Re: Secure Dereference of NULL-Pointer when using list.h

[Ricard Wanderlof <ricard.wanderlof@xxxxxxxx>]

On Wed, 4 Oct 2006, Jinesh K J wrote:

> operation is performed. When you write
>
> a = b;
>
> read operation is required on 'b', and a write on 'a'. But when you say
>
> a;  // no operation is specified here
>
> or
>
> ;  //  an empty statement
>
> neither read nor a write is asked to perform by us. The compiler will

I'm not too sure about this; when you say a;  it's actually an expression 
that has the value a . The fact that you don't use that value means that 
the compiler will probably optimize away the statement entirely, if 
optimization is enabled. But this is not the same case as taking the 
address of something in which no read is attempted at all.

But now we're getting far from kernel territory and into C and compiler 
details.

/Ricard
--
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
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