linux-kernel - Re: perf script, libperf: python binding bug (bytearrays vs. strings)

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Date:   Mon, 28 Sep 2020 15:39:42 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Hagen Paul Pfeifer <hagen@...u.net>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: perf script, libperf: python binding bug (bytearrays vs. strings)

On Mon, Sep 28, 2020 at 12:43:11PM +0200, Hagen Paul Pfeifer wrote:
> * Jiri Olsa | 2020-09-28 12:08:08 [+0200]:
> 
> >patch below fixes it for me, but seems strange this was
> >working till now.. maybe you're the only one using this
> >with python3 ;-)
> 
> and I thought python2 is obsolete and not maintained anymore ... ;-)
> Anyway, the patch fixed everything: no more garbage for Python2 and Python3
> as well as no bytearray type Python3!
> 
> Tested-by: Hagen Paul Pfeifer <hagen@...u.net>
> 
> Thank you Jiri!
> 
> Probably this patch should be applied on stable too!? Not sure when the 
> problem was introduced.

great, I'll check on that and send full patch later, thanks 

jirka

> 
> Hagen
> 
> >jirka
> >
> >
> >---
> >diff --git a/tools/perf/util/print_binary.c b/tools/perf/util/print_binary.c
> >index 599a1543871d..13fdc51c61d9 100644
> >--- a/tools/perf/util/print_binary.c
> >+++ b/tools/perf/util/print_binary.c
> >@@ -50,7 +50,7 @@ int is_printable_array(char *p, unsigned int len)
> > 
> > 	len--;
> > 
> >-	for (i = 0; i < len; i++) {
> >+	for (i = 0; i < len && p[i]; i++) {
> > 		if (!isprint(p[i]) && !isspace(p[i]))
> > 			return 0;
> > 	}
> >
>