================================================================== BUG: KASAN: slab-out-of-bounds in ntfs_attr_find+0x9e9/0xb20 fs/ntfs/attrib.c:599 Read of size 4 at addr ffff88804fb31fff by task syz-executor.4/30651 CPU: 0 PID: 30651 Comm: syz-executor.4 Not tainted 5.9.0-rc6-syzkaller #0 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+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 ntfs_attr_find+0x9e9/0xb20 fs/ntfs/attrib.c:599 ntfs_attr_lookup+0x1051/0x2060 fs/ntfs/attrib.c:1189 ntfs_read_inode_mount+0x730/0x22b0 fs/ntfs/inode.c:1833 ntfs_fill_super+0xa63/0x8560 fs/ntfs/super.c:2857 mount_bdev+0x32e/0x3f0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2875 [inline] path_mount+0x1387/0x20a0 fs/namespace.c:3192 do_mount fs/namespace.c:3205 [inline] __do_sys_mount fs/namespace.c:3413 [inline] __se_sys_mount fs/namespace.c:3390 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3390 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460bca Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 87 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 87 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f03c1cdba88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f03c1cdbb20 RCX: 0000000000460bca RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f03c1cdbae0 RBP: 00007f03c1cdbae0 R08: 00007f03c1cdbb20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020086e00 Allocated by task 12892: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x13a/0x3f0 mm/slab.c:3482 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags fs/namei.c:2646 [inline] user_path_at_empty+0xa1/0x100 fs/namei.c:2646 do_readlinkat+0xcd/0x2f0 fs/stat.c:419 __do_sys_readlinkat fs/stat.c:446 [inline] __se_sys_readlinkat fs/stat.c:443 [inline] __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:443 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 12892: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kmem_cache_free.part.0+0x74/0x1e0 mm/slab.c:3693 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x3b1/0x560 fs/namei.c:2376 do_readlinkat+0xcd/0x2f0 fs/stat.c:419 __do_sys_readlinkat fs/stat.c:446 [inline] __se_sys_readlinkat fs/stat.c:443 [inline] __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:443 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88804fb30380 which belongs to the cache names_cache of size 4096 The buggy address is located 3199 bytes to the right of 4096-byte region [ffff88804fb30380, ffff88804fb31380) The buggy address belongs to the page: page:00000000acff08f4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4fb30 head:00000000acff08f4 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001272708 ffffea00027b1c88 ffff88821bc47a00 raw: 0000000000000000 ffff88804fb30380 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804fb31e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804fb31f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804fb31f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88804fb32000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804fb32080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================