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

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Date:   Mon, 3 Oct 2016 12:22:25 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
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

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

> 
> - 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