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BUG: KASAN: global-out-of-bounds in strscpy+0x20e/0x2c0 lib/string.c:206
Read of size 8 at addr ffffffff8677e1f8 by task syz-executor.5/10004

CPU: 0 PID: 10004 Comm: syz-executor.5 Not tainted 4.14.134 #30
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+0x138/0x19c lib/dump_stack.c:53
 print_address_description.cold+0x5/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 strscpy+0x20e/0x2c0 lib/string.c:206
 prepare_error_buf+0x94/0x1aa0 fs/reiserfs/prints.c:213
 __reiserfs_warning+0x9f/0xb0 fs/reiserfs/prints.c:288
 reiserfs_fill_super+0xa71/0x2b20 fs/reiserfs/super.c:1980
 mount_bdev+0x2be/0x370 fs/super.c:1134
 get_super_block+0x35/0x40 fs/reiserfs/super.c:2605
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
kobject: 'queues' (ffff88808ba3b548): kobject_uevent_env: filter function caused the event to drop!
kobject: 'rx-0' (ffff8880a0dcc610): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'rx-0' (ffff8880a0dcc610): kobject_uevent_env
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c27a
kobject: 'rx-0' (ffff8880a0dcc610): fill_kobj_path: path = '/devices/virtual/net/ppp0/queues/rx-0'
RSP: 002b:00007fb50bf5fa88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb50bf5fb40 RCX: 000000000045c27a
RDX: 00007fb50bf5fae0 RSI: 0000000020000380 RDI: 00007fb50bf5fb00
RBP: 0000000000000000 R08: 00007fb50bf5fb40 R09: 00007fb50bf5fae0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003
R13: 00000000004c8a7f R14: 00000000004df8b8 R15: 00000000ffffffff

The buggy address belongs to the variable:
kobject: 'tx-0' (ffff8880a0f54018): kobject_add_internal: parent: 'queues', set: 'queues'
 __func__.31301+0x2dd8/0x3a60

Memory state around the buggy address:
 ffffffff8677e080: 01 fa fa fa fa fa fa fa 01 fa fa fa fa fa fa fa
 ffffffff8677e100: 00 00 00 00 00 07 fa fa fa fa fa fa 00 00 00 07
>ffffffff8677e180: fa fa fa fa 00 fa fa fa fa fa fa fa 00 00 00 04
                                                                ^
 ffffffff8677e200: fa fa fa fa 00 fa fa fa fa fa fa fa 00 00 00 00
 ffffffff8677e280: 00 00 00 00 02 fa fa fa fa fa fa fa 00 00 00 00
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