================================================================== BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188 Read of size 8 at addr ffff888095501780 by task udevd/7632 CPU: 0 PID: 7632 Comm: udevd Not tainted 5.0.0-rc5+ #64 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 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188 dccp_sk_destruct+0x3f/0x90 net/dccp/proto.c:181 __sk_destruct+0x55/0x6d0 net/core/sock.c:1569 __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+0x928/0x1390 kernel/rcu/tree.c:2754 __do_softirq+0x266/0x95a kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:save_stack_address arch/x86/kernel/stacktrace.c:30 [inline] RIP: 0010:save_stack_address+0x2c/0x60 arch/x86/kernel/stacktrace.c:15 Code: d2 48 89 e5 41 54 49 89 f4 53 48 89 fb 75 2f 8b 43 10 85 c0 7f 1b 8b 03 3b 43 04 73 38 48 8b 53 08 8d 48 01 89 0b 4c 89 24 c2 <31> c0 5b 41 5c 5d c3 83 e8 01 89 43 10 5b 31 c0 41 5c 5d c3 48 89 RSP: 0018:ffff888080437758 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: ffff888080437818 RCX: 0000000000000003 RDX: ffff888080437830 RSI: ffffffff81a6bf2f RDI: ffff888080437818 RBP: ffff888080437768 R08: 0000000000000001 R09: ffff8880804377c8 R10: ffff8880804377a0 R11: ffff8880804377b0 R12: ffffffff81a6bf2f R13: 0000000000000000 R14: ffff888081572280 R15: ffff88812c3f0dc0 __save_stack_trace+0x6d/0xf0 arch/x86/kernel/stacktrace.c:46 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 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 mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc_node mm/slab.c:3324 [inline] kmem_cache_alloc_node_trace+0x13c/0x720 mm/slab.c:3650 __do_kmalloc_node mm/slab.c:3672 [inline] __kmalloc_node+0x3d/0x70 mm/slab.c:3680 kmalloc_node include/linux/slab.h:588 [inline] kvmalloc_node+0x68/0x100 mm/util.c:416 kvmalloc include/linux/mm.h:604 [inline] seq_buf_alloc fs/seq_file.c:32 [inline] seq_read+0x832/0x1130 fs/seq_file.c:204 kernfs_fop_read+0xed/0x560 fs/kernfs/file.c:252 __vfs_read+0x116/0x8c0 fs/read_write.c:416 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0xea/0x1f0 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f14b41d2310 Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 RSP: 002b:00007ffead315ba8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f14b41d2310 RDX: 0000000000001000 RSI: 00007ffead316050 RDI: 0000000000000005 RBP: 0000000001b50534 R08: 0000000001b50534 R09: 00007f14b4227c20 R10: 7269762f73656369 R11: 0000000000000246 R12: 0000000001b4f420 R13: 0000000001b4f510 R14: 0000000001aff030 R15: 0000000001b37a00 Allocated by task 14321: 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 mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 ccid_new+0x256/0x3f0 net/dccp/ccid.c:151 dccp_hdlr_ccid+0x27/0x150 net/dccp/feat.c:44 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538 dccp_rcv_request_sent_state_process net/dccp/input.c:472 [inline] dccp_rcv_state_process+0x116f/0x1931 net/dccp/input.c:680 dccp_v6_do_rcv+0x269/0xbf0 net/dccp/ipv6.c:641 sk_backlog_rcv include/net/sock.h:936 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2284 release_sock+0x59/0x1c0 net/core/sock.c:2800 inet_wait_for_connect net/ipv4/af_inet.c:588 [inline] __inet_stream_connect+0x59f/0xea0 net/ipv4/af_inet.c:680 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x266/0x330 net/socket.c:1662 __do_sys_connect net/socket.c:1673 [inline] __se_sys_connect net/socket.c:1670 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1670 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14321: 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] kmem_cache_free+0x86/0x260 mm/slab.c:3749 ccid_hc_tx_delete+0xc1/0x100 net/dccp/ccid.c:190 dccp_hdlr_ccid+0x7d/0x150 net/dccp/feat.c:53 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538 dccp_create_openreq_child+0x40c/0x570 net/dccp/minisocks.c:127 dccp_v6_request_recv_sock+0x214/0x1da0 net/dccp/ipv6.c:469 dccp_check_req+0x35c/0x6f0 net/dccp/minisocks.c:196 dccp_v6_rcv+0x6d7/0x191e net/dccp/ipv6.c:747 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: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+0x4fa/0x1070 net/core/dev.c:6412 __do_softirq+0x266/0x95a kernel/softirq.c:292 The buggy address belongs to the object at ffff888095501780 which belongs to the cache ccid2_hc_tx_sock of size 1240 The buggy address is located 0 bytes inside of 1240-byte region [ffff888095501780, ffff888095501c58) The buggy address belongs to the page: page:ffffea0002554000 count:1 mapcount:0 mapping:ffff888216502080 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00022ea488 ffffea000228d008 ffff888216502080 raw: 0000000000000000 ffff888095500180 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888095501680: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff888095501700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888095501780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb kobject: 'loop4' (000000009290e380): fill_kobj_path: path = '/devices/virtual/block/loop4' ^ ffff888095501800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888095501880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================