Thread: fix ecpg core dump when there's a very long struct variable name in .pgc file

hi

I found a small bug in ecpg command and try to fix it.
Please check if it is correct.

When use a struct variable whose name length is very very long such as 12KB in .pgc source,
ecpg will core dump because of buffer overflow if precompile the .pgc file.

$ ecpg testLongStructName.pgc
Segmentation fault (core dumped)


Normally no body will write a variable with so long name,
but whether it's better to fix it.


Best Regards，
Chen Huajun

sorry,There's a miss(with out free memory) in that patch sended just now,
and resend it.

Best Regards，
Chen Huajun

(2012/11/22 18:09), Chen Huajun wrote:
> hi
>
> I found a small bug in ecpg command and try to fix it.
> Please check if it is correct.
>
> When use a struct variable whose name length is very very long such as 12KB in .pgc source,
> ecpg will core dump because of buffer overflow if precompile the .pgc file.
>
> $ ecpg testLongStructName.pgc
> Segmentation fault (core dumped)
>
>
> Normally no body will write a variable with so long name,
> but whether it's better to fix it.
>
>
> Best Regards，
> Chen Huajun
>
>
>
>

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On Thu, Nov 22, 2012 at 06:09:20PM +0800, Chen Huajun wrote:
> When use a struct variable whose name length is very very long such as 12KB in .pgc source,
> ecpg will core dump because of buffer overflow if precompile the .pgc file.

How on earth did you run into this? :)

I absolutely agree that this is better be fixed and cjust committed the second
version of your patch.

Thanks.

Michael
--
Michael Meskes
Michael at Fam-Meskes dot De, Michael at Meskes dot (De|Com|Net|Org)
Michael at BorussiaFan dot De, Meskes at (Debian|Postgresql) dot Org
Jabber: michael.meskes at gmail dot com
VfL Borussia! Força Barça! Go SF 49ers! Use Debian GNU/Linux, PostgreSQL

> How on earth did you run into this? :)

ooh, first I saw the code accidentally,it looks a bit dangerous and differents from the function ECPGdump_a_simple()
above,
And then I tried to write a test to raise some errors.

Thanks for your comment,I will add the patch into commitfest later.
It maybe my first patch for open source.
And I am glad if I can do more for PostgreSQL which is so fine.:)

Regards,
Chen Huajun
(2012/11/23 21:42), Michael Meskes wrote:
> On Thu, Nov 22, 2012 at 06:09:20PM +0800, Chen Huajun wrote:
>> When use a struct variable whose name length is very very long such as 12KB in .pgc source,
>> ecpg will core dump because of buffer overflow if precompile the .pgc file.
>
> How on earth did you run into this? :)
>
> I absolutely agree that this is better be fixed and cjust committed the second
> version of your patch.
>
> Thanks.
>
> Michael

On Sun, Nov 25, 2012 at 08:02:33PM +0800, Chen Huajun wrote:
> Thanks for your comment,I will add the patch into commitfest later.

No need for that, the patch is already committed to the archive.

> It maybe my first patch for open source.

It definitely is then.

Michael
--
Michael Meskes
Michael at Fam-Meskes dot De, Michael at Meskes dot (De|Com|Net|Org)
Michael at BorussiaFan dot De, Meskes at (Debian|Postgresql) dot Org
Jabber: michael.meskes at gmail dot com
VfL Borussia! Força Barça! Go SF 49ers! Use Debian GNU/Linux, PostgreSQL

(2012/11/25 22:18), Michael Meskes wrote:> On Sun, Nov 25, 2012 at 08:02:33PM +0800, Chen Huajun wrote:>> Thanks for
yourcomment,I will add the patch into commitfest later.>> No need for that, the patch is already committed to the
archive.

Oh,I got it,Thanks!


-- 
Regards,
Chen Huajun