Suspicous code in kdelibs-3.5.2

Cristian Tibirna tibirna at
Sat Apr 8 14:59:59 BST 2006

On 5 April 2006 10:26, Christoph Bartoschek wrote:
> - kdeprint/management/kxmlcommanddlg.cpp:620
> If opt becomes NULL in line 573 and the switch in line 585 selects the
> default case, then line 620 crashes.

That code can't crash. The "opt" pointer will always get initialized. 
m_type->currentItem() (used to initialize "type", the switch variable) must 
have values in the interval [0,4] \in I (the multitude of integer numbers) 
and gets augmented by DrBase::String. Thus, the only possible values in the 
switch are those checked.

If I had a "programming-by-contract" frame in KDE, I would have added an 
assertion in development-mode. Without one, this would mean adding useless 
translatable strings (for a KMessageBox::error) and break too many freeze 

> -----------------------------------------------------------------
> Cases from switch statements that fall through in some cases but
> do not have a fall through comment as in most such cases.
> ------------------------------------------------------------------
> - kdeprint/management/kmwname.cpp:66
What a "fall through comment is"?  That code is correct.

> - kdeprint/kprintprocess.cpp:78 
I can't follow thoroughly the logic of that code, to say if fall-through is 
OK. I think it is. Wouldn't know what comment to put either.


Thanks a lot for the excellent diagnoses. Better worry than sorry ;-)

Cristian Tibirna
KDE developer .. tibirna at ..

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