================================================================== BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:704 [inline] BUG: KASAN: use-after-free in hlist_del_init include/linux/list.h:717 [inline] BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x9a4/0xa00 net/xfrm/xfrm_policy.c:2213 Write of size 8 at addr ffff888093610870 by task syz-executor2/17459 CPU: 1 PID: 17459 Comm: syz-executor2 Not tainted 5.0.0-rc3+ #33 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 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140 __hlist_del include/linux/list.h:704 [inline] hlist_del_init include/linux/list.h:717 [inline] __xfrm_policy_unlink+0x9a4/0xa00 net/xfrm/xfrm_policy.c:2213 xfrm_policy_flush+0x331/0x460 net/xfrm/xfrm_policy.c:1789 pfkey_spdflush+0xaf/0x3c0 net/key/af_key.c:2785 pfkey_process+0x6d2/0x810 net/key/af_key.c:2844 pfkey_sendmsg+0x5bb/0xfc0 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x409/0x910 net/socket.c:2116 __sys_sendmmsg+0x246/0x730 net/socket.c:2211 __do_sys_sendmmsg net/socket.c:2240 [inline] __se_sys_sendmmsg net/socket.c:2237 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2237 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 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:00007f810ad8fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458099 RDX: 0400000000000002 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f810ad906d4 R13: 00000000004c4f7c R14: 00000000004d8a40 R15: 00000000ffffffff Allocated by task 16662: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] sctp_transport_new+0x11a/0x890 net/sctp/transport.c:111 sctp_assoc_add_peer+0x2d9/0x10e0 net/sctp/associola.c:637 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_1B_init+0x908/0xf80 net/sctp/sm_statefuns.c:416 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:1062 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 Freed by task 9: 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:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 sctp_transport_destroy_rcu+0x48/0x60 net/sctp/transport.c:163 __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+0xc4a/0x1680 kernel/rcu/tree.c:2754 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 The buggy address belongs to the object at ffff8880936104c0 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 944 bytes inside of 1024-byte region [ffff8880936104c0, ffff8880936108c0) The buggy address belongs to the page: page:ffffea00024d8400 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0xffff888093611240 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002509088 ffffea0002782108 ffff88812c3f0ac0 raw: ffff888093611240 ffff888093610040 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888093610700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093610780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888093610800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888093610880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888093610900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================