switch ((type = le64_to_cpu(buf->InodeType))) {
case NFS_SPECFILE_LNK:
+ if (len == 0 || (len % 2)) {
+ cifs_dbg(VFS, "srv returned malformed nfs symlink buffer\n");
+ return -EIO;
+ }
+ /*
+ * Check that buffer does not contain UTF-16 null codepoint
+ * because Linux cannot process symlink with null byte.
+ */
+ if (UniStrnlen((wchar_t *)buf->DataBuffer, len/2) != len/2) {
+ cifs_dbg(VFS, "srv returned null byte in nfs symlink target location\n");
+ return -EIO;
+ }
data->symlink_target = cifs_strndup_from_utf16(buf->DataBuffer,
len, true,
cifs_sb->local_nls);
break;
case NFS_SPECFILE_CHR:
case NFS_SPECFILE_BLK:
+ /* DataBuffer for block and char devices contains two 32-bit numbers */
+ if (len != 8) {
+ cifs_dbg(VFS, "srv returned malformed nfs buffer for type: 0x%llx\n", type);
+ return -EIO;
+ }
+ break;
case NFS_SPECFILE_FIFO:
case NFS_SPECFILE_SOCK:
+ /* DataBuffer for fifos and sockets is empty */
+ if (len != 0) {
+ cifs_dbg(VFS, "srv returned malformed nfs buffer for type: 0x%llx\n", type);
+ return -EIO;
+ }
break;
default:
cifs_dbg(VFS, "%s: unhandled inode type: 0x%llx\n",