================================================================== 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:297 [inline] BUG: KASAN: null-ptr-deref in ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1050 Read of size 4 at addr 00000000000000e3 by task syz-executor.4/24506 CPU: 1 PID: 24506 Comm: syz-executor.4 Not tainted 5.1.0+ #4 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 kasan_report+0x12/0x20 mm/kasan/common.c:614 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:94 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:297 [inline] ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1050 rt6_get_pcpu_route net/ipv6/route.c:1277 [inline] ip6_pol_route+0x339/0xfa0 net/ipv6/route.c:1936 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2112 fib6_rule_lookup+0x136/0x5a0 net/ipv6/fib6_rules.c:116 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2141 ip6_route_output include/net/ip6_route.h:89 [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:2546 [inline] sctp_process_init+0x249f/0x2b20 net/sctp/sm_make_chunk.c:2359 sctp_sf_do_5_1B_init+0x8ba/0xe50 net/sctp/sm_statefuns.c:416 sctp_do_sm+0x12c/0x5500 net/sctp/sm_sideeffect.c:1162 sctp_endpoint_bh_rcv+0x451/0x950 net/sctp/endpointola.c:458 sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95 sctp_rcv+0x2853/0x3600 net/sctp/input.c:271 sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1064 ip6_protocol_deliver_rcu+0x1019/0x1720 net/ipv6/ip6_input.c:401 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:442 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:451 dst_input include/net/dst.h:439 [inline] ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:80 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:276 __netif_receive_skb_one_core+0x12a/0x1f0 net/core/dev.c:4990 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5104 process_backlog+0x206/0x750 net/core/dev.c:5944 napi_poll net/core/dev.c:6367 [inline] net_rx_action+0x4fa/0x1070 net/core/dev.c:6433 __do_softirq+0x266/0x95a kernel/softirq.c:293 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1026 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+0x109e/0x2550 net/ipv6/ip6_output.c:121 ip6_finish_output+0x579/0xc30 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:433 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [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:1791 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1194 [inline] sctp_do_sm+0x265c/0x5500 net/sctp/sm_sideeffect.c:1165 sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:88 sctp_sendmsg_to_asoc+0xc50/0x1f10 net/sctp/socket.c:1927 sctp_sendmsg+0xda7/0x1800 net/sctp/socket.c:2117 inet_sendmsg+0x147/0x5e0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:660 [inline] sock_sendmsg+0xf2/0x170 net/socket.c:671 __sys_sendto+0x262/0x380 net/socket.c:1964 __do_sys_sendto net/socket.c:1976 [inline] __se_sys_sendto net/socket.c:1972 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1972 do_syscall_64+0x103/0x670 arch/x86/entry/common.c:298 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 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:00007f5aa90e7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000458da9 RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000020000200 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5aa90e86d4 R13: 00000000004c672c R14: 00000000004db0f0 R15: 00000000ffffffff ==================================================================