linux-kernel - Re: [PATCH] perf probe: check if *ptr2 is zero and not ptr2

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Date:   Mon, 3 Oct 2016 08:45:44 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Wang Nan <wangnan0@...wei.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf probe: check if *ptr2 is zero and not ptr2

Em Mon, Oct 03, 2016 at 12:22:25PM +0100, Colin Ian King escreveu:
> On 03/10/16 12:19, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Oct 03, 2016 at 11:34:31AM +0100, Colin King escreveu:
> >> From: Colin Ian King <colin.king@...onical.com>
> >>
> >> Static anaylsis with cppcheck detected an incorrect comparison:
> >> [tools/perf/util/probe-event.c:216]: (warning) Char literal compared with
> >> pointer 'ptr2'. Did you intend to dereference it?
> > 
> > What tool was used for that?
> 
> cppcheck https://github.com/danmar/cppcheck - I run it nearly daily on
> linux-next and linux

Thanks, I'll try to get it and use it before upstreaming stuff,

- Arnaldo
 
> > 
> > - Arnaldo
> >  
> >> Dereference ptr2 for the comparison to fix this.
> >>
> >> Fixes: 35726d3a4ca9 ("perf probe: Fix to cut off incompatible chars from group name")
> >> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> >> ---
> >>  tools/perf/util/probe-event.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> >> index fcfbef0..d281ae2 100644
> >> --- a/tools/perf/util/probe-event.c
> >> +++ b/tools/perf/util/probe-event.c
> >> @@ -213,7 +213,7 @@ static int convert_exec_to_group(const char *exec, char **result)
> >>  		goto out;
> >>  	}
> >>  
> >> -	for (ptr2 = ptr1; ptr2 != '\0'; ptr2++) {
> >> +	for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
> >>  		if (!isalnum(*ptr2) && *ptr2 != '_') {
> >>  			*ptr2 = '\0';
> >>  			break;
> >> -- 
> >> 2.9.3