binder: 22459:22460 got transaction with invalid number of fds (-2)
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BUG: KASAN: slab-out-of-bounds in cap_convert_nscap+0x501/0x610 security/commoncap.c:498
Read of size 4 at addr ffff8801bdcf22c0 by task syz-executor2/22469

CPU: 0 PID: 22469 Comm: syz-executor2 Not tainted 4.15.0-rc4-next-20171221+ #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 cap_convert_nscap+0x501/0x610 security/commoncap.c:498
 setxattr+0x365/0x400 fs/xattr.c:446
 SYSC_fsetxattr fs/xattr.c:508 [inline]
 SyS_fsetxattr+0x130/0x190 fs/xattr.c:497
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f5abf1b6c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000be
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 00000000200df000 RSI: 00000000207be000 RDI: 0000000000000015
RBP: 000000000000005c R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000212 R12: 00000000006ee940
R13: 00000000ffffffff R14: 00007f5abf1b76d4 R15: 0000000000000000

Allocated by task 22469:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc_node mm/slab.c:3673 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3680
 kmalloc_node include/linux/slab.h:558 [inline]
 kvmalloc_node+0x99/0xd0 mm/util.c:397
 kvmalloc include/linux/mm.h:541 [inline]
 setxattr+0x152/0x400 fs/xattr.c:435
 SYSC_fsetxattr fs/xattr.c:508 [inline]
 SyS_fsetxattr+0x130/0x190 fs/xattr.c:497
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 19905:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3489 [inline]
 kfree+0xd6/0x260 mm/slab.c:3804
 dccp_feat_val_destructor+0xd2/0xf0 net/dccp/feat.c:388
 dccp_feat_entry_destructor.part.5+0x40/0x60 net/dccp/feat.c:417
 dccp_feat_entry_destructor net/dccp/feat.c:416 [inline]
 dccp_feat_list_purge+0xc2/0x1e0 net/dccp/feat.c:549
 dccp_destroy_sock+0x2f4/0x3f0 net/dccp/proto.c:236
 inet_csk_destroy_sock+0x166/0x3f0 net/ipv4/inet_connection_sock.c:832
 dccp_close+0x84d/0xc10 net/dccp/proto.c:1079
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
 sock_release+0x8d/0x1e0 net/socket.c:593
 SYSC_socketpair net/socket.c:1393 [inline]
 SyS_socketpair+0x481/0x6f0 net/socket.c:1338
 entry_SYSCALL_64_fastpath+0x1f/0x96

The buggy address belongs to the object at ffff8801bdcf22c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8801bdcf22c0, ffff8801bdcf22e0)
The buggy address belongs to the page:
page:000000000fa6be25 count:1 mapcount:0 mapping:000000000d6ec13d index:0xffff8801bdcf2fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801bdcf2000 ffff8801bdcf2fc1 000000010000003f
raw: ffffea0006fbe960 ffffea00075804e0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801bdcf2180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801bdcf2200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801bdcf2280: fb fb fb fb fc fc fc fc 02 fc fc fc fc fc fc fc
                                           ^
 ffff8801bdcf2300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801bdcf2380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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