Re: [PATCH] Fix for crash while deleting rows on 64 bit systems

On Sun, 2012-03-18 at 11:37 -0500, Steven Elliott wrote:
> I believe I've fixed a problem where pgAdmin intermittently crashes on
> 64 bit systems while deleting rows.  The issues seems to be that, among
> other things, sqlTable::DeleteRows() in frm/frmEditGrid.cpp attempts to
> remove an element in lineIndex by shifting down the remaining elements.
> Unfortunately the "sizeof" is taking the size of the wrong thing.
>
> I suspect this is only an issue on systems where pointers and "int"s are
> different sizes, which should be 64 bit systems, but I have only have a
> 64 bit Linux system handy to try.
>
> Increasing the number of rows that follow the row deleted should
> increase the probability of getting a crash, but Valgrind always
> complains about bad reads and writes for the memmove() in question.
>
> Steps to reproduce the problem:
> 1) Choose a table that has roughly 200 or more rows.  Here's a dump of
> such a table:
>   http://selliott.org/pgadmin/table-200-rows.sql
> 2) Navigate to the "Edit Data" window (the window navigated to by
> selecting the View Data / View All Rows for the table in question).
> 3) Select a low numbered row, such as the fifth row.
> 4) Right click and select "Delete".  The crash may happen when the
> delete is confirmed after the subsequent dialog.
>

Quite impressive. I found this bug a few days ago and was unable to fix
it. So thank you very much. I applied it.


--
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com