==================================================================
BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
BUG: KASAN: slab-out-of-bounds in atomic_fetch_add_unless include/linux/atomic.h:575 [inline]
BUG: KASAN: slab-out-of-bounds in atomic_add_unless include/linux/atomic.h:597 [inline]
BUG: KASAN: slab-out-of-bounds in dst_hold_safe include/net/dst.h:308 [inline]
BUG: KASAN: slab-out-of-bounds in ip6_hold_safe+0xa7/0x3a0 net/ipv6/route.c:1023
Read of size 4 at addr ffff8880865ffede by task syz-executor.4/3553

CPU: 0 PID: 3553 Comm: syz-executor.4 Not tainted 5.0.0+ #97
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x123/0x190 mm/kasan/generic.c:191
 kasan_check_read+0x11/0x20 mm/kasan/common.c:100
 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
 atomic_fetch_add_unless include/linux/atomic.h:575 [inline]
 atomic_add_unless include/linux/atomic.h:597 [inline]
 dst_hold_safe include/net/dst.h:308 [inline]
 ip6_hold_safe+0xa7/0x3a0 net/ipv6/route.c:1023
 rt6_get_pcpu_route net/ipv6/route.c:1243 [inline]
 ip6_pol_route+0x33d/0xf00 net/ipv6/route.c:1904
 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2080
 __fib6_rule_action net/ipv6/fib6_rules.c:233 [inline]
 fib6_rule_action+0x3ac/0xab0 net/ipv6/fib6_rules.c:264
 fib_rules_lookup+0x351/0xa90 net/core/fib_rules.c:304
 fib6_rule_lookup+0x33c/0x560 net/ipv6/fib6_rules.c:110
IPVS: set_ctl: invalid protocol: 29 0.0.3.255:20004
 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2109
 ip6_route_output include/net/ip6_route.h:88 [inline]
 ip6_dst_lookup_tail+0xd10/0x1b30 net/ipv6/ip6_output.c:964
IPVS: set_ctl: invalid protocol: 29 0.0.3.255:20004
 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1092
 sctp_v6_get_dst+0x785/0x1d80 net/sctp/ipv6.c:293
 sctp_transport_route+0x132/0x370 net/sctp/transport.c:312
 sctp_assoc_add_peer+0x53e/0xfc0 net/sctp/associola.c:678
 sctp_process_param net/sctp/sm_make_chunk.c:2548 [inline]
 sctp_process_init+0x249f/0x2b20 net/sctp/sm_make_chunk.c:2361
 sctp_sf_do_5_1B_init+0x8ba/0xe50 net/sctp/sm_statefuns.c:416
 sctp_do_sm+0x124/0x5390 net/sctp/sm_sideeffect.c:1188
 sctp_endpoint_bh_rcv+0x451/0x950 net/sctp/endpointola.c:456
 sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95
 sctp_rcv+0x27d9/0x3550 net/sctp/input.c:271
 sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1063
 ip6_protocol_deliver_rcu+0x303/0x16c0 net/ipv6/ip6_input.c:394
 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:443
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 process_backlog+0x206/0x750 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
 __do_softirq+0x266/0x95a kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027
 </IRQ>
 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337
 do_softirq kernel/softirq.c:329 [inline]
 __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline]
 ip6_finish_output2+0xbcf/0x2550 net/ipv6/ip6_output.c:121
 ip6_finish_output+0x577/0xc30 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:444 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ip6_xmit+0xe41/0x20c0 net/ipv6/ip6_output.c:275
 sctp_v6_xmit+0x313/0x660 net/sctp/ipv6.c:232
 sctp_packet_transmit+0x1b8b/0x3660 net/sctp/output.c:641
 sctp_packet_singleton net/sctp/outqueue.c:787 [inline]
 sctp_outq_flush_ctrl.constprop.0+0x741/0xd40 net/sctp/outqueue.c:918
 sctp_outq_flush+0xe8/0x2790 net/sctp/outqueue.c:1200
 sctp_outq_uncork+0x6c/0x80 net/sctp/outqueue.c:772
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x513/0x5390 net/sctp/sm_sideeffect.c:1191
 sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:88
 __sctp_connect+0x8cd/0xce0 net/sctp/socket.c:1226
 __sctp_setsockopt_connectx+0x133/0x1a0 net/sctp/socket.c:1349
 sctp_setsockopt_connectx_old net/sctp/socket.c:1365 [inline]
 sctp_setsockopt net/sctp/socket.c:4617 [inline]
 sctp_setsockopt+0x22cc/0x68a0 net/sctp/socket.c:4581
 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3120
 __sys_setsockopt+0x180/0x280 net/socket.c:1923
 __do_sys_setsockopt net/socket.c:1934 [inline]
 __se_sys_setsockopt net/socket.c:1931 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1931
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457f29
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa8d9446c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457f29
RDX: 000000000000006b RSI: 0000000000000084 RDI: 0000000000000005
RBP: 000000000073c040 R08: 000000000000001c R09: 0000000000000000
R10: 000000002055bfe4 R11: 0000000000000246 R12: 00007fa8d94476d4
R13: 00000000004ccac8 R14: 00000000004da830 R15: 00000000ffffffff

Allocated by task 24734:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:503
 slab_post_alloc_hook mm/slab.h:440 [inline]
 slab_alloc mm/slab.c:3388 [inline]
 kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3548
 dst_alloc+0x10e/0x200 net/core/dst.c:109
 ip6_dst_alloc+0x34/0xa0 net/ipv6/route.c:355
 ip6_rt_pcpu_alloc net/ipv6/route.c:1223 [inline]
 rt6_make_pcpu_route net/ipv6/route.c:1253 [inline]
 ip6_pol_route+0x672/0xf00 net/ipv6/route.c:1907
 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2080
 fib6_rule_lookup+0x128/0x560 net/ipv6/fib6_rules.c:118
 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2109
 ip6_route_output include/net/ip6_route.h:88 [inline]
 ip6_dst_lookup_tail+0xd10/0x1b30 net/ipv6/ip6_output.c:964
 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1092
 sctp_v6_get_dst+0x785/0x1d80 net/sctp/ipv6.c:293
 sctp_transport_route+0x132/0x370 net/sctp/transport.c:312
 sctp_assoc_add_peer+0x53e/0xfc0 net/sctp/associola.c:678
 sctp_process_param net/sctp/sm_make_chunk.c:2548 [inline]
 sctp_process_init+0x249f/0x2b20 net/sctp/sm_make_chunk.c:2361
 sctp_sf_do_5_1B_init+0x8ba/0xe50 net/sctp/sm_statefuns.c:416
 sctp_do_sm+0x124/0x5390 net/sctp/sm_sideeffect.c:1188
 sctp_endpoint_bh_rcv+0x451/0x950 net/sctp/endpointola.c:456
 sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95
 sctp_rcv+0x27d9/0x3550 net/sctp/input.c:271
 sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1063
 ip6_protocol_deliver_rcu+0x303/0x16c0 net/ipv6/ip6_input.c:394
 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:443
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 process_backlog+0x206/0x750 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
 __do_softirq+0x266/0x95a kernel/softirq.c:292

Freed by task 21755:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465
 __cache_free mm/slab.c:3494 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3754
 dst_destroy+0x2a0/0x3c0 net/core/dst.c:145
 dst_destroy_rcu+0x16/0x19 net/core/dst.c:158
 __rcu_reclaim kernel/rcu/rcu.h:240 [inline]
 rcu_do_batch kernel/rcu/tree.c:2452 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline]
 rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754
 __do_softirq+0x266/0x95a kernel/softirq.c:292

The buggy address belongs to the object at ffff8880865ffdc0
 which belongs to the cache ip6_dst_cache of size 224
The buggy address is located 62 bytes to the right of
 224-byte region [ffff8880865ffdc0, ffff8880865ffea0)
The buggy address belongs to the page:
page:ffffea0002197fc0 count:1 mapcount:0 mapping:ffff8882164b3840 index:0xffff8880865ffa00
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002486a08 ffffea00025fbb48 ffff8882164b3840
raw: ffff8880865ffa00 ffff8880865ff000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880865ffd80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8880865ffe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880865ffe80: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                                                    ^
 ffff8880865fff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880865fff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================