audit: type=1400 audit(1538166432.101:40): avc: denied { name_connect } for pid=7055 comm="syz-executor3" dest=20000 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1
hrtimer: interrupt took 31333 ns
==================================================================
BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xe0/0x100 net/dccp/ccid.c:188
Read of size 8 at addr ffff8801b9e610c0 by task ksoftirqd/1/18
CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.19.0-rc5+ #37
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+0x115/0xbd0 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
run_ksoftirqd+0x94/0x100 kernel/softirq.c:653
smpboot_thread_fn+0x68b/0xa00 kernel/smpboot.c:164
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Allocated by task 8487:
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 8499:
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+0x217/0x760 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 ffff8801b9e610c0
which belongs to the cache ccid2_hc_tx_sock of size 1240
The buggy address is located 0 bytes inside of
1240-byte region [ffff8801b9e610c0, ffff8801b9e61598)
The buggy address belongs to the page:
page:ffffea0006e79800 count:1 mapcount:0 mapping:ffff8801cafcd4c0 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801cae8c248 ffffea00071ff808 ffff8801cafcd4c0
raw: 0000000000000000 ffff8801b9e60040 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801b9e60f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801b9e61000: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801b9e61080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff8801b9e61100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801b9e61180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================