================================================================== BUG: KASAN: global-out-of-bounds in strscpy+0x20e/0x2c0 lib/string.c:206 Read of size 8 at addr ffffffff8677d6f8 by task syz-executor.1/8086 CPU: 0 PID: 8086 Comm: syz-executor.1 Not tainted 4.14.113 #3 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 FAT-fs (loop0): bogus number of directory entries (515) kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xaf/0x2b5 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 FAT-fs (loop0): Can't find a valid FAT filesystem __reiserfs_warning+0x9f/0xb0 fs/reiserfs/prints.c:288 reiserfs_fill_super+0xa71/0x2b20 fs/reiserfs/super.c:1980 mount_bdev+0x2c1/0x370 fs/super.c:1134 get_super_block+0x35/0x40 fs/reiserfs/super.c:2605 mount_fs+0x9d/0x2a7 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 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3072 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b69a RSP: 002b:00007faa05d44a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007faa05d44b40 RCX: 000000000045b69a RDX: 00007faa05d44ae0 RSI: 0000000020000200 RDI: 00007faa05d44b00 RBP: 0000000000000000 R08: 00007faa05d44b40 R09: 00007faa05d44ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 R13: 00000000004c782d R14: 00000000004dd880 R15: 00000000ffffffff The buggy address belongs to the variable: __func__.31266+0x2dd8/0x3a60 Memory state around the buggy address: ffffffff8677d580: 01 fa fa fa fa fa fa fa 01 fa fa fa fa fa fa fa ffffffff8677d600: 00 00 00 00 00 07 fa fa fa fa fa fa 00 00 00 07 >ffffffff8677d680: fa fa fa fa 00 fa fa fa fa fa fa fa 00 00 00 04 ^ ffffffff8677d700: fa fa fa fa 00 fa fa fa fa fa fa fa 00 00 00 00 ffffffff8677d780: 00 00 00 00 02 fa fa fa fa fa fa fa 00 00 00 00 ==================================================================