_caller+0x61/0x100 mm/slab_common.c:1043 kmemdup+0x29/0x60 mm/util.c:131 kmemdup include/linux/fortify-string.h:765 [inline] neigh_sysctl_register+0xb3/0x650 net/core/neighbour.c:3786 devinet_sysctl_register+0xaa/0x220 net/ipv4/devinet.c:2644 inetdev_init+0x286/0x570 net/ipv4/devinet.c:286 inetdev_event+0x1156/0x1900 net/ipv4/devinet.c:1555 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1970 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] register_netdevice+0xf84/0x1490 net/core/dev.c:10169 br_dev_newlink+0x27/0x110 net/bridge/br_netlink.c:1552 rtnl_newlink_create net/core/rtnetlink.c:3485 [inline] __rtnl_newlink+0x1177/0x1940 net/core/rtnetlink.c:3705 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3718 rtnetlink_rcv_msg+0x3c4/0xdf0 net/core/rtnetlink.c:6444 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0x536/0x810 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2558 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2612 __sys_sendmsg+0x117/0x1e0 net/socket.c:2641 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 The buggy address belongs to the object at ffff8880820a8000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 2604 bytes to the right of allocated 1416-byte region [ffff8880820a8000, ffff8880820a8588) The buggy address belongs to the physical page: page:ffffea0002082a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x820a8 head:ffffea0002082a00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88803d7d2081 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888012c4f3c0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000001ffffffff ffff88803d7d2081 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 8646, tgid 8645 (syz-executor.5), ts 2106197304933, free_ts 2106167660245 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0xee0/0x2f20 mm/page_alloc.c:3170 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x251/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8c7/0x1580 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x131/0x340 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc_node_track_caller+0x50/0x100 mm/slab_common.c:1043 kmemdup+0x29/0x60 mm/util.c:131 kmemdup include/linux/fortify-string.h:765 [inline] neigh_sysctl_register+0xb3/0x650 net/core/neighbour.c:3786 devinet_sysctl_register+0xaa/0x220 net/ipv4/devinet.c:2644 inetdev_init+0x286/0x570 net/ipv4/devinet.c:286 inetdev_event+0x1156/0x1900 net/ipv4/devinet.c:1555 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1970 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2312 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2405 __folio_put+0xeb/0x110 mm/swap.c:127 folio_put include/linux/mm.h:1475 [inline] put_page+0x21e/0x280 include/linux/mm.h:1544 page_to_skb+0x79a/0xac0 drivers/net/virtio_net.c:592 receive_mergeable drivers/net/virtio_net.c:1651 [inline] receive_buf+0x11bc/0x52b0 drivers/net/virtio_net.c:1772 virtnet_receive drivers/net/virtio_net.c:2076 [inline] virtnet_poll+0x9cb/0x1630 drivers/net/virtio_net.c:2148 __napi_poll.constprop.0+0xb4/0x530 net/core/dev.c:6527 napi_poll net/core/dev.c:6594 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6727 __do_softirq+0x218/0x965 kernel/softirq.c:553 Memory state around the buggy address: ffff8880820a8e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880820a8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880820a8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880820a9000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880820a9080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================