GNU bug report logs - #17010
Bug#739752: coreutils: ln segfaults when run with --relative and an empty target

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Jim Meyering <jim <at> meyering.net>
Subject: bug#17010: closed (Re: bug#17010: Bug#739752: coreutils: ln
 segfaults when run with --relative and an empty target)
Date: Fri, 14 Mar 2014 16:28:03 +0000

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Your bug report

#17010: Bug#739752: coreutils: ln segfaults when run with --relative and an empty target

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 17010 <at> debbugs.gnu.org.

-- 
17010: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17010
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Jim Meyering <jim <at> meyering.net>
To: Pádraig Brady <P <at> draigbrady.com>
Cc: Erik Bernstein <erik <at> fscking.org>, 17010 <17010-done <at> debbugs.gnu.org>,
 739752 <739752 <at> bugs.debian.org>
Subject: Re: bug#17010: Bug#739752: coreutils: ln segfaults when run with
 --relative and an empty target
Date: Fri, 14 Mar 2014 09:27:24 -0700

On Fri, Mar 14, 2014 at 4:49 AM, Pádraig Brady <P <at> draigbrady.com> wrote:
...
> Hence since c_f_m() can validly fail even with CAN_MISSING,
> I agree your patch is correct.
>
> Please push.

Done.

[Message part 3 (message/rfc822, inline)]

From: Jim Meyering <jim <at> meyering.net>
To: Erik Bernstein <erik <at> fscking.org>, 739752 <at> bugs.debian.org,
 bug-coreutils <at> gnu.org
Cc: Debian Bug Tracking System <submit <at> bugs.debian.org>
Subject: Re: Bug#739752: coreutils: ln segfaults when run with --relative and
 an empty target
Date: Thu, 13 Mar 2014 18:42:30 -0700

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On Sat, Feb 22, 2014 at 1:57 AM, Erik Bernstein <erik <at> fscking.org> wrote:
> Package: coreutils
> Version: 8.21-1
> Severity: normal
>
> Hi,
>
> when ln is run with --relative --symbolic and and empty string as the
> target, it ungracefully dies with a segmentation fault. The memory
> violation appears to happen in src/relpath.c:38 when the two input paths
> are checked for leading slashes:
>
>   if ((path1[1] == '/') != (path2[1] == '/'))
>
> How to reproduce:
> [1] Open a terminal
> [2] run: ln -sr '' foobar
>
> Result: segmentation fault  ln -sr '' foobar
> Expected result: Some kind of error message
...

Thank you for the bug report!
That also affected the very latest code in git.
Here is a patch:

[k.txt (text/plain, attachment)]

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