================================================================== BUG: KASAN: slab-out-of-bounds in __ipv6_addr_type+0x26c/0x290 net/ipv6/addrconf_core.c:68 Read of size 4 at addr ffff8801d2b1cbb8 by task syz-executor.5/2612 CPU: 1 PID: 2612 Comm: syz-executor.5 Not tainted 4.4.174+ #4 0000000000000000 c630afdfc7de6dd0 ffff880085c26da0 ffffffff81aad1a1 0000000000000000 ffffea00074ac700 ffff8801d2b1cbb8 0000000000000004 ffff8801d2b1c900 ffff880085c26dd8 ffffffff81490120 0000000000000000 Call Trace: [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline] [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<ffffffff81490120>] print_address_description+0x6f/0x21b mm/kasan/report.c:252 [<ffffffff81490358>] kasan_report_error mm/kasan/report.c:351 [inline] [<ffffffff81490358>] kasan_report mm/kasan/report.c:408 [inline] [<ffffffff81490358>] kasan_report.cold+0x8c/0x2be mm/kasan/report.c:393 [<ffffffff81484eb4>] __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:428 [<ffffffff826bbd4c>] __ipv6_addr_type+0x26c/0x290 net/ipv6/addrconf_core.c:68 [<ffffffff826b141c>] ipv6_addr_type include/net/ipv6.h:330 [inline] [<ffffffff826b141c>] ip6_tnl_xmit2+0x2ac/0x2320 net/ipv6/ip6_tunnel.c:988 [<ffffffff826b4e59>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline] [<ffffffff826b4e59>] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212 [<ffffffff82245071>] __netdev_start_xmit include/linux/netdevice.h:3750 [inline] [<ffffffff82245071>] netdev_start_xmit include/linux/netdevice.h:3759 [inline] [<ffffffff82245071>] xmit_one net/core/dev.c:2781 [inline] [<ffffffff82245071>] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229 [<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263 [<ffffffff8225c136>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369 [<ffffffff823c5412>] dst_neigh_output include/net/dst.h:461 [inline] [<ffffffff823c5412>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213 [<ffffffff823cc6e2>] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288 [<ffffffff823d04a7>] NF_HOOK_COND include/linux/netfilter.h:240 [inline] [<ffffffff823d04a7>] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362 [<ffffffff823cd21c>] dst_output include/net/dst.h:498 [inline] [<ffffffff823cd21c>] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119 [<ffffffff823d300e>] ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1453 [<ffffffff82478ded>] udp_send_skb+0x4fd/0xc70 net/ipv4/udp.c:842 [<ffffffff8247fb9f>] udp_sendmsg+0x16cf/0x1c60 net/ipv4/udp.c:1072 [<ffffffff826137a2>] udpv6_sendmsg+0x12f2/0x24f0 net/ipv6/udp.c:1173 [<ffffffff824a8b42>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755 [<ffffffff821d838e>] sock_sendmsg_nosec net/socket.c:638 [inline] [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110 net/socket.c:648 [<ffffffff821da269>] ___sys_sendmsg+0x769/0x890 net/socket.c:1975 [<ffffffff821dd0c5>] __sys_sendmsg+0xc5/0x160 net/socket.c:2009 [<ffffffff821dd18d>] SYSC_sendmsg net/socket.c:2020 [inline] [<ffffffff821dd18d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2016 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a Allocated by task 2612: [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [<ffffffff81483f22>] save_stack mm/kasan/kasan.c:512 [inline] [<ffffffff81483f22>] set_track mm/kasan/kasan.c:524 [inline] [<ffffffff81483f22>] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616 [<ffffffff81484197>] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601 [<ffffffff81480521>] __kmalloc+0x141/0x330 mm/slub.c:3613 [<ffffffff82264216>] kmalloc include/linux/slab.h:481 [inline] [<ffffffff82264216>] kzalloc include/linux/slab.h:620 [inline] [<ffffffff82264216>] neigh_alloc net/core/neighbour.c:285 [inline] [<ffffffff82264216>] __neigh_create+0x1d6/0x1b30 net/core/neighbour.c:457 [<ffffffff823a024e>] neigh_create include/net/neighbour.h:313 [inline] [<ffffffff823a024e>] ipv4_neigh_lookup+0x52e/0x6e0 net/ipv4/route.c:464 [<ffffffff826b13eb>] dst_neigh_lookup include/net/dst.h:466 [inline] [<ffffffff826b13eb>] ip6_tnl_xmit2+0x27b/0x2320 net/ipv6/ip6_tunnel.c:982 [<ffffffff826b4e59>] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline] [<ffffffff826b4e59>] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212 [<ffffffff82245071>] __netdev_start_xmit include/linux/netdevice.h:3750 [inline] [<ffffffff82245071>] netdev_start_xmit include/linux/netdevice.h:3759 [inline] [<ffffffff82245071>] xmit_one net/core/dev.c:2781 [inline] [<ffffffff82245071>] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797 [<ffffffff822473cb>] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229 [<ffffffff82247948>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263 [<ffffffff8225c136>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369 [<ffffffff823c5412>] dst_neigh_output include/net/dst.h:461 [inline] [<ffffffff823c5412>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213 [<ffffffff823cc6e2>] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288 [<ffffffff823d04a7>] NF_HOOK_COND include/linux/netfilter.h:240 [inline] [<ffffffff823d04a7>] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362 [<ffffffff823cd21c>] dst_output include/net/dst.h:498 [inline] [<ffffffff823cd21c>] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119 [<ffffffff823d300e>] ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1453 [<ffffffff82478ded>] udp_send_skb+0x4fd/0xc70 net/ipv4/udp.c:842 [<ffffffff8247fb9f>] udp_sendmsg+0x16cf/0x1c60 net/ipv4/udp.c:1072 [<ffffffff826137a2>] udpv6_sendmsg+0x12f2/0x24f0 net/ipv6/udp.c:1173 [<ffffffff824a8b42>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755 [<ffffffff821d838e>] sock_sendmsg_nosec net/socket.c:638 [inline] [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110 net/socket.c:648 [<ffffffff821da269>] ___sys_sendmsg+0x769/0x890 net/socket.c:1975 [<ffffffff821dd0c5>] __sys_sendmsg+0xc5/0x160 net/socket.c:2009 [<ffffffff821dd18d>] SYSC_sendmsg net/socket.c:2020 [inline] [<ffffffff821dd18d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2016 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a Freed by task 2148: [<ffffffff8102e3c6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [<ffffffff81484820>] save_stack mm/kasan/kasan.c:512 [inline] [<ffffffff81484820>] set_track mm/kasan/kasan.c:524 [inline] [<ffffffff81484820>] kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:589 [<ffffffff81481c44>] slab_free_hook mm/slub.c:1383 [inline] [<ffffffff81481c44>] slab_free_freelist_hook mm/slub.c:1405 [inline] [<ffffffff81481c44>] slab_free mm/slub.c:2859 [inline] [<ffffffff81481c44>] kfree+0xf4/0x310 mm/slub.c:3749 [<ffffffff81409a1d>] kvfree+0x4d/0x60 mm/util.c:323 [<ffffffff8236dfdb>] xt_free_table_info+0x14b/0x1b0 net/netfilter/x_tables.c:1019 [<ffffffff82687e03>] __do_replace+0x413/0x650 net/ipv6/netfilter/ip6_tables.c:1260 [<ffffffff8268db91>] do_replace net/ipv6/netfilter/ip6_tables.c:1316 [inline] [<ffffffff8268db91>] do_ip6t_set_ctl+0x2e1/0x450 net/ipv6/netfilter/ip6_tables.c:1863 [<ffffffff822fcfad>] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline] [<ffffffff822fcfad>] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114 [<ffffffff826003eb>] ipv6_setsockopt net/ipv6/ipv6_sockglue.c:909 [inline] [<ffffffff826003eb>] ipv6_setsockopt+0x10b/0x140 net/ipv6/ipv6_sockglue.c:893 [<ffffffff823f782a>] tcp_setsockopt net/ipv4/tcp.c:2643 [inline] [<ffffffff823f782a>] tcp_setsockopt+0x8a/0xe0 net/ipv4/tcp.c:2637 [<ffffffff821def2a>] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2663 [<ffffffff821dcb59>] SYSC_setsockopt net/socket.c:1780 [inline] [<ffffffff821dcb59>] SyS_setsockopt+0x159/0x240 net/socket.c:1759 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a The buggy address belongs to the object at ffff8801d2b1c900 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 696 bytes inside of 1024-byte region [ffff8801d2b1c900, ffff8801d2b1cd00) The buggy address belongs to the page: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 2624 at kernel/locking/lockdep.c:3190 __lock_acquire+0x1878/0x4f50 kernel/locking/lockdep.c:3190() DEBUG_LOCKS_WARN_ON(id >= MAX_LOCKDEP_KEYS)