Re: Memory corrupted

[Akos Vandra <axos88 () gmail com>]

I was referring to the fact that malloc(0) should run fine, without any errors.
Turns out I indeed overlooked something, and really was writing the
pointer returned, so please disregard my report.

Regards,
  Ákos

On 14 March 2012 21:51, Guy Harris <guy () alum mit edu> wrote:
> On Mar 14, 2012, at 1:15 PM, Jakub Zawadzki wrote:
>
> > On Wed, Mar 14, 2012 at 09:01:07PM +0100, Akos Vandra wrote:
> > > Figured it out, however this is a bug in wireshark, I suppose.
> > > A call to ep_alloc(0) was the culprit. IMHO that should not be a
> > > problem, as I expect it to work as malloc works, and malloc should
> > > handle a 0 size, as stated in the C standard.
> >
> > In which way? It should return NULL (glib-like) or some not-NULL pointer (glibc-like)?
> > AFAIR in C standard it's UB.
>
> Implementation-defined behavior.
>
> C90:
>
>        If the size of the space requested is zero, the behavior is implementation-defined, the value returned shall 
> be either a null pointer or a unique pointer.
>
> C99:
>
>        If the size of the space requested is zero, the behavior is implementation- defined: either a null pointer is 
> returned, or the behavior is as if the size were some nonzero value, except that the returned pointer shall not be 
> used to access an object.
>
> C99 makes it clearer that, as you note, you should *not* attempt to dereference the pointer.
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