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 26788 ns ================================================================== BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xe0/0x100 net/dccp/ccid.c:188 Read of size 8 at addr ffff8801a9a15340 by task syz-executor0/4473 CPU: 0 PID: 4473 Comm: syz-executor0 Not tainted 4.19.0-rc1+ #212 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d 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+0x107/0xa60 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+0xf78/0x27c0 kernel/rcu/tree.c:2864 __do_softirq+0x2eb/0xa74 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x1d6/0x210 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x18e/0x6a0 arch/x86/kernel/apic/apic.c:1056 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864 RIP: 0010:__sanitizer_cov_trace_cmp4+0x16/0x20 kernel/kcov.c:162 Code: 48 89 e5 48 8b 4d 08 e8 08 ff ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 04 00 00 00 48 89 e5 48 8b 4d 08 e8 ea fe ff ff <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe bf 06 00 00 00 RSP: 0018:ffff8801d9fc7690 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffffff87f619ec RCX: ffffffff81787d42 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: ffff8801d9fc7690 R08: ffff8801c69f0140 R09: ffffed003629d6bc R10: ffffed003629d6bc R11: ffff8801b14eb5e3 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 map_id_up_base kernel/user_namespace.c:336 [inline] map_id_up+0x112/0x3e0 kernel/user_namespace.c:366 from_kuid+0x85/0xc0 kernel/user_namespace.c:414 i_uid_read include/linux/fs.h:1476 [inline] ext4_do_update_inode fs/ext4/inode.c:5194 [inline] ext4_mark_iloc_dirty+0x464/0x2f90 fs/ext4/inode.c:5815 ext4_mark_inode_dirty+0x246/0xab0 fs/ext4/inode.c:5994 ext4_mkdir+0x7b4/0xe60 fs/ext4/namei.c:2638 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3817 do_mkdirat+0x27b/0x310 fs/namei.c:3840 __do_sys_mkdir fs/namei.c:3856 [inline] __se_sys_mkdir fs/namei.c:3854 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3854 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4564c7 Code: 1f 40 00 b8 5a 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad c0 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8d c0 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe8db86a18 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000009687 RCX: 00000000004564c7 RDX: 00007ffe8db86a34 RSI: 00000000000001ff RDI: 00007ffe8db86a30 RBP: 0000000000000207 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000009 R13: 000000000000965f R14: 0000000000000046 R15: badc0ffeebadface Allocated by task 5066: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x710 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+0x184/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x3b6/0x839 net/dccp/feat.c:1538 dccp_create_openreq_child+0x47a/0x620 net/dccp/minisocks.c:127 dccp_v6_request_recv_sock+0x253/0x2040 net/dccp/ipv6.c:466 dccp_check_req+0x46e/0x6c0 net/dccp/minisocks.c:196 dccp_v6_rcv+0x88e/0x1d9c net/dccp/ipv6.c:744 ip6_input_finish+0x407/0x1a40 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:4892 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5002 process_backlog+0x219/0x760 net/core/dev.c:5808 napi_poll net/core/dev.c:6228 [inline] net_rx_action+0x799/0x1900 net/core/dev.c:6294 __do_softirq+0x2eb/0xa74 kernel/softirq.c:292 Freed by task 5067: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 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+0x86/0x280 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+0x184/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x3b6/0x839 net/dccp/feat.c:1538 dccp_create_openreq_child+0x47a/0x620 net/dccp/minisocks.c:127 dccp_v6_request_recv_sock+0x253/0x2040 net/dccp/ipv6.c:466 dccp_check_req+0x46e/0x6c0 net/dccp/minisocks.c:196 dccp_v6_rcv+0x88e/0x1d9c net/dccp/ipv6.c:744 ip6_input_finish+0x407/0x1a40 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:4892 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5002 process_backlog+0x219/0x760 net/core/dev.c:5808 napi_poll net/core/dev.c:6228 [inline] net_rx_action+0x799/0x1900 net/core/dev.c:6294 __do_softirq+0x2eb/0xa74 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801a9a15340 which belongs to the cache ccid2_hc_tx_sock of size 1240 The buggy address is located 0 bytes inside of 1240-byte region [ffff8801a9a15340, ffff8801a9a15818) The buggy address belongs to the page: page:ffffea0006a68500 count:1 mapcount:0 mapping:ffff8801cda94e40 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00073f6008 ffffea00073e3108 ffff8801cda94e40 raw: 0000000000000000 ffff8801a9a142c0 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a9a15200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801a9a15280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801a9a15300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801a9a15380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801a9a15400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================