ntfs: Fix panic about slab-out-of-bounds caused by ntfs_listxattr()

In the Linux kernel, the following vulnerability has been resolved:

ntfs: Fix panic about slab-out-of-bounds caused by ntfs_listxattr()

Here is a BUG report from syzbot:

BUG: KASAN: slab-out-of-bounds in ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]

BUG: KASAN: slab-out-of-bounds in ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710

Read of size 1 at addr ffff888021acaf3d by task syz-executor128/3632

Call Trace:

ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]

ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710

vfs_listxattr fs/xattr.c:457 [inline]

listxattr+0x293/0x2d0 fs/xattr.c:804

Fix the logic of ea_all iteration. When the ea->name_len is 0,

return immediately, or Add2Ptr() would visit invalid memory

in the next loop.

[[email protected]: lines of the patch have changed]