linux-kernel - Re: [PATCH] perf probe: convert_name_to_addr() allocated the wrong size buffer for a function name

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Date:	Tue, 16 Oct 2012 17:16:27 +0900
From:	Hyeoncheol Lee <hyc.lee@...il.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	acme@...stprotocols.net, LKML <linux-kernel@...r.kernel.org>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH] perf probe: convert_name_to_addr() allocated the wrong
 size buffer for a function name

Hi,

2012/10/16 Srikar Dronamraju <srikar@...ux.vnet.ibm.com>:
> * Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> [2012-10-16 13:19:57]:
>
>> (2012/10/16 10:37), Hyeoncheol Lee wrote:
>> > convert_name_to_addr() allocated sizeof(char *) * MAX_PROBE_ARGS
>> > bytes for a function name
>>
>> Yeah, that one was from my laziness...
>>
>
> Guess not your fault, but mine.
>
>> >
>> > 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 |    5 +++--
>> >  1 file changed, 3 insertions(+), 2 deletions(-)
>> >
>> > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
>> > index 49a256e..bb40ed4 100644
>> > --- a/tools/perf/util/probe-event.c
>> > +++ b/tools/perf/util/probe-event.c
>> > @@ -2352,13 +2352,14 @@ 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) *
>> > +                         (3 + sizeof(unsigned long long) * 2));
>>
>> Could you comment that this is enough long here?
>
> Also can we move the arith into a macro?
>

I will do.

>>
>> >     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);
>> > +   sprintf(pp->function, "0x%llx", vaddr);
>>
>> And at least we should use snprintf instead of sprintf...
>> (I think ret = e_snprintf(...) is better)
>>
>
> Agree.

Yes

>
>> >     ret = 0;
>> >
>> >  out:
>> >
>>
>
> --
> Thanks and Regards
> Srikar
>

Thank you for your comment.
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