Re: [PATCH 1/3] perf script python: Fix string vs byte array resolving

[Steven Rostedt]

On Fri, 15 Jul 2016 18:13:10 +0200
Jiri Olsa <jolsa@xxxxxxxxxx> wrote:

> On Fri, Jul 15, 2016 at 12:02:31PM -0400, Steven Rostedt wrote:
> 
> SNIP
> 
> > > for "AA\1\0" this returns "1" although that should return "0".
> > > 
> > > orig len 4
> > > decremented len 3
> > > for:
> > > 0 1
> > > 
> > > index 2 would not be inspected. Or am I missing something?
> > > 
> > > I think that the for check should be "i < len"  
> > 
> > Yes it should be. I think we got the two solutions mixed up.
> > 
> > With the above len--, it should be i < len, but when we did the check
> > for zero at the end, we needed the i < len - 1  
> 
> ugh right.. should be 'i < len' check in the for loop,
> 
> there's also the patch 2/3 that needs to be changed
> 

I'm wondering if we should also add at the beginning:

	if (!len)
		return 0;

Otherwise we will be accessing out of bounds with the len-1.

-- Steve