RBP: 00007f3e4740a1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdecd135df R14: 00007f3e4740a300 R15: 0000000000022000 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: __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 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 ==================================================================