================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6+0x10e1/0x1950 net/xfrm/xfrm_policy.c:3460 Read of size 1 at addr ffff888035cd7e4a by task syz-executor.0/13888 CPU: 1 PID: 13888 Comm: syz-executor.0 Not tainted 6.5.0-rc5-syzkaller-00387-g4c75bf7e4a0e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 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_finish_output net/ipv6/ip6_output.c:196 [inline] ip6_finish_output+0x485/0x11d0 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] ip6_local_out+0xaf/0x190 net/ipv6/output_core.c:155 ip6_send_skb+0xb7/0x330 net/ipv6/ip6_output.c:2008 udp_v6_send_skb+0x9b2/0x1900 net/ipv6/udp.c:1302 udp_v6_push_pending_frames+0x13c/0x210 net/ipv6/udp.c:1329 udpv6_sendmsg+0x1b2a/0x2f80 net/ipv6/udp.c:1624 inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:651 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:748 ____sys_sendmsg+0x2ac/0x940 net/socket.c:2494 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2548 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2634 __do_sys_sendmmsg net/socket.c:2663 [inline] __se_sys_sendmmsg net/socket.c:2660 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2660 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: 0033:0x7f353647cae9 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:00007f3534ffe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f353659bf80 RCX: 00007f353647cae9 RDX: 0000000000000001 RSI: 0000000020006340 RDI: 0000000000000003 RBP: 00007f35364c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f353659bf80 R15: 00007fffb39c7f28 Allocated by task 0: 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_node_track_caller+0x5e/0x100 mm/slab_common.c:1005 kmalloc_reserve+0xef/0x270 net/core/skbuff.c:575 __alloc_skb+0x12b/0x330 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1289 [inline] mrp_pdu_init net/802/mrp.c:313 [inline] mrp_pdu_append_vecattr_event+0x943/0x1260 net/802/mrp.c:412 mrp_attr_event+0x17b/0x290 net/802/mrp.c:507 mrp_mad_event net/802/mrp.c:587 [inline] mrp_join_timer+0x61/0x120 net/802/mrp.c:604 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 Freed by task 0: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook+0x10b/0x1e0 mm/slub.c:1818 slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3814 skb_kfree_head net/core/skbuff.c:894 [inline] skb_free_head+0x110/0x1b0 net/core/skbuff.c:906 skb_release_data+0x5ba/0x870 net/core/skbuff.c:936 skb_release_all net/core/skbuff.c:1002 [inline] kfree_skb_add_bulk net/core/skbuff.c:1073 [inline] kfree_skb_list_reason+0x1af/0x4b0 net/core/skbuff.c:1095 __dev_xmit_skb net/core/dev.c:3833 [inline] __dev_queue_xmit+0x273a/0x3f20 net/core/dev.c:4169 dev_queue_xmit include/linux/netdevice.h:3088 [inline] mrp_queue_xmit net/802/mrp.c:364 [inline] mrp_join_timer+0x94/0x120 net/802/mrp.c:608 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 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+0x3f7/0xac0 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 rxrpc_put_txbuf net/rxrpc/txbuf.c:98 [inline] rxrpc_put_txbuf+0x169/0x1a0 net/rxrpc/txbuf.c:84 rxrpc_destroy_call+0x173/0x5b0 net/rxrpc/call_object.c:692 rxrpc_cleanup_call+0x12f/0x1a0 net/rxrpc/call_object.c:727 rxrpc_put_call+0x2b4/0x390 net/rxrpc/call_object.c:661 rxrpc_io_thread+0x74d/0x1710 net/rxrpc/io_thread.c:462 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff888035cd7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1610 bytes to the right of allocated 2048-byte region [ffff888035cd7000, ffff888035cd7800) The buggy address belongs to the physical page: page:ffffea0000d73400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35cd0 head:ffffea0000d73400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012842000 ffffea000132f800 dead000000000002 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 21904, tgid 21903 (syz-executor.1), ts 1076853656676, free_ts 1076821154268 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:2292 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 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc+0x4c/0x100 mm/slab_common.c:998 kmalloc include/linux/slab.h:586 [inline] sk_prot_alloc+0x1a4/0x2a0 net/core/sock.c:2088 sk_alloc+0x3a/0x7f0 net/core/sock.c:2141 __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 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 __folio_put_large mm/swap.c:119 [inline] __folio_put+0x10a/0x140 mm/swap.c:127 folio_put include/linux/mm.h:1440 [inline] put_page+0x21e/0x280 include/linux/mm.h:1509 page_to_skb+0x79a/0xac0 drivers/net/virtio_net.c:560 receive_mergeable drivers/net/virtio_net.c:1469 [inline] receive_buf+0x11c5/0x52f0 drivers/net/virtio_net.c:1590 virtnet_receive drivers/net/virtio_net.c:1888 [inline] virtnet_poll+0x772/0x1530 drivers/net/virtio_net.c:1960 __napi_poll.constprop.0+0xb4/0x530 net/core/dev.c:6460 napi_poll net/core/dev.c:6527 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6660 __do_softirq+0x218/0x965 kernel/softirq.c:553 Memory state around the buggy address: ffff888035cd7d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888035cd7d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888035cd7e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888035cd7e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888035cd7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================