Re: ***UNCHECKED*** delete.c flush_file() adds file size to current_blocks w/o sanity check

[Paul Eggert]

Thanks for the bug report and test case. I'm puzzled about the symptoms 
reported, as my copy of GNU tar 1.35, when built on Ubuntu 23.10 x86-64, 
outputs this confusing diagnostic:

  tar: rmtlseek not stopped at a record boundary
  tar: Error is not recoverable: exiting now

when I run 'tar tvf gtar13c.tar', whereas your copy apparently does not. 
However, your test case with 'tar --delete' indeed has a segmentation 
violation.

I installed the attached three patches into the master repository 
<https://savannah.gnu.org/git/?group=tar>. The first fixes the confusing 
diagnostic. The second fixes an unchecked integer overflow nearby. And 
the third should fix the bug you reported.

Thanks again.

0001-tar-improve-diagnostic-for-truncated-archive.patch
Description: Text Data

0002-tar-fix-unlikely-overflow.patch
Description: Text Data

0003-tar-fix-current_block-confusion.patch
Description: Text Data