linux-kernel - Re: [PATCH][next] perf tests: fix out of bounds access on array fd when cnt is 100

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Date:   Wed, 14 Mar 2018 16:00:16 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] perf tests: fix out of bounds access on array fd
 when cnt is 100

Em Wed, Mar 14, 2018 at 05:33:54PM +0000, Colin King escreveu:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently when cnt is 100 an array bounds overflow occurs on the assignment
> of fd[cnt]. Fix this by performing the bounds check on cnt before writing
> to fd.
> 
> Detected by cppcheck:
> tools/perf/tests/bp_account.c:115: (warning) Either the condition
> 'cnt==100' is redundant or the array 'fd[100]' is accessed at index 100,
> which is out of bounds.
> 
> Fixes: 032db28e5fa3 ("perf tests: Add breakpoint accounting/modify test")

Thanks, applied.

- Arnaldo