================================================================== BUG: KASAN: double-free or invalid-free in tcp_cdg_release+0x37/0x50 net/ipv4/tcp_cdg.c:390 CPU: 0 PID: 11504 Comm: syz-executor.2 Not tainted 5.5.0-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 kasan_report_invalid_free+0x65/0xa0 mm/kasan/report.c:468 __kasan_slab_free+0x13a/0x150 mm/kasan/common.c:453 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 tcp_cdg_release+0x37/0x50 net/ipv4/tcp_cdg.c:390 tcp_cleanup_congestion_control+0x71/0x130 net/ipv4/tcp_cong.c:210 tcp_v4_destroy_sock+0xf0/0x8b0 net/ipv4/tcp_ipv4.c:2157 tcp_v6_destroy_sock+0x16/0x30 net/ipv6/tcp_ipv6.c:1881 inet_csk_destroy_sock+0x1a7/0x4c0 net/ipv4/inet_connection_sock.c:844 tcp_done+0x288/0x3a0 net/ipv4/tcp.c:3869 tcp_v6_syn_recv_sock+0x1e21/0x24a0 net/ipv6/tcp_ipv6.c:1348 tcp_check_req+0x688/0x17b0 net/ipv4/tcp_minisocks.c:770 tcp_v6_rcv+0x21e8/0x3690 net/ipv6/tcp_ipv6.c:1612 ip6_protocol_deliver_rcu+0x2fe/0x1670 net/ipv6/ip6_input.c:432 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:473 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:482 dst_input include/net/dst.h:442 [inline] ip6_rcv_finish+0x1de/0x310 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:306 __netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:5198 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5312 process_backlog+0x206/0x750 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x508/0x1120 net/core/dev.c:6650 __do_softirq+0x262/0x98c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip6_finish_output2+0x1101/0x25c0 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x25e/0x880 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0xe1a/0x2090 net/ipv6/ip6_output.c:279 inet6_csk_xmit+0x339/0x610 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x1ac9/0x3900 net/ipv4/tcp_output.c:1234 tcp_transmit_skb net/ipv4/tcp_output.c:1250 [inline] tcp_write_xmit+0xf91/0x5bf0 net/ipv4/tcp_output.c:2513 __tcp_push_pending_frames+0xb4/0x350 net/ipv4/tcp_output.c:2689 tcp_send_fin+0x12a/0xd70 net/ipv4/tcp_output.c:3235 tcp_close+0xc25/0x1290 net/ipv4/tcp.c:2425 inet_release+0xed/0x200 net/ipv4/af_inet.c:427 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470 __sock_release+0xce/0x280 net/socket.c:605 sock_close+0x1e/0x30 net/socket.c:1283 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 get_signal+0x206e/0x24f0 kernel/signal.c:2528 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1d270fac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: fffffffffffffe00 RBX: 00007f1d270fb6d4 RCX: 000000000045b349 RDX: fffffffffffffe3c RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000020001880 R09: 000000000000017c R10: 0000000000000100 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000883 R14: 00000000004c9e71 R15: 000000000075bf2c Allocated by task 11508: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc_array include/linux/slab.h:598 [inline] kcalloc include/linux/slab.h:609 [inline] tcp_cdg_init+0x11f/0x180 net/ipv4/tcp_cdg.c:380 tcp_init_congestion_control+0xac/0x450 net/ipv4/tcp_cong.c:183 tcp_reinit_congestion_control+0xd1/0x100 net/ipv4/tcp_cong.c:201 tcp_set_congestion_control+0x568/0x602 net/ipv4/tcp_cong.c:384 do_tcp_setsockopt.isra.0+0x46d/0x2500 net/ipv4/tcp.c:2814 tcp_setsockopt+0xbe/0xe0 net/ipv4/tcp.c:3161 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3149 __sys_setsockopt+0x261/0x4c0 net/socket.c:2130 __do_sys_setsockopt net/socket.c:2146 [inline] __se_sys_setsockopt net/socket.c:2143 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2143 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11508: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 tcp_cdg_release+0x37/0x50 net/ipv4/tcp_cdg.c:390 tcp_cleanup_congestion_control+0x71/0x130 net/ipv4/tcp_cong.c:210 tcp_v4_destroy_sock+0xf0/0x8b0 net/ipv4/tcp_ipv4.c:2157 tcp_v6_destroy_sock+0x16/0x30 net/ipv6/tcp_ipv6.c:1881 inet_csk_destroy_sock+0x1a7/0x4c0 net/ipv4/inet_connection_sock.c:844 tcp_close+0xdf9/0x1290 net/ipv4/tcp.c:2503 inet_release+0xed/0x200 net/ipv4/af_inet.c:427 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470 __sock_release+0xce/0x280 net/socket.c:605 sock_close+0x1e/0x30 net/socket.c:1283 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 get_signal+0x206e/0x24f0 kernel/signal.c:2528 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808c76cf80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff88808c76cf80, ffff88808c76cfc0) The buggy address belongs to the page: page:ffffea000231db00 refcount:1 mapcount:0 mapping:ffff8880aa400380 index:0x0 raw: 00fffe0000000200 ffffea00023c0e48 ffffea000258d888 ffff8880aa400380 raw: 0000000000000000 ffff88808c76c000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808c76ce80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88808c76cf00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88808c76cf80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88808c76d000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808c76d080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================