Description of problem:

Extracting a large sparse file by name from a gnu format tar archive fails. 
With posix format, both extracting and listing fails.

Version-Release number of selected component (if applicable):

1.15.1-11.FC4

How reproducible:

Always

Steps to Reproduce:

On a filesystem that supports sparse files (e.g. ext3), run the following:

$ dd of=sparsefile seek=4096 bs=1M count=0

$ tar -c --sparse --format=gnu -f sparsefile.gtar sparsefile

$ tar -x -f sparsefile.gtar -O sparsefile | cat >/dev/null
tar: sparsefile: Cannot seek to 4294967296: Invalid argument
tar: Error exit delayed from previous errors

$ tar -c --sparse --format=posix -f sparsefile.ptar sparsefile

$ tar -t -v -f sparsefile.ptar
-rw-rw-r-- eswierk/eswierk 4294967296 2006-03-14 13:22:30 sparsefile
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now

$ tar -x -f sparsefile.ptar -O sparsefile | cat >/dev/null
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now

If you repeat the above procedure with a smaller sparse file (1 MB instead of
4096 MB), all the tar operations succeed.