================================================================== BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xd5/0xf0 net/dccp/ccid.c:188 Read of size 8 at addr ffff8801ba717800 by task syz-executor4/21627 CPU: 1 PID: 21627 Comm: syz-executor4 Not tainted 4.18.0-rc1-syzkaller #0 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+0x16e/0x22a lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ccid_hc_tx_delete+0xd5/0xf0 net/dccp/ccid.c:188 dccp_sk_destruct+0x37/0x80 net/dccp/proto.c:181 __sk_destruct+0xf6/0xa00 net/core/sock.c:1573 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2558 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline] rcu_process_callbacks+0xe9f/0x1710 kernel/rcu/tree.c:2802 __do_softirq+0x308/0xb7b kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x19e/0x1f0 kernel/softirq.c:404 exiting_irq arch/x86/include/asm/apic.h:527 [inline] smp_apic_timer_interrupt+0x1b7/0x7e0 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:67 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffff8801bd667528 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 1ffff10037c21b00 RBX: ffffed0037c21b3d RCX: 0000000000000000 RDX: 000000000000001d RSI: 0000000000000000 RDI: ffffed0037c21b3d RBP: ffff8801bd667540 R08: 0000000000000068 R09: ffffed0037c21b20 R10: 000000002e8671ce R11: ffff8801dad23953 R12: 00000000000000e8 R13: ffff8801be10d900 R14: ffff8801be10d9e7 R15: ffff8801be10d9e7 kasan_kmalloc+0x4a/0xe0 mm/kasan/kasan.c:548 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3554 skb_clone+0x19e/0x490 net/core/skbuff.c:1282 dccp_skb_entail+0x85/0xb0 net/dccp/output.c:37 dccp_connect+0x345/0x690 net/dccp/output.c:564 dccp_v6_connect+0x159c/0x1d00 net/dccp/ipv6.c:947 __inet_stream_connect+0x7ff/0x1000 net/ipv4/af_inet.c:655 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x2f9/0x500 net/socket.c:1709 __do_sys_connect net/socket.c:1720 [inline] __se_sys_connect net/socket.c:1717 [inline] __x64_sys_connect+0x6e/0xb0 net/socket.c:1717 do_syscall_64+0x183/0x700 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4577a9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f16f97b4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004577a9 RDX: 000000000000001c RSI: 0000000020419000 RDI: 000000000000000a RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f16f97b56d4 R13: 00000000004bdcc7 R14: 00000000004cd6d8 R15: 00000000ffffffff Allocated by task 21615: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3554 ccid_new+0x1d5/0x360 net/dccp/ccid.c:151 dccp_hdlr_ccid+0x1e/0x110 net/dccp/feat.c:44 __dccp_feat_activate+0x11b/0x240 net/dccp/feat.c:344 dccp_feat_activate_values+0x2dd/0x779 net/dccp/feat.c:1538 dccp_rcv_request_sent_state_process net/dccp/input.c:472 [inline] dccp_rcv_state_process+0xde2/0x1675 net/dccp/input.c:678 dccp_v6_do_rcv+0x1ef/0xbb0 net/dccp/ipv6.c:638 sk_backlog_rcv include/net/sock.h:914 [inline] __release_sock+0x110/0x330 net/core/sock.c:2342 release_sock+0xa3/0x290 net/core/sock.c:2851 inet_wait_for_connect net/ipv4/af_inet.c:588 [inline] __inet_stream_connect+0x55a/0x1000 net/ipv4/af_inet.c:680 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x2f9/0x500 net/socket.c:1709 __do_sys_connect net/socket.c:1720 [inline] __se_sys_connect net/socket.c:1717 [inline] __x64_sys_connect+0x6e/0xb0 net/socket.c:1717 do_syscall_64+0x183/0x700 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21615: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x2d0 mm/slab.c:3756 ccid_hc_tx_delete+0xac/0xf0 net/dccp/ccid.c:190 dccp_hdlr_ccid+0x60/0x110 net/dccp/feat.c:53 __dccp_feat_activate+0x11b/0x240 net/dccp/feat.c:344 dccp_feat_activate_values+0x2dd/0x779 net/dccp/feat.c:1538 dccp_create_openreq_child+0x467/0x600 net/dccp/minisocks.c:127 dccp_v6_request_recv_sock+0x20b/0x1e30 net/dccp/ipv6.c:466 dccp_check_req+0x2a3/0x730 net/dccp/minisocks.c:196 dccp_v6_rcv+0x6e7/0x1e0c net/dccp/ipv6.c:744 ip6_input_finish+0x346/0x1740 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_input+0xda/0x570 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x1f5/0x850 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:287 [inline] ipv6_rcv+0xf52/0x2510 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1fba/0x3620 net/core/dev.c:4628 __netif_receive_skb+0x1f/0x1a0 net/core/dev.c:4693 process_backlog+0x1ca/0x6d0 net/core/dev.c:5373 napi_poll net/core/dev.c:5771 [inline] net_rx_action+0x758/0x1850 net/core/dev.c:5837 __do_softirq+0x308/0xb7b kernel/softirq.c:284 The buggy address belongs to the object at ffff8801ba717800 which belongs to the cache ccid2_hc_tx_sock of size 1240 The buggy address is located 0 bytes inside of 1240-byte region [ffff8801ba717800, ffff8801ba717cd8) The buggy address belongs to the page: page:ffffea0006e9c580 count:1 mapcount:0 mapping:ffff8801c5c37600 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006f36788 ffffea000737d308 ffff8801c5c37600 raw: 0000000000000000 ffff8801ba716200 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ba717700: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff8801ba717780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801ba717800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801ba717880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ba717900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================