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    • Ronnie Sahlberg's avatar
      cifs: fix crash querying symlinks stored as reparse-points · 5de254dc
      Ronnie Sahlberg authored
      We never parsed/returned any data from .get_link() when the object is a windows reparse-point
      containing a symlink. This results in the VFS layer oopsing accessing an uninitialized buffer:
      
      ...
      [  171.407172] Call Trace:
      [  171.408039]  readlink_copy+0x29/0x70
      [  171.408872]  vfs_readlink+0xc1/0x1f0
      [  171.409709]  ? readlink_copy+0x70/0x70
      [  171.410565]  ? simple_attr_release+0x30/0x30
      [  171.411446]  ? getname_flags+0x105/0x2a0
      [  171.412231]  do_readlinkat+0x1b7/0x1e0
      [  171.412938]  ? __ia32_compat_sys_newfstat+0x30/0x30
      ...
      
      Fix this by adding code to handle these buffers and make sure we do return a valid buffer
      to .get_link()
      
      CC: Stable <stable@vger.kernel.org>
      Signed-off-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
      Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
      5de254dc
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