==================================================================
BUG: KASAN: slab-use-after-free in dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline]
BUG: KASAN: slab-use-after-free in ccid2_hc_tx_packet_recv+0x22e6/0x2650 net/dccp/ccids/ccid2.c:592
Read of size 1 at addr ffff888015b384ab by task syz-executor.1/31991
CPU: 1 PID: 31991 Comm: syz-executor.1 Not tainted 6.3.0-syzkaller-13379-ged23734c23d2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
print_report mm/kasan/report.c:462 [inline]
kasan_report+0x11c/0x130 mm/kasan/report.c:572
dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline]
ccid2_hc_tx_packet_recv+0x22e6/0x2650 net/dccp/ccids/ccid2.c:592
ccid_hc_tx_packet_recv net/dccp/ccid.h:189 [inline]
dccp_deliver_input_to_ccids+0x1eb/0x260 net/dccp/input.c:182
dccp_rcv_established net/dccp/input.c:374 [inline]
dccp_rcv_established+0x10b/0x160 net/dccp/input.c:364
dccp_v6_do_rcv+0xb75/0xe80 net/dccp/ipv6.c:620
sk_backlog_rcv include/net/sock.h:1113 [inline]
__sk_receive_skb+0x298/0xb60 net/core/sock.c:565
dccp_v6_rcv+0xe42/0x1320 net/dccp/ipv6.c:789
ip6_protocol_deliver_rcu+0x2e7/0x1250 net/ipv6/ip6_input.c:437
ip6_input_finish+0x150/0x2f0 net/ipv6/ip6_input.c:482
NF_HOOK include/linux/netfilter.h:303 [inline]
NF_HOOK include/linux/netfilter.h:297 [inline]
ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:491
dst_input include/net/dst.h:468 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:303 [inline]
NF_HOOK include/linux/netfilter.h:297 [inline]
ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605
process_backlog+0x101/0x670 net/core/dev.c:5933
__napi_poll+0xb7/0x6f0 net/core/dev.c:6496
napi_poll net/core/dev.c:6563 [inline]
net_rx_action+0x8a9/0xcb0 net/core/dev.c:6696
__do_softirq+0x1d4/0x905 kernel/softirq.c:571
do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
do_softirq kernel/softirq.c:464 [inline]
__local_bh_enable_ip+0x106/0x130 kernel/softirq.c:396
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:843 [inline]
__dev_queue_xmit+0x1e20/0x3b10 net/core/dev.c:4271
dev_queue_xmit include/linux/netdevice.h:3085 [inline]
neigh_hh_output include/net/neighbour.h:528 [inline]
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0xfbd/0x1560 net/ipv6/ip6_output.c:134
__ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
ip6_finish_output+0x69a/0x1170 net/ipv6/ip6_output.c:206
NF_HOOK_COND include/linux/netfilter.h:292 [inline]
ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
dst_output include/net/dst.h:458 [inline]
NF_HOOK include/linux/netfilter.h:303 [inline]
NF_HOOK include/linux/netfilter.h:297 [inline]
ip6_xmit+0x11e5/0x1c80 net/ipv6/ip6_output.c:343
inet6_csk_xmit+0x3b4/0x730 net/ipv6/inet6_connection_sock.c:135
dccp_transmit_skb+0xcfe/0x1450 net/dccp/output.c:138
dccp_send_close+0x1f4/0x400 net/dccp/output.c:708
dccp_terminate_connection net/dccp/proto.c:965 [inline]
dccp_close+0x928/0xd80 net/dccp/proto.c:1028
inet_release+0x132/0x270 net/ipv4/af_inet.c:426
inet6_release+0x50/0x70 net/ipv6/af_inet6.c:480
__sock_release+0xcd/0x290 net/socket.c:653
sock_close+0x1c/0x20 net/socket.c:1397
__fput+0x27c/0xa90 fs/file_table.c:321
task_work_run+0x16f/0x270 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ffa5863e01b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffc33a1edd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007ffa5863e01b
RDX: 0000000000000000 RSI: 0000001b31923598 RDI: 0000000000000004
RBP: 00007ffa587ad980 R08: 0000000000000000 R09: 0000000011016f1d
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000000d8250
R13: 00007ffc33a1eed0 R14: 00007ffa587ac050 R15: 0000000000000032
Allocated by task 21:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
____kasan_kmalloc mm/kasan/common.c:333 [inline]
__kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:196 [inline]
__do_kmalloc_node mm/slab_common.c:966 [inline]
__kmalloc_node_track_caller+0x5f/0x1a0 mm/slab_common.c:986
kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:585
__alloc_skb+0x129/0x330 net/core/skbuff.c:654
alloc_skb include/linux/skbuff.h:1288 [inline]
dccp_send_ack.part.0+0x75/0x2f0 net/dccp/output.c:585
dccp_send_ack+0x57/0x70 net/dccp/output.c:584
ccid2_hc_rx_packet_recv+0x134/0x1b0 net/dccp/ccids/ccid2.c:771
ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline]
dccp_deliver_input_to_ccids+0xe1/0x260 net/dccp/input.c:176
dccp_rcv_established net/dccp/input.c:374 [inline]
dccp_rcv_established+0x10b/0x160 net/dccp/input.c:364
dccp_v6_do_rcv+0xb75/0xe80 net/dccp/ipv6.c:620
sk_backlog_rcv include/net/sock.h:1113 [inline]
__sk_receive_skb+0x298/0xb60 net/core/sock.c:565
dccp_v6_rcv+0xe42/0x1320 net/dccp/ipv6.c:789
ip6_protocol_deliver_rcu+0x2e7/0x1250 net/ipv6/ip6_input.c:437
ip6_input_finish+0x150/0x2f0 net/ipv6/ip6_input.c:482
NF_HOOK include/linux/netfilter.h:303 [inline]
NF_HOOK include/linux/netfilter.h:297 [inline]
ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:491
dst_input include/net/dst.h:468 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:303 [inline]
NF_HOOK include/linux/netfilter.h:297 [inline]
ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605
process_backlog+0x101/0x670 net/core/dev.c:5933
__napi_poll+0xb7/0x6f0 net/core/dev.c:6496
napi_poll net/core/dev.c:6563 [inline]
net_rx_action+0x8a9/0xcb0 net/core/dev.c:6696
__do_softirq+0x1d4/0x905 kernel/softirq.c:571
Freed by task 21:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3786 [inline]
__kmem_cache_free+0xaf/0x2d0 mm/slub.c:3799
skb_kfree_head net/core/skbuff.c:906 [inline]
skb_free_head+0x110/0x1b0 net/core/skbuff.c:918
skb_release_data+0x598/0x820 net/core/skbuff.c:948
skb_release_all net/core/skbuff.c:1014 [inline]
__kfree_skb+0x51/0x70 net/core/skbuff.c:1028
__dccp_rcv_established.constprop.0+0x147/0x3f0 net/dccp/input.c:360
dccp_rcv_established net/dccp/input.c:376 [inline]
dccp_rcv_established+0x116/0x160 net/dccp/input.c:364
dccp_v6_do_rcv+0xb75/0xe80 net/dccp/ipv6.c:620
sk_backlog_rcv include/net/sock.h:1113 [inline]
__sk_receive_skb+0x298/0xb60 net/core/sock.c:565
dccp_v6_rcv+0xe42/0x1320 net/dccp/ipv6.c:789
ip6_protocol_deliver_rcu+0x2e7/0x1250 net/ipv6/ip6_input.c:437
ip6_input_finish+0x150/0x2f0 net/ipv6/ip6_input.c:482
NF_HOOK include/linux/netfilter.h:303 [inline]
NF_HOOK include/linux/netfilter.h:297 [inline]
ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:491
dst_input include/net/dst.h:468 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:303 [inline]
NF_HOOK include/linux/netfilter.h:297 [inline]
ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5491
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5605
process_backlog+0x101/0x670 net/core/dev.c:5933
__napi_poll+0xb7/0x6f0 net/core/dev.c:6496
napi_poll net/core/dev.c:6563 [inline]
net_rx_action+0x8a9/0xcb0 net/core/dev.c:6696
__do_softirq+0x1d4/0x905 kernel/softirq.c:571
Last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491
__call_rcu_common.constprop.0+0x99/0x7e0 kernel/rcu/tree.c:2627
netlink_release+0xcde/0x1e40 net/netlink/af_netlink.c:828
__sock_release+0xcd/0x290 net/socket.c:653
sock_close+0x1c/0x20 net/socket.c:1397
__fput+0x27c/0xa90 fs/file_table.c:321
task_work_run+0x16f/0x270 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff888015b38000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1195 bytes inside of
freed 2048-byte region [ffff888015b38000, ffff888015b38800)
The buggy address belongs to the physical page:
page:ffffea000056ce00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15b38
head:ffffea000056ce00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000010200 ffff888012442000 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 30553, tgid 30552 (syz-executor.2), ts 840951024724, free_ts 840949936879
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731
prep_new_page mm/page_alloc.c:1738 [inline]
get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502
__alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x390 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3192
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291
__slab_alloc_node mm/slub.c:3344 [inline]
slab_alloc_node mm/slub.c:3441 [inline]
__kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3490
__do_kmalloc_node mm/slab_common.c:965 [inline]
__kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:986
kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:585
__alloc_skb+0x129/0x330 net/core/skbuff.c:654
alloc_skb include/linux/skbuff.h:1288 [inline]
alloc_skb_with_frags+0x9a/0x6c0 net/core/skbuff.c:6378
sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2729
sock_alloc_send_skb include/net/sock.h:1860 [inline]
dccp_sendmsg+0x2b4/0xbf0 net/dccp/proto.c:757
inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825
sock_sendmsg_nosec net/socket.c:724 [inline]
sock_sendmsg+0xde/0x190 net/socket.c:747
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1302 [inline]
free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564
free_unref_page+0x33/0x370 mm/page_alloc.c:2659
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:711 [inline]
slab_alloc_node mm/slub.c:3451 [inline]
kmem_cache_alloc_node+0x185/0x3e0 mm/slub.c:3496
__alloc_skb+0x288/0x330 net/core/skbuff.c:644
alloc_skb include/linux/skbuff.h:1288 [inline]
alloc_skb_with_frags+0x9a/0x6c0 net/core/skbuff.c:6378
sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2729
sock_alloc_send_skb include/net/sock.h:1860 [inline]
dccp_sendmsg+0x2b4/0xbf0 net/dccp/proto.c:757
inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825
sock_sendmsg_nosec net/socket.c:724 [inline]
sock_sendmsg+0xde/0x190 net/socket.c:747
____sys_sendmsg+0x334/0x900 net/socket.c:2503
___sys_sendmsg+0x110/0x1b0 net/socket.c:2557
__sys_sendmmsg+0x18f/0x460 net/socket.c:2643
__do_sys_sendmmsg net/socket.c:2672 [inline]
__se_sys_sendmmsg net/socket.c:2669 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2669
Memory state around the buggy address:
ffff888015b38380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888015b38400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888015b38480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888015b38500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888015b38580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================