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Message-ID:	<5208EF91.7070504@cwilson.fastmail.fm>
Date:	Mon, 12 Aug 2013 10:22:09 -0400
From:	Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
Subject:	Re: Patch for run-1.3.0-1 core dump
References:	<CAOJ7xCsuuhNmtz_ybGJoEeUAdWhJ1Y3+9d5mBtATH-F=VpkYGg AT mail DOT gmail DOT com>
In-Reply-To:	<CAOJ7xCsuuhNmtz_ybGJoEeUAdWhJ1Y3+9d5mBtATH-F=VpkYGg@mail.gmail.com>

On 8/10/2013 1:34 PM, foo wrote:
> Whenever I execute run.exe, it generates run.exe.stackdump.
>
> At line 370 in run.c, run2_freeargv() tries to free newargv, and
> run2_freeqrgv() expects that newargv is terminated by NULL. However,
> in shifting newargv at line 253-256, it fails to shift NULL
> terminator. Therefore, run2_freeargv() frees memory illegally.
> The following patch is a workaround.
>
> --- run.c.old
> +++ run.c.new
> @@ -252,7 +252,7 @@
>         newargv = run2_dupargv (argv);
>         /* discard newargv[0] and shift up */
>         free (newargv[0]);
> -      for (newargc = 1; newargc < argc; newargc++)
> +      for (newargc = 1; newargv[newargc-1] != NULL; newargc++)
>            newargv[newargc-1] = newargv[newargc];
>         newargc = argc - 1;

Thanks for the bug report and the patch. I'll investigate and update the 
package soon.

--
Chuck



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