================================================================== BUG: KASAN: slab-out-of-bounds in ip6_dst_lookup_tail+0x196a/0x1b30 net/ipv6/ip6_output.c:1071 Read of size 8 at addr ffff8880a3e811ff by task syz-executor.2/11593 CPU: 1 PID: 11593 Comm: syz-executor.2 Not tainted 5.2.0-rc2+ #12 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 ip6_dst_lookup_tail+0x196a/0x1b30 net/ipv6/ip6_output.c:1071 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1155 sctp_v6_get_dst+0x15c1/0x1d80 net/sctp/ipv6.c:331 sctp_transport_route+0x12d/0x360 net/sctp/transport.c:297 sctp_packet_config+0xb8c/0xfd0 net/sctp/output.c:103 sctp_outq_select_transport+0x1f1/0x790 net/sctp/outqueue.c:858 sctp_outq_flush_ctrl.constprop.0+0x2c7/0xd30 net/sctp/outqueue.c:892 sctp_outq_flush+0xe8/0x2780 net/sctp/outqueue.c:1185 sctp_outq_uncork+0x6c/0x80 net/sctp/outqueue.c:757 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1776 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1179 [inline] sctp_do_sm+0x504/0x50e0 net/sctp/sm_sideeffect.c:1150 sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0xc50/0x1f10 net/sctp/socket.c:1912 sctp_sendmsg+0x109a/0x17d0 net/sctp/socket.c:2102 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:671 ___sys_sendmsg+0x803/0x920 net/socket.c:2292 __sys_sendmsg+0x105/0x1d0 net/socket.c:2330 __do_sys_sendmsg net/socket.c:2339 [inline] __se_sys_sendmsg net/socket.c:2337 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2337 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007eff7fafcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279 RDX: 0000000020008844 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007eff7fafd6d4 R13: 00000000004c6c94 R14: 00000000004dba90 R15: 00000000ffffffff Allocated by task 9153: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3326 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3488 dst_alloc+0x10e/0x200 net/core/dst.c:93 ip6_dst_alloc+0x34/0xa0 net/ipv6/route.c:356 icmp6_dst_alloc+0x1a9/0x660 net/ipv6/route.c:2806 ndisc_send_skb+0xfc1/0x14a0 net/ipv6/ndisc.c:488 ndisc_send_ns+0x3a9/0x850 net/ipv6/ndisc.c:650 rt6_probe_deferred+0xe3/0x1a0 net/ipv6/route.c:543 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 11251: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3698 dst_destroy+0x29e/0x3c0 net/core/dst.c:129 dst_destroy_rcu+0x16/0x19 net/core/dst.c:142 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2092 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline] rcu_core+0xba5/0x1500 kernel/rcu/tree.c:2291 __do_softirq+0x25c/0x94c kernel/softirq.c:293 The buggy address belongs to the object at ffff8880a3e810c0 which belongs to the cache ip6_dst_cache of size 224 The buggy address is located 95 bytes to the right of 224-byte region [ffff8880a3e810c0, ffff8880a3e811a0) The buggy address belongs to the page: page:ffffea00028fa040 refcount:1 mapcount:0 mapping:ffff88809bd52380 index:0xffff8880a3e81e80 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002a45a88 ffffea0002810088 ffff88809bd52380 raw: ffff8880a3e81e80 ffff8880a3e810c0 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a3e81080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8880a3e81100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a3e81180: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a3e81200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a3e81280: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ==================================================================