================================================================== BUG: KASAN: null-ptr-deref in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: null-ptr-deref in atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] BUG: KASAN: null-ptr-deref in atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] BUG: KASAN: null-ptr-deref in atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] BUG: KASAN: null-ptr-deref in dst_hold_safe include/net/dst.h:308 [inline] BUG: KASAN: null-ptr-deref in ip6_hold_safe+0xb3/0x3a0 net/ipv6/route.c:1023 Read of size 4 at addr 0000000000000131 by task syz-executor.0/29601 CPU: 1 PID: 29601 Comm: syz-executor.0 Not tainted 5.1.0-rc5+ #175 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 kasan_report.cold+0x5/0x40 mm/kasan/report.c:321 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:102 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] dst_hold_safe include/net/dst.h:308 [inline] ip6_hold_safe+0xb3/0x3a0 net/ipv6/route.c:1023 rt6_get_pcpu_route net/ipv6/route.c:1245 [inline] ip6_pol_route+0x348/0x1040 net/ipv6/route.c:1906 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2082 fib6_rule_lookup+0x128/0x560 net/ipv6/fib6_rules.c:118 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2111 ip6_route_output include/net/ip6_route.h:88 [inline] ip6_dst_lookup_tail+0xd10/0x1b30 net/ipv6/ip6_output.c:966 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1094 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+0x12c/0x5770 net/sctp/sm_sideeffect.c:1188 sctp_endpoint_bh_rcv+0x451/0x950 net/sctp/endpointola.c:458 sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95 sctp_rcv+0x2850/0x3600 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:4987 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5099 process_backlog+0x206/0x750 net/core/dev.c:5939 napi_poll net/core/dev.c:6362 [inline] net_rx_action+0x4fa/0x1070 net/core/dev.c:6428 __do_softirq+0x266/0x95a kernel/softirq.c:293 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:338 do_softirq kernel/softirq.c:330 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:190 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:684 [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+0x1bc4/0x36f0 net/sctp/output.c:641 sctp_packet_singleton net/sctp/outqueue.c:787 [inline] sctp_outq_flush_ctrl.constprop.0+0x6d4/0xd50 net/sctp/outqueue.c:918 sctp_outq_flush+0xe8/0x2780 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+0x2575/0x5770 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:4656 [inline] sctp_setsockopt+0x15db/0x6fe0 net/sctp/socket.c:4620 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3120 __sys_setsockopt+0x180/0x280 net/socket.c:2046 __do_sys_setsockopt net/socket.c:2057 [inline] __se_sys_setsockopt net/socket.c:2054 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2054 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 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:00007fb5b08dbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458c29 RDX: 000000000000006b RSI: 0000000000000084 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 000000000000001c R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00007fb5b08dc6d4 R13: 00000000004ce088 R14: 00000000004dc200 R15: 00000000ffffffff ==================================================================