================================================================== BUG: KASAN: user-memory-access in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: user-memory-access in atomic_fetch_add_unless include/linux/atomic.h:575 [inline] BUG: KASAN: user-memory-access in atomic_add_unless include/linux/atomic.h:597 [inline] BUG: KASAN: user-memory-access in dst_hold_safe include/net/dst.h:308 [inline] BUG: KASAN: user-memory-access in ip6_hold_safe+0xca/0x620 net/ipv6/route.c:1021 Read of size 4 at addr 0000000000013264 by task syz-executor1/15446 CPU: 0 PID: 15446 Comm: syz-executor1 Not tainted 4.20.0+ #3 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+0x1db/0x2d0 lib/dump_stack.c:113 kasan_report_error mm/kasan/report.c:352 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x19f/0x2ba mm/kasan/report.c:396 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 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+0xca/0x620 net/ipv6/route.c:1021 rt6_get_pcpu_route net/ipv6/route.c:1241 [inline] ip6_pol_route+0x3a3/0x1490 net/ipv6/route.c:1890 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2066 fib6_rule_lookup+0x12f/0x870 net/ipv6/fib6_rules.c:118 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2095 ip6_route_output include/net/ip6_route.h:88 [inline] ip6_dst_lookup_tail+0xe18/0x1d50 net/ipv6/ip6_output.c:958 ip6_dst_lookup_flow+0xca/0x270 net/ipv6/ip6_output.c:1086 sctp_v6_get_dst+0x7d5/0x2240 net/sctp/ipv6.c:294 sctp_transport_route+0x132/0x370 net/sctp/transport.c:311 sctp_assoc_add_peer+0x5f7/0x10e0 net/sctp/associola.c:678 sctp_process_param net/sctp/sm_make_chunk.c:2543 [inline] sctp_process_init+0xe63/0x2910 net/sctp/sm_make_chunk.c:2356 sctp_sf_do_5_1D_ce+0x484/0x1490 net/sctp/sm_statefuns.c:782 sctp_do_sm+0x197/0x7020 net/sctp/sm_sideeffect.c:1188 sctp_endpoint_bh_rcv+0x471/0x9b0 net/sctp/endpointola.c:456 sctp_inq_push+0x288/0x3a0 net/sctp/inqueue.c:95 sctp_rcv+0x2cef/0x4010 net/sctp/input.c:271 sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1065 ip6_protocol_deliver_rcu+0x3aa/0x1940 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+0xf9/0x600 net/ipv6/ip6_input.c:443 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x177/0x330 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ipv6_rcv+0x113/0x650 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core+0x160/0x210 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+0x76d/0x1930 net/core/dev.c:6412 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027 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+0xca9/0x28e0 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+0x23c/0xa00 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+0xee1/0x24a0 net/ipv6/ip6_output.c:275 sctp_v6_xmit+0x3bf/0x780 net/sctp/ipv6.c:234 sctp_packet_transmit+0x1e49/0x3be0 net/sctp/output.c:641 sctp_outq_flush_transports net/sctp/outqueue.c:1161 [inline] sctp_outq_flush+0x564/0x3580 net/sctp/outqueue.c:1209 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+0x624/0x7020 net/sctp/sm_sideeffect.c:1191 sctp_assoc_bh_rcv+0x343/0x660 net/sctp/associola.c:1074 sctp_inq_push+0x288/0x3a0 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x196/0xd30 net/sctp/input.c:354 sk_backlog_rcv include/net/sock.h:932 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2284 release_sock+0xac/0x2b0 net/core/sock.c:2797 sctp_wait_for_connect+0x3ab/0x600 net/sctp/socket.c:8751 sctp_sendmsg_to_asoc+0x159a/0x1ad0 net/sctp/socket.c:1967 sctp_sendmsg+0x892/0x1dc0 net/sctp/socket.c:2113 inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 __sys_sendto+0x387/0x5f0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f41083a9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457ec9 RDX: 0000000000000001 RSI: 0000000020e33fe0 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 000000002005ffe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 00007f41083aa6d4 R13: 00000000004c53f5 R14: 00000000004d8ef0 R15: 00000000ffffffff ==================================================================