================================================================== BUG: KASAN: slab-out-of-bounds in ip6_tnl_xmit2+0x1f95/0x2320 net/ipv6/ip6_tunnel.c:987 Read of size 16 at addr ffff8801bac44730 by task syz-executor.2/2106 CPU: 1 PID: 2106 Comm: syz-executor.2 Not tainted 4.4.174+ #17 0000000000000000 709ac852c12bc654 ffff8801db707180 ffffffff81aad1a1 0000000000000000 ffffea0006eb1100 ffff8801bac44730 0000000000000010 ffff8801bac44480 ffff8801db7071b8 ffffffff81490120 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] print_address_description+0x6f/0x21b mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report mm/kasan/report.c:408 [inline] [] kasan_report.cold+0x8c/0x2be mm/kasan/report.c:393 [] __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:439 [] ip6_tnl_xmit2+0x1f95/0x2320 net/ipv6/ip6_tunnel.c:987 [] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline] [] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212 [] __netdev_start_xmit include/linux/netdevice.h:3750 [inline] [] netdev_start_xmit include/linux/netdevice.h:3759 [inline] [] xmit_one net/core/dev.c:2781 [inline] [] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797 [] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229 [] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263 [] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369 [] dst_neigh_output include/net/dst.h:461 [inline] [] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213 [] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288 [] NF_HOOK_COND include/linux/netfilter.h:240 [inline] [] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362 [] dst_output include/net/dst.h:498 [inline] [] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119 [] ip_queue_xmit+0x89c/0x1ab0 net/ipv4/ip_output.c:461 [] __tcp_transmit_skb+0x1904/0x2cf0 net/ipv4/tcp_output.c:1034 [] tcp_transmit_skb net/ipv4/tcp_output.c:1047 [inline] [] __tcp_retransmit_skb+0x5ea/0x1710 net/ipv4/tcp_output.c:2665 [] tcp_retransmit_skb+0x23/0x2c0 net/ipv4/tcp_output.c:2682 [] tcp_retransmit_timer net/ipv4/tcp_timer.c:461 [inline] [] tcp_retransmit_timer+0x7ee/0x1f70 net/ipv4/tcp_timer.c:379 [] tcp_write_timer_handler+0x3bc/0x700 net/ipv4/tcp_timer.c:543 [] tcp_write_timer+0xbd/0xd0 net/ipv4/tcp_timer.c:561 [] call_timer_fn+0x18d/0x850 kernel/time/timer.c:1185 [] __run_timers kernel/time/timer.c:1261 [inline] [] run_timer_softirq+0x51f/0xb70 kernel/time/timer.c:1444 [] __do_softirq+0x226/0xa3f kernel/softirq.c:273 [] invoke_softirq kernel/softirq.c:350 [inline] [] irq_exit+0x10a/0x150 kernel/softirq.c:391 [] exiting_irq arch/x86/include/asm/apic.h:652 [inline] [] smp_apic_timer_interrupt+0x7e/0xb0 arch/x86/kernel/apic/apic.c:926 [] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:768 [] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:812 [inline] [] ? lock_acquire+0x19f/0x450 kernel/locking/lockdep.c:3595 [] rcu_lock_acquire include/linux/rcupdate.h:477 [inline] [] rcu_read_lock include/linux/rcupdate.h:861 [inline] [] avc_has_perm_noaudit security/selinux/avc.c:1108 [inline] [] avc_has_perm+0xe6/0x3a0 security/selinux/avc.c:1146 [] task_has_perm+0x200/0x330 security/selinux/hooks.c:1525 [] selinux_task_wait+0x24/0x30 security/selinux/hooks.c:3763 [] security_task_wait+0x73/0xb0 security/security.c:993 [] wait_consider_task+0x28b/0x35b0 kernel/exit.c:1334 [] do_wait_thread kernel/exit.c:1447 [inline] [] do_wait+0x350/0xa00 kernel/exit.c:1518 [] SYSC_wait4 kernel/exit.c:1649 [inline] [] SyS_wait4+0x144/0x210 kernel/exit.c:1614 [] C_SYSC_wait4 kernel/compat.c:543 [inline] [] compat_SyS_wait4+0x259/0x2a0 kernel/compat.c:536 [] sys32_waitpid+0x28/0x30 arch/x86/ia32/sys_ia32.c:172 [] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] [] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397 [] sysenter_flags_fixed+0xd/0x1a Allocated by task 2106: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack mm/kasan/kasan.c:512 [inline] [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616 [] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601 [] __kmalloc+0x141/0x330 mm/slub.c:3613 [] kmalloc include/linux/slab.h:481 [inline] [] kzalloc include/linux/slab.h:620 [inline] [] neigh_alloc net/core/neighbour.c:285 [inline] [] __neigh_create+0x1d6/0x1b30 net/core/neighbour.c:457 [] neigh_create include/net/neighbour.h:313 [inline] [] ipv4_neigh_lookup+0x52e/0x6e0 net/ipv4/route.c:464 [] dst_neigh_lookup include/net/dst.h:466 [inline] [] ip6_tnl_xmit2+0x27b/0x2320 net/ipv6/ip6_tunnel.c:982 [] ip4ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1134 [inline] [] ip6_tnl_xmit+0xa09/0xe00 net/ipv6/ip6_tunnel.c:1212 [] __netdev_start_xmit include/linux/netdevice.h:3750 [inline] [] netdev_start_xmit include/linux/netdevice.h:3759 [inline] [] xmit_one net/core/dev.c:2781 [inline] [] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797 [] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229 [] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263 [] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369 [] dst_neigh_output include/net/dst.h:461 [inline] [] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:213 [] ip_finish_output+0x8b2/0xc60 net/ipv4/ip_output.c:288 [] NF_HOOK_COND include/linux/netfilter.h:240 [inline] [] ip_output+0x227/0x4c0 net/ipv4/ip_output.c:362 [] dst_output include/net/dst.h:498 [inline] [] ip_local_out+0x9c/0x180 net/ipv4/ip_output.c:119 [] ip_queue_xmit+0x89c/0x1ab0 net/ipv4/ip_output.c:461 [] __tcp_transmit_skb+0x1904/0x2cf0 net/ipv4/tcp_output.c:1034 [] tcp_transmit_skb net/ipv4/tcp_output.c:1047 [inline] [] __tcp_retransmit_skb+0x5ea/0x1710 net/ipv4/tcp_output.c:2665 [] tcp_retransmit_skb+0x23/0x2c0 net/ipv4/tcp_output.c:2682 [] tcp_retransmit_timer net/ipv4/tcp_timer.c:461 [inline] [] tcp_retransmit_timer+0x7ee/0x1f70 net/ipv4/tcp_timer.c:379 [] tcp_write_timer_handler+0x3bc/0x700 net/ipv4/tcp_timer.c:543 [] tcp_write_timer+0xbd/0xd0 net/ipv4/tcp_timer.c:561 [] call_timer_fn+0x18d/0x850 kernel/time/timer.c:1185 [] __run_timers kernel/time/timer.c:1261 [inline] [] run_timer_softirq+0x51f/0xb70 kernel/time/timer.c:1444 [] __do_softirq+0x226/0xa3f kernel/softirq.c:273 Freed by task 18265: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack mm/kasan/kasan.c:512 [inline] [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:589 [] slab_free_hook mm/slub.c:1383 [inline] [] slab_free_freelist_hook mm/slub.c:1405 [inline] [] slab_free mm/slub.c:2859 [inline] [] kfree+0xf4/0x310 mm/slub.c:3749 [] skb_free_head net/core/skbuff.c:571 [inline] [] skb_release_data+0x2e6/0x380 net/core/skbuff.c:602 [] skb_release_all+0x4d/0x60 net/core/skbuff.c:661 [] __kfree_skb net/core/skbuff.c:675 [inline] [] kfree_skb+0xf7/0x400 net/core/skbuff.c:696 [] ip6_tnl_xmit+0x672/0xe00 net/ipv6/ip6_tunnel.c:1229 [] __netdev_start_xmit include/linux/netdevice.h:3750 [inline] [] netdev_start_xmit include/linux/netdevice.h:3759 [inline] [] xmit_one net/core/dev.c:2781 [inline] [] dev_hard_start_xmit+0x7c1/0x11e0 net/core/dev.c:2797 [] __dev_queue_xmit+0x164b/0x1bb0 net/core/dev.c:3229 [] dev_queue_xmit+0x18/0x20 net/core/dev.c:3263 [] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1369 [] dst_neigh_output include/net/dst.h:461 [inline] [] ip6_finish_output2+0x9c7/0x1dc0 net/ipv6/ip6_output.c:113 [] ip6_finish_output+0x2f3/0x750 net/ipv6/ip6_output.c:131 [] NF_HOOK_COND include/linux/netfilter.h:240 [inline] [] ip6_output+0x1b4/0x520 net/ipv6/ip6_output.c:145 [] dst_output include/net/dst.h:498 [inline] [] ip6_local_out+0x9c/0x180 net/ipv6/output_core.c:169 [] ip6_send_skb+0xa2/0x340 net/ipv6/ip6_output.c:1725 [] udp_v6_send_skb+0x438/0xe90 net/ipv6/udp.c:1066 [] udpv6_sendmsg+0x1e3d/0x24f0 net/ipv6/udp.c:1330 [] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755 [] sock_sendmsg_nosec net/socket.c:638 [inline] [] sock_sendmsg+0xbe/0x110 net/socket.c:648 [] ___sys_sendmsg+0x369/0x890 net/socket.c:1975 [] __sys_sendmmsg+0x1d6/0x2e0 net/socket.c:2053 [] C_SYSC_sendmmsg net/compat.c:731 [inline] [] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:728 [] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] [] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397 [] sysenter_flags_fixed+0xd/0x1a The buggy address belongs to the object at ffff8801bac44480 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 688 bytes inside of 1024-byte region [ffff8801bac44480, ffff8801bac44880) The buggy address belongs to the page: Initializing cgroup subsys cpu Initializing cgroup subsys cpuacct Linux version 4.4.174+ (syzkaller@ci) (gcc version 9.0.0 20181231 (experimental) (GCC) ) #17 SMP PREEMPT Fri Feb 8 11:11:08 UTC 2019 Command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0 earlyprintk=serial vsyscall=native rodata=n oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 workqueue.watchdog_thresh=140 nopti KERNEL supported cpus: Intel GenuineIntel AMD AuthenticAMD x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256 x86/fpu: Supporting XSAVE feature 0x01: 'x87 floating point registers' x86/fpu: Supporting XSAVE feature 0x02: 'SSE registers' x86/fpu: Supporting XSAVE feature 0x04: 'AVX registers' x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format. e820: BIOS-provided physical RAM map: BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved BIOS-e820: [mem 0x0000000000100000-0x00000000bfffcfff] usable BIOS-e820: [mem 0x00000000bfffd000-0x00000000bfffffff] reserved BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] reserved BIOS-e820: [mem 0x0000000100000000-0x000000021fffffff] usable bootconsole [earlyser0] enabled NX (Execute Disable) protection: active Hypervisor detected: KVM Kernel/User page tables isolation: disabled e820: last_pfn = 0x220000 max_arch_pfn = 0x400000000 x86/PAT: Configuration [0-7]: WB WC UC- UC UC UC UC UC e820: last_pfn = 0xbfffd max_arch_pfn = 0x400000000 found SMP MP-table at [mem 0x000f2470-0x000f247f] mapped at [ffff8800000f2470] Using GB pages for direct mapping ACPI: Early table checksum verification disabled ACPI: RSDP 0x00000000000F21F0 000014 (v00 Google) ACPI: RSDT 0x00000000BFFFFFC0 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001) ACPI: FACP 0x00000000BFFFF380 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001) ACPI: DSDT 0x00000000BFFFDAC0 0018BA (v01 Google GOOGDSDT 00000001 GOOG 00000001) ACPI: FACS 0x00000000BFFFDA80 000040 ACPI: FACS 0x00000000BFFFDA80 000040 ACPI: SRAT 0x00000000BFFFFEB0 0000C8 (v01 Google GOOGSRAT 00000001 GOOG 00000001) ACPI: APIC 0x00000000BFFFFE00 000076 (v01 Google GOOGAPIC 00000001 GOOG 00000001) ACPI: SSDT 0x00000000BFFFF480 000980 (v01 Google GOOGSSDT 00000001 GOOG 00000001) ACPI: WAET 0x00000000BFFFFE80 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001) kvm-clock: Using msrs 4b564d01 and 4b564d00 kvm-clock: cpu 0, msr 2:1fffd001, primary cpu clock kvm-clock: using sched offset of 2626216979 cycles clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns Zone ranges: DMA32 [mem 0x0000000000001000-0x00000000ffffffff] Normal [mem 0x0000000100000000-0x000000021fffffff] Movable zone start for each node Early memory node ranges node 0: [mem 0x0000000000001000-0x000000000009efff] node 0: [mem 0x0000000000100000-0x00000000bfffcfff] node 0: [mem 0x0000000100000000-0x000000021fffffff] Initmem setup node 0 [mem 0x0000000000001000-0x000000021fffffff] kasan: KernelAddressSanitizer initialized ACPI: PM-Timer IO Port: 0xb008 ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1]) IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23 ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level) ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level) Using ACPI (MADT) for SMP configuration information smpboot: Allowing 2 CPUs, 0 hotplug CPUs e820: [mem 0xc0000000-0xfffbbfff] available for PCI devices Booting paravirtualized kernel on KVM clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:2 nr_node_ids:1 PERCPU: Embedded 41 pages/cpu @ffff8801db600000 s130696 r8192 d29048 u1048576 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 1935238 Kernel command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0 earlyprintk=serial vsyscall=native rodata=n oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 workqueue.watchdog_thresh=140 nopti PID hash table entries: 4096 (order: 3, 32768 bytes) Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes) Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes) Memory: 6609392K/7863916K available (23671K kernel code, 3786K rwdata, 5144K rodata, 1320K init, 23156K bss, 1254524K reserved, 0K cma-reserved) SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 Running RCU self tests Preemptible hierarchical RCU implementation. RCU lockdep checking is enabled. Build-time adjustment of leaf fanout to 64. RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2. RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=2 NR_IRQS:4352 nr_irqs:440 16 console [ttyS0] enabled console [ttyS0] enabled bootconsole [earlyser0] disabled bootconsole [earlyser0] disabled Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar ... MAX_LOCKDEP_SUBCLASSES: 8 ... MAX_LOCK_DEPTH: 48 ... MAX_LOCKDEP_KEYS: 8191 ... CLASSHASH_SIZE: 4096 ... MAX_LOCKDEP_ENTRIES: 32768 ... MAX_LOCKDEP_CHAINS: 65536 ... CHAINHASH_SIZE: 32768 memory used by lock dependency info: 8159 kB per task-struct memory footprint: 1920 bytes tsc: Detected 2300.000 MHz processor Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) pid_max: default: 32768 minimum: 301 ACPI: Core revision 20150930 ACPI: 2 ACPI AML tables successfully acquired and loaded Security Framework initialized SELinux: Initializing. Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) Initializing cgroup subsys freezer CPU: Physical Processor ID: 0 Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 Spectre V2 : Mitigation: Full generic retpoline Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch Spectre V2 : Spectre v2 mitigation: Enabling Indirect Branch Prediction Barrier Spectre V2 : Enabling Restricted Speculation for firmware calls Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl and seccomp Freeing SMP alternatives memory: 28K ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. KVM setup paravirtual spinlock x86: Booting SMP configuration: .... node #0, CPUs: #1 kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock x86: Booted up 1 node, 2 CPUs smpboot: Total of 2 processors activated (9200.00 BogoMIPS) CPU1: update max cpu_capacity 1024 devtmpfs: initialized CPU1: update max cpu_capacity 1024 clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns futex hash table entries: 512 (order: 4, 65536 bytes) NET: Registered protocol family 16 cpuidle: using governor ladder cpuidle: using governor menu ACPI: bus type PCI registered PCI: Using configuration type 1 for base access ACPI: Added _OSI(Module Device) ACPI: Added _OSI(Processor Device) ACPI: Added _OSI(3.0 _SCP Extensions) ACPI: Added _OSI(Processor Aggregator Device) ACPI: Executed 2 blocks of module-level executable AML code ACPI: Interpreter enabled ACPI: (supports S0 S3 S5) ACPI: Using IOAPIC for interrupt routing PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) acpi PNP0A03:00: _OSC: OS supports [Segments MSI] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM PCI host bridge to bus 0000:00 pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] pci_bus 0000:00: root bus resource [bus 00-ff] pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11) ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11) ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11) ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11) ACPI: PCI Interrupt Link [LNKS] (IRQs *9) ACPI: Enabled 16 GPEs in block 00 to 0F vgaarb: loaded SCSI subsystem initialized ACPI: bus type USB registered usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb Advanced Linux Sound Architecture Driver Initialized. PCI: Using ACPI for IRQ routing amd_nb: Cannot enumerate AMD northbridges clocksource: Switched to clocksource kvm-clock pnp: PnP ACPI init