Re: [dpkg:src/unpack.c] Possible unused call to strcpy

[Guillem Jover <guillem@debian.org>]

Hi!

On Sat, 2014-04-26 at 10:12:49 +0200, Niels Thykier wrote:
> I spotted this piece of code in src/unpack.c (around line 614)
> """
>  /*
>    * OK, we're going ahead.
>    */
> 
>   trig_activate_packageprocessing(pkg);
>   strcpy(cidirrest, TRIGGERSCIFILE);
>   trig_parse_ci(cidir, NULL, trig_cicb_statuschange_activate, pkg,
>     &pkg->available);
> 
>   /* Read the conffiles, and copy the hashes across. */
>   newconffiles = NULL;
>   newconffileslastp = &newconffiles;
>   push_cleanup(cu_fileslist, ~0, NULL, 0, 0);
>   strcpy(cidirrest,CONFFILESFILE);
> """
> 
> It seems to me that "cidirrest" is not read between the two strcpy-calls.

cidirrest is being used to append stuff to cidir, with both being
initialized at the beginning of the function. In the particular case
you point out, the next line makes use of that value in the
trig_parse_ci(), and the other is following by an fopen() call also
making use of it.

That variable and the other similar usage patterns around the code is
something I've pending to change, as it's quite confusing and makes it
difficult in some cases to check if we are within the buffer bounds.

Thanks,
Guillem