================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6+0xe7c/0x1580 net/xfrm/xfrm_policy.c:3389 Read of size 1 at addr ffff88809edddd50 by task syz-executor.5/2845 CPU: 1 PID: 2845 Comm: syz-executor.5 Not tainted 5.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 decode_session6+0xe7c/0x1580 net/xfrm/xfrm_policy.c:3389 __xfrm_decode_session+0x50/0xb0 net/xfrm/xfrm_policy.c:3481 xfrm_decode_session_reverse include/net/xfrm.h:1141 [inline] icmpv6_route_lookup+0x304/0x470 net/ipv6/icmp.c:388 icmp6_send+0x1327/0x26b0 net/ipv6/icmp.c:588 icmpv6_send+0xde/0x210 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x26/0x500 net/ipv6/route.c:2665 dst_link_failure include/net/dst.h:418 [inline] ipip6_tunnel_xmit net/ipv6/sit.c:1042 [inline] sit_tunnel_xmit+0x1919/0x29d0 net/ipv6/sit.c:1079 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one net/core/dev.c:3556 [inline] dev_hard_start_xmit+0x193/0x950 net/core/dev.c:3572 sch_direct_xmit+0x2ea/0xc00 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4b9/0x1630 net/sched/sch_generic.c:384 __dev_xmit_skb net/core/dev.c:3795 [inline] __dev_queue_xmit+0x1995/0x2d60 net/core/dev.c:4100 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x8b6/0x17b0 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:435 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0x1258/0x1e80 net/ipv6/ip6_output.c:280 sctp_v6_xmit+0x339/0x650 net/sctp/ipv6.c:217 sctp_packet_transmit+0x20d7/0x3240 net/sctp/output.c:629 sctp_packet_singleton net/sctp/outqueue.c:773 [inline] sctp_outq_flush_ctrl.constprop.0+0x6d3/0xc40 net/sctp/outqueue.c:904 sctp_outq_flush+0xfb/0x2380 net/sctp/outqueue.c:1186 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1801 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline] sctp_do_sm+0x4d0/0x4d80 net/sctp/sm_sideeffect.c:1156 sctp_primitive_ASSOCIATE+0x98/0xc0 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0xb44/0x2090 net/sctp/socket.c:1848 sctp_sendmsg+0x1025/0x1cf0 net/sctp/socket.c:2038 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:814 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x331/0x810 net/socket.c:2352 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406 __sys_sendmmsg+0x195/0x480 net/socket.c:2496 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg net/socket.c:2522 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2522 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca59 Code: Bad RIP value. RSP: 002b:00007f677b566c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000004fd400 RCX: 000000000045ca59 RDX: 0000000000000001 RSI: 00000000200006c0 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000902 R14: 00000000004cbd15 R15: 00007f677b5676d4 Allocated by task 7426: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:753 [inline] xt_alloc_table_info+0x3c/0xa0 net/netfilter/x_tables.c:1176 do_replace net/ipv6/netfilter/ip6_tables.c:1142 [inline] do_ip6t_set_ctl+0x226/0x460 net/ipv6/netfilter/ip6_tables.c:1681 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x6f/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x10c/0x170 net/ipv6/ipv6_sockglue.c:905 tcp_setsockopt+0x86/0xd0 net/ipv4/tcp.c:3334 __sys_setsockopt+0x24a/0x480 net/socket.c:2127 __do_sys_setsockopt net/socket.c:2143 [inline] __se_sys_setsockopt net/socket.c:2140 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2140 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 7135: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x103/0x2c0 mm/slab.c:3757 sk_prot_free net/core/sock.c:1730 [inline] __sk_destruct+0x63b/0x860 net/core/sock.c:1814 sk_destruct+0xbd/0xe0 net/core/sock.c:1829 __sk_free+0xef/0x3d0 net/core/sock.c:1840 sk_free+0x78/0xa0 net/core/sock.c:1851 deferred_put_nlk_sk+0x151/0x2e0 net/netlink/af_netlink.c:729 rcu_do_batch kernel/rcu/tree.c:2396 [inline] rcu_core+0x5c7/0x1160 kernel/rcu/tree.c:2623 __do_softirq+0x34c/0xa60 kernel/softirq.c:292 The buggy address belongs to the object at ffff88809eddd000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1360 bytes to the right of 2048-byte region [ffff88809eddd000, ffff88809eddd800) The buggy address belongs to the page: page:ffffea00027b7740 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002566d88 ffffea00026a7188 ffff8880aa000e00 raw: 0000000000000000 ffff88809eddd000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809edddc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809edddc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809edddd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809edddd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809eddde00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================