This patch corrects the following:

- Fixes a problem in which the dd command can corrupt output on very
  large files (2GB or greater) when the "conv=sparse" option is used.

- Fixes a problem that occurs with the dd command. When the seek option to the
  dd command is used to insert data into an existing output file, the resulting
  file, the resulting file is incorrect and all of the original data is lost.

- Fixes a problem with the dd command in which dd aborts after a read error.
  This problem occurs even when the "conv=noerror" parameter is specified.