binder_alloc: 7134: binder_alloc_buf, no vma
binder: 7134:7156 transaction failed 29189/-3, size 0-8 line 3128
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29201
==================================================================
BUG: KASAN: use-after-free in pppol2tp_session_destruct+0xee/0x110 net/l2tp/l2tp_ppp.c:476
Read of size 4 at addr ffff8800b74a8000 by task syz-executor1/7147

CPU: 0 PID: 7147 Comm: syz-executor1 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 de5d4b1ec7fa660e ffff8801c3387c20 ffffffff81d0408d
 ffffea0002dd2a00 ffff8800b74a8000 0000000000000000 ffff8800b74a8000
 ffffffff82de7d30 ffff8801c3387c58 ffffffff814fe143 ffff8800b74a8000
Call Trace:
 [<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fe143>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fe655>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fe655>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fe794>] __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:428
 [<ffffffff834651fe>] pppol2tp_session_destruct+0xee/0x110 net/l2tp/l2tp_ppp.c:476
 [<ffffffff82dfcc3a>] sk_destruct+0x4a/0x4c0 net/core/sock.c:1447
 [<ffffffff82dfd107>] __sk_free+0x57/0x230 net/core/sock.c:1480
 [<ffffffff82dfd310>] sk_free+0x30/0x40 net/core/sock.c:1491
 [<ffffffff834660ba>] sock_put include/net/sock.h:1639 [inline]
 [<ffffffff834660ba>] pppol2tp_release+0x27a/0x310 net/l2tp/l2tp_ppp.c:518
 [<ffffffff82de7bdd>] sock_release+0x8d/0x1e0 net/socket.c:586
 [<ffffffff82de7d46>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff81523603>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81523b25>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118b984>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff8100361d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100361d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252
 [<ffffffff81007084>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
 [<ffffffff81007084>] syscall_return_slowpath arch/x86/entry/common.c:348 [inline]
 [<ffffffff81007084>] do_syscall_32_irqs_on arch/x86/entry/common.c:398 [inline]
 [<ffffffff81007084>] do_fast_syscall_32+0x614/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17

Allocated by task 7147:
 [<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd47d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd47d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f9764>] __kmalloc+0x124/0x320 mm/slub.c:3613
 [<ffffffff8345eeb9>] kmalloc include/linux/slab.h:481 [inline]
 [<ffffffff8345eeb9>] kzalloc include/linux/slab.h:620 [inline]
 [<ffffffff8345eeb9>] l2tp_session_create+0x39/0x10f0 net/l2tp/l2tp_core.c:1744
 [<ffffffff8346354c>] pppol2tp_connect+0x10fc/0x1930 net/l2tp/l2tp_ppp.c:718
 [<ffffffff82dec596>] SYSC_connect+0x1b6/0x310 net/socket.c:1557
 [<ffffffff82deee04>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17

Freed by task 7157:
 [<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fdad2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fdad2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fa56c>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fa56c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fa56c>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fa56c>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff8345b440>] l2tp_session_free+0x170/0x200 net/l2tp/l2tp_core.c:1672
 [<ffffffff8345dcf1>] l2tp_session_dec_refcount_1 net/l2tp/l2tp_core.h:293 [inline]
 [<ffffffff8345dcf1>] l2tp_tunnel_closeall+0x2d1/0x3b0 net/l2tp/l2tp_core.c:1279
 [<ffffffff8345e85b>] l2tp_udp_encap_destroy+0x8b/0xf0 net/l2tp/l2tp_core.c:1300
 [<ffffffff8336cc51>] udpv6_destroy_sock+0xb1/0xd0 net/ipv6/udp.c:1421
 [<ffffffff82dfecdb>] sk_common_release+0x6b/0x300 net/core/sock.c:2680
 [<ffffffff8336bc05>] udp_lib_close+0x15/0x20 include/net/udp.h:190
 [<ffffffff831cfdda>] inet_release+0xfa/0x1d0 net/ipv4/af_inet.c:435
 [<ffffffff832f55a0>] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:424
 [<ffffffff82de7bdd>] sock_release+0x8d/0x1e0 net/socket.c:586
 [<ffffffff82de7d46>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff81523603>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81523b25>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118b984>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff8100361d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100361d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252
 [<ffffffff81007084>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
 [<ffffffff81007084>] syscall_return_slowpath arch/x86/entry/common.c:348 [inline]
 [<ffffffff81007084>] do_syscall_32_irqs_on arch/x86/entry/common.c:398 [inline]
 [<ffffffff81007084>] do_fast_syscall_32+0x614/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8800b74a8000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff8800b74a8000, ffff8800b74a8200)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff833fc7e7>]  [<ffffffff833fc7e7>] ip6t_do_table+0x297/0x1790 net/ipv6/netfilter/ip6_tables.c:361
RSP: 0018:ffff8801db307610  EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000008 RCX: 1ffff100385a9227
RDX: 0000000000000001 RSI: ffff8801c2d49100 RDI: ffff8801c2d49138
RBP: ffff8801db307830 R08: ffff8801db307750 R09: 0000000000000001
R10: 0000000000000001 R11: ffffed003b660eb7 R12: ffff8800ba388000
R13: ffff8800b66ccf80 R14: ffff8801db307a38 R15: ffff8801d48240bc
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000081163b4 CR3: 00000001d94e8000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000246 ffffffff847fce40 000000000000003a ffff8801d48240bc
 66e7fbb94da1c126 ffff8801d4824000 ffffffff83401050 ffff8801d48240bc
 ffff8801d48240d0 0000000000000000 ffff8801db307898 ffffffff82fb18f0
Call Trace:
 <IRQ> 
 [<ffffffff833fe2f5>] ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:60 [inline]
 [<ffffffff833fe2f5>] ip6table_mangle_hook+0x2e5/0x720 net/ipv6/netfilter/ip6table_mangle.c:82
 [<ffffffff82f93073>] nf_iterate+0x153/0x220 net/netfilter/core.c:274
 [<ffffffff82f932f6>] nf_hook_slow+0x1b6/0x340 net/netfilter/core.c:306
 [<ffffffff8335f98f>] nf_hook_thresh include/linux/netfilter.h:187 [inline]
 [<ffffffff8335f98f>] NF_HOOK_THRESH.constprop.24+0x2af/0x320 include/linux/netfilter.h:224
 [<ffffffff83360606>] NF_HOOK include/linux/netfilter.h:249 [inline]
 [<ffffffff83360606>] ndisc_send_skb+0x816/0xf80 net/ipv6/ndisc.c:471
 [<ffffffff83364d0a>] ndisc_send_rs+0x12a/0x430 net/ipv6/ndisc.c:646
 [<ffffffff83326e9d>] addrconf_rs_timer+0x30d/0x600 net/ipv6/addrconf.c:3524
 [<ffffffff812a0efb>] call_timer_fn+0x18b/0x860 kernel/time/timer.c:1185
 [<ffffffff812a2e54>] __run_timers kernel/time/timer.c:1261 [inline]
 [<ffffffff812a2e54>] run_timer_softirq+0x604/0xbb0 kernel/time/timer.c:1444
 [<ffffffff83776e57>] __do_softirq+0x227/0xa38 kernel/softirq.c:273
 [<ffffffff8113daa9>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff8113daa9>] irq_exit+0x119/0x140 kernel/softirq.c:391
 [<ffffffff837765bb>] exiting_irq arch/x86/include/asm/apic.h:653 [inline]
 [<ffffffff837765bb>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff83775510>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:737
 <EOI> 
 [<ffffffff81027e85>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027e85>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:290
 [<ffffffff810293fa>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:281
 [<ffffffff81221468>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81221b6d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81221b6d>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81221b6d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adc64>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: 3c 11 00 0f 85 87 12 00 00 48 8b b5 d0 fe ff ff 89 c0 48 8b 56 38 48 8d 1c c2 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 4e 12 00 00 48 8b 03 48 c7 c7 a0 5e 7f 84 48 
RIP  [<ffffffff833fc7e7>] ip6t_do_table+0x297/0x1790 net/ipv6/netfilter/ip6_tables.c:361
 RSP <ffff8801db307610>
---[ end trace 83983effb2dd50a3 ]---