linux-kernel - Re: [PATCH] perf probe: convert_name_to_addr() allocated the wrong size buffers for names

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Date:	Thu, 18 Oct 2012 10:20:37 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Hyeoncheol Lee <hyc.lee@...il.com>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"yrl.pp-manager.tt\@hitachi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH] perf probe: convert_name_to_addr() allocated the wrong size buffers for names

Hi,

On Wed, 17 Oct 2012 20:06:54 +0900, Masami Hiramatsu wrote:
> (2012/10/17 17:28), Hyeoncheol Lee wrote:
>> The function allocated wrong size buffers for names
>> 
>> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
>> Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
>> Signed-off-by: Hyeoncheol Lee <hyc.lee@...il.com>
>> ---
>>  tools/perf/util/probe-event.c |   11 +++++++----
>>  1 file changed, 7 insertions(+), 4 deletions(-)
>> 
>> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
>> index 49a256e..5cd7c42 100644
>> --- a/tools/perf/util/probe-event.c
>> +++ b/tools/perf/util/probe-event.c
>> @@ -2273,6 +2273,8 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
>>  	return available_user_funcs(target);
>>  }
>>  
>
> Please add a comment like below on the code.
>
> /*
>  * sizeof(type) * 2 returns the maximum length of hexadecimal number
>  * of type, because each half byte is encoding in one hex character.
>  * Another 3 bytes are for "0x" and null character.
>  */
>
> Others are OK for me :)
>
> Thanks!
>
>> +#define MAX_ADDRNAME_LEN  (3 + sizeof(unsigned long long) * 2)
>> +
>>  /*
>>   * uprobe_events only accepts address:
>>   * Convert function and any offset to address
>> @@ -2332,7 +2334,7 @@ static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec)
>>  	if (!pev->group) {
>>  		char *ptr1, *ptr2, *exec_copy;
>>  
>> -		pev->group = zalloc(sizeof(char *) * 64);
>> +		pev->group = zalloc(sizeof(char) * 64);

I guess we don't need this 'sizeof(char)' part?


>>  		exec_copy = strdup(exec);
>>  		if (!exec_copy) {
>>  			ret = -ENOMEM;
>> @@ -2352,14 +2354,15 @@ static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec)
>>  		free(exec_copy);
>>  	}
>>  	free(pp->function);
>> -	pp->function = zalloc(sizeof(char *) * MAX_PROBE_ARGS);
>> +	pp->function = zalloc(sizeof(char) * MAX_ADDRNAME_LEN);

Ditto.

Thanks,
Namhyung


>>  	if (!pp->function) {
>>  		ret = -ENOMEM;
>>  		pr_warning("Failed to allocate memory by zalloc.\n");
>>  		goto out;
>>  	}
>> -	e_snprintf(pp->function, MAX_PROBE_ARGS, "0x%llx", vaddr);
>> -	ret = 0;
>> +	ret = e_snprintf(pp->function, MAX_ADDRNAME_LEN, "0x%llx", vaddr);
>> +	if (ret > 0)
>> +		ret = 0;
>>  
>>  out:
>>  	if (map) {
>> 
--
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