NetBSD Problem Report #55568

From gson@gson.org  Thu Aug 13 16:12:16 2020
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Date: Thu, 13 Aug 2020 19:12:10 +0300 (EEST)
From: gson@gson.org (Andreas Gustafsson)
Reply-To: gson@gson.org (Andreas Gustafsson)
To: gnats-bugs@NetBSD.org
Subject: tar(1) prints "(null)"
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>Number:         55568
>Category:       bin
>Synopsis:       tar(1) prints "(null)"
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Aug 13 16:15:00 +0000 2020
>Closed-Date:    Sat Aug 22 13:42:31 +0000 2020
>Last-Modified:  Sat Aug 22 13:42:31 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD 9.0
>Organization:
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

Attempting to extract a tar(1) archive overwriting existing files that
one lacks write permission to causes tar to to print confusing
messages that includes the string "(null)".  This probably means tar
is trying to print a null pointer, which arguably falls in the
category of "undefined behavior".

>How-To-Repeat:

As a non-root user:

cd /usr/tests/bin/tar
tar cf /tmp/test.tar .
tar xf /tmp/test.tar

This prints:

./: Can't restore time
./Atffile: (null)
./t_tar: (null)
tar: Error exit delayed from previous errors.

>Fix:

>Release-Note:

>Audit-Trail:
From: "Christos Zoulas" <christos@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/55568 CVS commit: src/external/bsd/libarchive/dist/libarchive
Date: Fri, 14 Aug 2020 10:42:45 -0400

 Module Name:	src
 Committed By:	christos
 Date:		Fri Aug 14 14:42:45 UTC 2020

 Modified Files:
 	src/external/bsd/libarchive/dist/libarchive: archive_write_disk_posix.c

 Log Message:
 PR/55568: Andreas Gustafsson: Set the error when failing to create a temp file.


 To generate a diff of this commit:
 cvs rdiff -u -r1.5 -r1.6 \
     src/external/bsd/libarchive/dist/libarchive/archive_write_disk_posix.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

State-Changed-From-To: open->closed
State-Changed-By: gson@NetBSD.org
State-Changed-When: Sat, 22 Aug 2020 13:42:31 +0000
State-Changed-Why:
Confirmed fixed, thanks.


>Unformatted:

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