================================================================== BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188 Read of size 8 at addr ffff888061a8b640 by task syz-executor.4/7565 CPU: 0 PID: 7565 Comm: syz-executor.4 Not tainted 5.1.0-rc1+ #34 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 ccid_hc_tx_delete+0xde/0x100 net/dccp/ccid.c:188 dccp_sk_destruct+0x3f/0x90 net/dccp/proto.c:181 __sk_destruct+0x55/0x6d0 net/core/sock.c:1699 __rcu_reclaim kernel/rcu/rcu.h:227 [inline] rcu_do_batch kernel/rcu/tree.c:2475 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline] rcu_core+0x928/0x1390 kernel/rcu/tree.c:2769 __do_softirq+0x266/0x95a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:console_unlock+0xb5c/0xeb0 kernel/printk/printk.c:2460 Code: 92 88 48 c1 e8 03 42 80 3c 30 00 0f 85 c9 02 00 00 48 83 3d e5 14 38 07 00 0f 84 98 01 00 00 e8 ba ed 15 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 6b ff ff ff e8 a5 ed 15 00 48 8b 7d 08 c7 05 27 RSP: 0018:ffff88806549ee88 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff888065496640 RBX: 0000000000000200 RCX: 1ffff1100ca92de1 RDX: 0000000000000000 RSI: ffffffff815a81d6 RDI: 0000000000000293 RBP: ffff88806549ef10 R08: ffff888065496640 R09: ffff888065496f08 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff842092c0 R14: dffffc0000000000 R15: ffffffff88f90410 vprintk_emit+0x280/0x6d0 kernel/printk/printk.c:1975 vprintk_default+0x28/0x30 kernel/printk/printk.c:2002 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2035 __dev_set_promiscuity.cold+0x48/0x345 net/core/dev.c:7358 dev_set_promiscuity+0x57/0xe0 net/core/dev.c:7397 hsr_portdev_setup net/hsr/hsr_slave.c:109 [inline] hsr_add_port+0x2bb/0x620 net/hsr/hsr_slave.c:154 hsr_dev_finalize+0x5a8/0x77f net/hsr/hsr_device.c:493 hsr_newlink+0x26b/0x320 net/hsr/hsr_netlink.c:72 __rtnl_newlink+0x107b/0x16c0 net/core/rtnetlink.c:3176 rtnl_newlink+0x69/0xa0 net/core/rtnetlink.c:3234 rtnetlink_rcv_msg+0x465/0xb00 net/core/rtnetlink.c:5192 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2485 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5210 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1809 __do_compat_sys_socketcall net/compat.c:826 [inline] __se_compat_sys_socketcall net/compat.c:774 [inline] __ia32_compat_sys_socketcall+0x536/0x720 net/compat.c:774 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f3e869 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:000000000845fc10 EFLAGS: 00000206 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 000000000845fc28 RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000003 RBP: 000000000845ff2c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7598: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505 slab_post_alloc_hook mm/slab.h:436 [inline] slab_alloc mm/slab.c:3392 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3554 ccid_new+0x256/0x3f0 net/dccp/ccid.c:151 dccp_hdlr_ccid+0x27/0x150 net/dccp/feat.c:44 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538 dccp_rcv_request_sent_state_process net/dccp/input.c:472 [inline] dccp_rcv_state_process+0x116f/0x1935 net/dccp/input.c:680 dccp_v6_do_rcv+0x269/0xbf0 net/dccp/ipv6.c:641 sk_backlog_rcv include/net/sock.h:937 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2413 release_sock+0x59/0x1c0 net/core/sock.c:2929 inet_wait_for_connect net/ipv4/af_inet.c:588 [inline] __inet_stream_connect+0x59f/0xea0 net/ipv4/af_inet.c:680 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x266/0x330 net/socket.c:1685 __do_sys_connect net/socket.c:1696 [inline] __se_sys_connect net/socket.c:1693 [inline] __ia32_sys_connect+0x72/0xb0 net/socket.c:1693 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 7602: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3764 ccid_hc_tx_delete+0xc1/0x100 net/dccp/ccid.c:190 dccp_hdlr_ccid+0x7d/0x150 net/dccp/feat.c:53 __dccp_feat_activate+0x17a/0x270 net/dccp/feat.c:344 dccp_feat_activate_values+0x33a/0x766 net/dccp/feat.c:1538 dccp_create_openreq_child+0x40c/0x570 net/dccp/minisocks.c:127 dccp_v6_request_recv_sock+0x214/0x1da0 net/dccp/ipv6.c:469 dccp_check_req+0x35c/0x6f0 net/dccp/minisocks.c:196 dccp_v6_rcv+0x6d7/0x191e net/dccp/ipv6.c:747 ip6_protocol_deliver_rcu+0x303/0x16c0 net/ipv6/ip6_input.c:394 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:443 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083 process_backlog+0x206/0x750 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x4fa/0x1070 net/core/dev.c:6412 __do_softirq+0x266/0x95a kernel/softirq.c:293 The buggy address belongs to the object at ffff888061a8b640 which belongs to the cache ccid2_hc_tx_sock of size 1240 The buggy address is located 0 bytes inside of 1240-byte region [ffff888061a8b640, ffff888061a8bb18) The buggy address belongs to the page: page:ffffea000186a280 count:1 mapcount:0 mapping:ffff8882165a2a80 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffff88809ac6c448 ffff88809ac6c448 ffff8882165a2a80 raw: 0000000000000000 ffff888061a8a040 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888061a8b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888061a8b580: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888061a8b600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff888061a8b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888061a8b700: 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