IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 hrtimer: interrupt took 31734 ns ================================================================== BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xe0/0x100 net/dccp/ccid.c:188 Read of size 8 at addr ffff8801c4985480 by task syz-executor1/5408 CPU: 0 PID: 5408 Comm: syz-executor1 Not tainted 4.19.0-rc5+ #35 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+0x1c4/0x2b4 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+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ccid_hc_tx_delete+0xe0/0x100 net/dccp/ccid.c:188 dccp_sk_destruct+0x3c/0x80 net/dccp/proto.c:181 __sk_destruct+0x107/0xa80 net/core/sock.c:1560 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2576 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2847 [inline] rcu_process_callbacks+0xf23/0x2670 kernel/rcu/tree.c:2864 __do_softirq+0x30b/0xad8 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1056 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864 RIP: 0033:0x45a3da Code: 25 18 00 00 00 00 74 01 f0 48 0f b1 3d af c0 5e 00 48 39 c2 75 da f3 c3 0f 1f 84 00 00 00 00 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 c7 c2 d4 ff ff ff f7 RSP: 002b:00007ffcc939fb38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 000000000000c8ff RCX: 000000000045a3da RDX: 0000000000000000 RSI: 00007ffcc939fb40 RDI: 0000000000000001 RBP: 000000000000011a R08: 0000000000000001 R09: 0000000000fe6940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000c8e5 R14: 0000000000000008 R15: 0000000000000001 Allocated by task 7115: 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/0x730 mm/slab.c:3554 ccid_new+0x25b/0x3e0 net/dccp/ccid.c:151 dccp_hdlr_ccid+0x27/0x150 net/dccp/feat.c:44 __dccp_feat_activate+0x188/0x280 net/dccp/feat.c:344 dccp_feat_activate_values+0x3c1/0x80a net/dccp/feat.c:1538 dccp_rcv_request_sent_state_process net/dccp/input.c:472 [inline] dccp_rcv_state_process+0x11d4/0x1a32 net/dccp/input.c:678 dccp_v6_do_rcv+0x271/0xbf0 net/dccp/ipv6.c:638 sk_backlog_rcv include/net/sock.h:931 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2336 release_sock+0xad/0x2c0 net/core/sock.c:2849 inet_wait_for_connect net/ipv4/af_inet.c:588 [inline] __inet_stream_connect+0x641/0x1150 net/ipv4/af_inet.c:680 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x37d/0x4c0 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7115: 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+0x83/0x290 mm/slab.c:3756 ccid_hc_tx_delete+0xc3/0x100 net/dccp/ccid.c:190 dccp_hdlr_ccid+0x7d/0x150 net/dccp/feat.c:53 __dccp_feat_activate+0x188/0x280 net/dccp/feat.c:344 dccp_feat_activate_values+0x3c1/0x80a net/dccp/feat.c:1538 dccp_create_openreq_child+0x47a/0x630 net/dccp/minisocks.c:127 dccp_v6_request_recv_sock+0x278/0x2020 net/dccp/ipv6.c:466 dccp_check_req+0x47d/0x6d0 net/dccp/minisocks.c:196 dccp_v6_rcv+0x874/0x1ce9 net/dccp/ipv6.c:744 ip6_input_finish+0x3fc/0x1aa0 net/ipv6/ip6_input.c:383 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_input+0xe9/0x600 net/ipv6/ip6_input.c:426 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x17a/0x330 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:287 [inline] ipv6_rcv+0x11e/0x650 net/ipv6/ip6_input.c:271 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4891 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5001 process_backlog+0x218/0x6f0 net/core/dev.c:5807 napi_poll net/core/dev.c:6227 [inline] net_rx_action+0x7c5/0x1950 net/core/dev.c:6293 __do_softirq+0x30b/0xad8 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801c4985480 which belongs to the cache ccid2_hc_tx_sock of size 1240 The buggy address is located 0 bytes inside of 1240-byte region [ffff8801c4985480, ffff8801c4985958) The buggy address belongs to the page: page:ffffea0007126100 count:1 mapcount:0 mapping:ffff8801caa0ea80 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006f2f488 ffffea0006eaa188 ffff8801caa0ea80 raw: 0000000000000000 ffff8801c4984400 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c4985380: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff8801c4985400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801c4985480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c4985500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c4985580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================