RBP: 00007f159205d120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f1590f9bf80 R15: 00007ffdf446f0a8 dccp_parse_options: DCCP(ffff88802a561580): Option 32 (len=7) error=9 ================================================================== 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+0x1dae/0x2210 net/dccp/ccids/ccid2.c:592 Read of size 1 at addr ffff888023259494 by task syz-executor.0/5473 CPU: 0 PID: 5473 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller-04629-g3e7aeb78ab01 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 dccp_ackvec_runlen net/dccp/ccids/../ackvec.h:43 [inline] ccid2_hc_tx_packet_recv+0x1dae/0x2210 net/dccp/ccids/ccid2.c:592 ccid_hc_tx_packet_recv net/dccp/ccid.h:189 [inline] dccp_deliver_input_to_ccids+0x1ef/0x260 net/dccp/input.c:182 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x106/0x160 net/dccp/input.c:364 dccp_v4_do_rcv+0x169/0x1b0 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1092 [inline] __release_sock+0x132/0x3b0 net/core/sock.c:2972 release_sock+0x5a/0x1f0 net/core/sock.c:3538 dccp_sendmsg+0x40f/0xcc0 net/dccp/proto.c:803 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:847 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x2ac/0x940 net/socket.c:2584 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2724 __do_sys_sendmmsg net/socket.c:2753 [inline] __se_sys_sendmmsg net/socket.c:2750 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2750 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f1590e7ad39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f159205d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f1590f9bf80 RCX: 00007f1590e7ad39 RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005 RBP: 00007f159205d120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000000b R14: 00007f1590f9bf80 R15: 00007ffdf446f0a8 Allocated by task 5473: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc_node_track_caller+0x219/0x460 mm/slub.c:4001 kmalloc_reserve+0xef/0x260 net/core/skbuff.c:582 __alloc_skb+0x12b/0x330 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1296 [inline] dccp_send_ack.part.0+0x72/0x2e0 net/dccp/output.c:585 dccp_send_ack+0x58/0x70 net/dccp/output.c:584 ccid2_hc_rx_packet_recv+0x136/0x1b0 net/dccp/ccids/ccid2.c:771 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xe3/0x260 net/dccp/input.c:176 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x106/0x160 net/dccp/input.c:364 dccp_v4_do_rcv+0x169/0x1b0 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1092 [inline] __sk_receive_skb+0x2af/0x840 net/core/sock.c:567 dccp_v4_rcv+0x128a/0x1980 net/dccp/ipv4.c:898 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2e4/0x510 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x1b8/0x2e0 net/ipv4/ip_input.c:449 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0xaf/0xd0 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5534 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5648 process_backlog+0x101/0x6b0 net/core/dev.c:5976 __napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6576 napi_poll net/core/dev.c:6645 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6778 __do_softirq+0x21a/0x8de kernel/softirq.c:553 Freed by task 5473: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:634 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x121/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x360 mm/slub.c:4409 skb_kfree_head net/core/skbuff.c:986 [inline] skb_free_head+0x110/0x1b0 net/core/skbuff.c:998 skb_release_data+0x5ba/0x870 net/core/skbuff.c:1028 skb_release_all net/core/skbuff.c:1094 [inline] __kfree_skb net/core/skbuff.c:1108 [inline] kfree_skb_reason+0x12d/0x210 net/core/skbuff.c:1144 kfree_skb include/linux/skbuff.h:1244 [inline] dccp_v4_do_rcv+0x143/0x1b0 net/dccp/ipv4.c:710 sk_backlog_rcv include/net/sock.h:1092 [inline] __release_sock+0x132/0x3b0 net/core/sock.c:2972 release_sock+0x5a/0x1f0 net/core/sock.c:3538 dccp_sendmsg+0x40f/0xcc0 net/dccp/proto.c:803 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:847 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x2ac/0x940 net/socket.c:2584 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2724 __do_sys_sendmmsg net/socket.c:2753 [inline] __se_sys_sendmmsg net/socket.c:2750 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2750 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff888023259000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1172 bytes inside of freed 2048-byte region [ffff888023259000, ffff888023259800) The buggy address belongs to the physical page: page:ffffea00008c9600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23258 head:ffffea00008c9600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888013042000 0000000000000000 0000000000000001 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 1046, tgid 1046 (kworker/u4:6), ts 74171011383, free_ts 71952550523 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x35b/0x460 mm/slub.c:4001 kmalloc_reserve+0xef/0x260 net/core/skbuff.c:582 __alloc_skb+0x12b/0x330 net/core/skbuff.c:651 alloc_skb include/linux/skbuff.h:1296 [inline] nlmsg_new include/net/netlink.h:1010 [inline] rtmsg_ifinfo_build_skb+0x82/0x280 net/core/rtnetlink.c:4069 unregister_netdevice_many_notify+0x95f/0x1a10 net/core/dev.c:11087 ip6_tnl_exit_batch_net+0x5c6/0x740 net/ipv6/ip6_tunnel.c:2278 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175 cleanup_net+0x505/0xb20 net/core/net_namespace.c:618 process_one_work+0x886/0x15d0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2787 page last free pid 5054 tgid 5050 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x51f/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 vfree+0x181/0x7a0 mm/vmalloc.c:2842 kcov_put kernel/kcov.c:429 [inline] kcov_put+0x26/0x40 kernel/kcov.c:425 do_exit+0x1db/0x2ad0 kernel/exit.c:822 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020 get_signal+0x23b5/0x2790 kernel/signal.c:2893 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff888023259380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023259400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888023259480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888023259500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023259580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================