RBP: 00007f3e4740a1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdecd135df R14: 00007f3e4740a300 R15: 0000000000022000
 </TASK>
dccp_parse_options: DCCP(ffff88801f5135c0): Option 32 (len=7) error=9
==================================================================
BUG: KASAN: use-after-free in dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline]
BUG: KASAN: use-after-free in ccid2_hc_tx_packet_recv+0x22aa/0x2610 net/dccp/ccids/ccid2.c:592
Read of size 1 at addr ffff88804aa8e4a2 by task syz-executor.4/18730

CPU: 0 PID: 18730 Comm: syz-executor.4 Not tainted 6.1.0-syzkaller-07445-g7e68dd7d07a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495
 dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline]
 ccid2_hc_tx_packet_recv+0x22aa/0x2610 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+0xa17/0xc60 net/dccp/ipv6.c:621
 sk_backlog_rcv include/net/sock.h:1109 [inline]
 __release_sock+0x133/0x3b0 net/core/sock.c:2928
 release_sock+0x58/0x1b0 net/core/sock.c:3484
 dccp_sendmsg+0x6d0/0xd30 net/dccp/proto.c:790
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xd3/0x120 net/socket.c:734
 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
 __sys_sendmmsg+0x18f/0x460 net/socket.c:2616
 __do_sys_sendmmsg net/socket.c:2645 [inline]
 __se_sys_sendmmsg net/socket.c:2642 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3e4668c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3e4740a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f3e467abf80 RCX: 00007f3e4668c0d9
RDX: 0000000000000500 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007f3e4740a1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdecd135df R14: 00007f3e4740a300 R15: 0000000000022000
 </TASK>

Allocated by task 18730:
 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:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:968 [inline]
 __kmalloc_node_track_caller+0x5b/0xc0 mm/slab_common.c:988
 kmalloc_reserve net/core/skbuff.c:492 [inline]
 __alloc_skb+0xe9/0x310 net/core/skbuff.c:565
 alloc_skb include/linux/skbuff.h:1270 [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+0xa17/0xc60 net/dccp/ipv6.c:621
 sk_backlog_rcv include/net/sock.h:1109 [inline]
 __sk_receive_skb+0x298/0x820 net/core/sock.c:565
 dccp_v6_rcv+0xd4e/0x11f0 net/dccp/ipv6.c:790
 ip6_protocol_deliver_rcu+0x2dd/0x1280 net/ipv6/ip6_input.c:439
 ip6_input_finish+0x150/0x2c0 net/ipv6/ip6_input.c:484
 NF_HOOK include/linux/netfilter.h:302 [inline]
 NF_HOOK include/linux/netfilter.h:296 [inline]
 ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:493
 dst_input include/net/dst.h:454 [inline]
 ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 NF_HOOK include/linux/netfilter.h:296 [inline]
 ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5482
 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5596
 process_backlog+0x3e4/0x810 net/core/dev.c:5924
 __napi_poll+0xb8/0x770 net/core/dev.c:6485
 napi_poll net/core/dev.c:6552 [inline]
 net_rx_action+0xa00/0xde0 net/core/dev.c:6663
 __do_softirq+0x1fb/0xadc kernel/softirq.c:571

Freed by task 18730:
 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:518
 ____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:177 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
 slab_free mm/slub.c:3787 [inline]
 __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800
 skb_free_head+0xac/0x110 net/core/skbuff.c:822
 skb_release_data+0x5f4/0x870 net/core/skbuff.c:851
 skb_release_all net/core/skbuff.c:916 [inline]
 __kfree_skb net/core/skbuff.c:930 [inline]
 kfree_skb_reason+0x1ab/0x4f0 net/core/skbuff.c:956
 kfree_skb include/linux/skbuff.h:1218 [inline]
 dccp_v6_do_rcv+0x9a1/0xc60 net/dccp/ipv6.c:664
 sk_backlog_rcv include/net/sock.h:1109 [inline]
 __release_sock+0x133/0x3b0 net/core/sock.c:2928
 release_sock+0x58/0x1b0 net/core/sock.c:3484
 dccp_sendmsg+0x6d0/0xd30 net/dccp/proto.c:790
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xd3/0x120 net/socket.c:734
 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
 __sys_sendmmsg+0x18f/0x460 net/socket.c:2616
 __do_sys_sendmmsg net/socket.c:2645 [inline]
 __se_sys_sendmmsg net/socket.c:2642 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

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:488
 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753
 netlink_release+0xdcb/0x1e60 net/netlink/af_netlink.c:826
 __sock_release net/socket.c:650 [inline]
 sock_release+0x8b/0x1b0 net/socket.c:678
 netlink_kernel_release+0x4f/0x60 net/netlink/af_netlink.c:2118
 crypto_netlink_exit+0x38/0x80 crypto/crypto_user_base.c:492
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x669/0x1090 kernel/workqueue.c:2436
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Second to 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:488
 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753
 netlink_release+0xdcb/0x1e60 net/netlink/af_netlink.c:826
 __sock_release+0xcd/0x280 net/socket.c:650
 sock_close+0x1c/0x20 net/socket.c:1365
 __fput+0x27c/0xa90 fs/file_table.c:320
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xb3d/0x2a30 kernel/exit.c:820
 do_group_exit+0xd4/0x2a0 kernel/exit.c:950
 get_signal+0x21b1/0x2440 kernel/signal.c:2858
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
 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 ffff88804aa8e000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1186 bytes inside of
 2048-byte region [ffff88804aa8e000, ffff88804aa8e800)

The buggy address belongs to the physical page:
page:ffffea00012aa200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4aa88
head:ffffea00012aa200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012442000 ffffea0000773600 dead000000000002
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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5303, tgid 5303 (kworker/1:3), ts 139812177418, free_ts 13205535772
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291
 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491
 __do_kmalloc_node mm/slab_common.c:967 [inline]
 __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:988
 kmalloc_reserve net/core/skbuff.c:492 [inline]
 __alloc_skb+0xe9/0x310 net/core/skbuff.c:565
 alloc_skb include/linux/skbuff.h:1270 [inline]
 alloc_skb_with_frags+0x97/0x6c0 net/core/skbuff.c:6192
 sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2741
 sock_alloc_send_skb include/net/sock.h:1884 [inline]
 mld_newpack.isra.0+0x1b9/0x770 net/ipv6/mcast.c:1748
 add_grhead+0x295/0x340 net/ipv6/mcast.c:1851
 add_grec+0x1082/0x1560 net/ipv6/mcast.c:1989
 mld_send_cr net/ipv6/mcast.c:2115 [inline]
 mld_ifc_work+0x456/0xdc0 net/ipv6/mcast.c:2653
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483
 free_contig_range+0xb5/0x180 mm/page_alloc.c:9496
 destroy_args+0xa8/0x64c mm/debug_vm_pgtable.c:1031
 debug_vm_pgtable+0x2958/0x29e9 mm/debug_vm_pgtable.c:1354
 do_one_initcall+0x141/0x790 init/main.c:1306
 do_initcall_level init/main.c:1379 [inline]
 do_initcalls init/main.c:1395 [inline]
 do_basic_setup init/main.c:1414 [inline]
 kernel_init_freeable+0x6f9/0x782 init/main.c:1634
 kernel_init+0x1e/0x1d0 init/main.c:1522
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
 ffff88804aa8e380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804aa8e400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804aa8e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88804aa8e500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804aa8e580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================