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From: Namhyung Kim <namhyung@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Paul Mackerras <paulus@samba.org>, Namhyung Kim <namhyung.kim@lge.com>,
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        Adrian Hunter <adrian.hunter@intel.com>,
        David Ahern <dsahern@gmail.com>, Stephane Eranian <eranian@google.com>,
        Andi Kleen <andi@firstfloor.org>, stable@vger.kernel.org
Subject: Re: [PATCH v3] perf tools: Fix build-id matching on vmlinux
References: <1411353945-16576-1-git-send-email-namhyung@kernel.org>
	<20140922051630.GA18588@gmail.com>
Date: Mon, 22 Sep 2014 16:31:49 +0900
In-Reply-To: <20140922051630.GA18588@gmail.com> (Ingo Molnar's message of
	"Mon, 22 Sep 2014 07:16:30 +0200")
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Hi Ingo,

On Mon, 22 Sep 2014 07:16:30 +0200, Ingo Molnar wrote:
> * Namhyung Kim <namhyung@kernel.org> wrote:
>> +		list_for_each_entry(dso, &machine->kernel_dsos, node) {
>> +			const char *suffix;
>> +
>> +			suffix = dso->long_name + strlen(dso->long_name) - 3;
>> +			if (strcmp(suffix, ".ko")) {
>> +				kernel = dso;
>> +				break;
>> +			}
>
> Is strlen(dso->long_name) guaranteed to be >= 3? If not then you 
> should probably check for it, otherwise we might strcmp into 
> invalid memory.

I *think* they are all valid kernel modules so length should be greater
than 3.  But I also think that adding such an extra check won't cause
any harm.  So I'll change to check it in v4. :)

Thanks for your review!
Namhyung