binder_alloc: binder_alloc_mmap_handler: 10623 20fff000-21000000 already mapped failed -16
binder: undelivered TRANSACTION_ERROR: 29201
==================================================================
BUG: KASAN: use-after-free in nla_strlcpy+0x13d/0x150 lib/nlattr.c:314
Read of size 1 at addr ffff8801b075bac0 by task syz-executor0/10651

CPU: 0 PID: 10651 Comm: syz-executor0 Not tainted 4.17.0-rc6+ #92
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+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 nla_strlcpy+0x13d/0x150 lib/nlattr.c:314
 nfnl_acct_new+0x574/0xc50 net/netfilter/nfnetlink_acct.c:118
 nfnetlink_rcv_msg+0xdb5/0xff0 net/netfilter/nfnetlink.c:212
 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448
 nfnetlink_rcv+0x1fe/0x1ba0 net/netfilter/nfnetlink.c:513
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x805/0x940 net/socket.c:2117
 __sys_sendmsg+0x115/0x270 net/socket.c:2155
 __compat_sys_sendmsg net/compat.c:756 [inline]
 __do_compat_sys_sendmsg net/compat.c:763 [inline]
 __se_compat_sys_sendmsg net/compat.c:760 [inline]
 __ia32_compat_sys_sendmsg+0x7a/0xb0 net/compat.c:760
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f0ccb9
RSP: 002b:00000000f5f080ac EFLAGS: 00000282 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 0000000020000080
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 6641:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554
 dup_mmap kernel/fork.c:450 [inline]
 dup_mm kernel/fork.c:1234 [inline]
 copy_mm kernel/fork.c:1288 [inline]
 copy_process.part.38+0x2d37/0x6e90 kernel/fork.c:1794
 copy_process kernel/fork.c:1607 [inline]
 _do_fork+0x291/0x12a0 kernel/fork.c:2088
 __do_sys_clone kernel/fork.c:2195 [inline]
 __se_sys_clone kernel/fork.c:2189 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2189
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 10479:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
 remove_vma+0x164/0x1b0 mm/mmap.c:185
 exit_mmap+0x35d/0x5a0 mm/mmap.c:3116
 __mmput kernel/fork.c:961 [inline]
 mmput+0x251/0x610 kernel/fork.c:982
 exec_mmap fs/exec.c:1044 [inline]
 flush_old_exec+0xb94/0x20e0 fs/exec.c:1276
 load_elf_binary+0xa33/0x5610 fs/binfmt_elf.c:869
 search_binary_handler+0x17d/0x570 fs/exec.c:1653
 exec_binprm fs/exec.c:1695 [inline]
 do_execveat_common.isra.34+0x16ce/0x2590 fs/exec.c:1817
 do_execve fs/exec.c:1862 [inline]
 __do_sys_execve fs/exec.c:1943 [inline]
 __se_sys_execve fs/exec.c:1938 [inline]
 __x64_sys_execve+0x8d/0xb0 fs/exec.c:1938
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801b075ba50
 which belongs to the cache vm_area_struct of size 200
The buggy address is located 112 bytes inside of
 200-byte region [ffff8801b075ba50, ffff8801b075bb18)
The buggy address belongs to the page:
page:ffffea0006c1d6c0 count:1 mapcount:0 mapping:ffff8801b075b000 index:0xffff8801b075b318
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801b075b000 ffff8801b075b318 0000000100000003
raw: ffffea00075a6c20 ffffea00075da960 ffff8801da97a840 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b075b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b075ba00: fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb
>ffff8801b075ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8801b075bb00: fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb
 ffff8801b075bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================