================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: slab-out-of-bounds in atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] BUG: KASAN: slab-out-of-bounds in atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] BUG: KASAN: slab-out-of-bounds in atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [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+0xb3/0x3a0 net/ipv6/route.c:1020 Read of size 4 at addr ffff88808f92efc4 by task syz-executor.5/16022 CPU: 1 PID: 16022 Comm: syz-executor.5 Not tainted 5.1.0-rc7+ #194 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: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: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:1020 rt6_get_pcpu_route net/ipv6/route.c:1242 [inline] ip6_pol_route+0x348/0x1080 net/ipv6/route.c:1901 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2077 fib6_rule_lookup+0x128/0x560 net/ipv6/fib6_rules.c:118 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2106 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_unexpected_init net/sctp/sm_statefuns.c:1556 [inline] sctp_sf_do_unexpected_init.isra.0+0x7cd/0x1350 net/sctp/sm_statefuns.c:1456 sctp_sf_do_5_2_1_siminit+0x35/0x40 net/sctp/sm_statefuns.c:1685 sctp_do_sm+0x12c/0x5500 net/sctp/sm_sideeffect.c:1162 sctp_assoc_bh_rcv+0x343/0x660 net/sctp/associola.c:1074 sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x196/0xbe0 net/sctp/input.c:354 sk_backlog_rcv include/net/sock.h:943 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2413 release_sock+0x59/0x1c0 net/core/sock.c:2929 sctp_wait_for_connect+0x316/0x540 net/sctp/socket.c:9048 __sctp_connect+0xac2/0xce0 net/sctp/socket.c:1241 sctp_connect net/sctp/socket.c:4858 [inline] sctp_inet_connect+0x2a2/0x340 net/sctp/socket.c:4874 __sys_connect+0x266/0x330 net/socket.c:1808 __do_sys_connect net/socket.c:1819 [inline] __se_sys_connect net/socket.c:1816 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1816 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 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:00007ff147eb7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9 RDX: 000000000000001c RSI: 0000000020000200 RDI: 0000000000000003 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff147eb86d4 R13: 00000000004bf1f1 R14: 00000000004d02c0 R15: 00000000ffffffff Allocated by task 13279: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3393 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3555 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:1222 [inline] rt6_make_pcpu_route net/ipv6/route.c:1252 [inline] ip6_pol_route+0x743/0x1080 net/ipv6/route.c:1904 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2077 fib6_rule_lookup+0x128/0x560 net/ipv6/fib6_rules.c:118 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2106 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/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+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 Freed by task 32: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3499 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3765 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:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x916/0x13a0 kernel/rcu/tree.c:2769 __do_softirq+0x266/0x95a kernel/softirq.c:293 The buggy address belongs to the object at ffff88808f92ee80 which belongs to the cache ip6_dst_cache of size 224 The buggy address is located 100 bytes to the right of 224-byte region [ffff88808f92ee80, ffff88808f92ef60) The buggy address belongs to the page: page:ffffea00023e4b80 count:1 mapcount:0 mapping:ffff88809b13a640 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00024ccfc8 ffffea0002614408 ffff88809b13a640 raw: 0000000000000000 ffff88808f92e0c0 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808f92ee80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808f92ef00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88808f92ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88808f92f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808f92f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================