linux-kernel - Re: [PATCH v1 03/11] perf top: Smatch: Fix potential NULL pointer dereference

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Date:   Wed, 3 Jul 2019 15:30:49 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
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>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Andi Kleen <ak@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Davidlohr Bueso <dave@...olabs.net>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Changbin Du <changbin.du@...el.com>,
        Eric Saint-Etienne <eric.saint.etienne@...cle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 03/11] perf top: Smatch: Fix potential NULL pointer
 dereference

Em Tue, Jul 02, 2019 at 06:34:12PM +0800, Leo Yan escreveu:
> Based on the following report from Smatch, fix the potential
> NULL pointer dereference check.
> 
>   tools/perf/builtin-top.c:109
>   perf_top__parse_source() warn: variable dereferenced before check 'he'
>   (see line 103)
> 
>   tools/perf/builtin-top.c:233
>   perf_top__show_details() warn: variable dereferenced before check 'he'
>   (see line 228)
> 
> tools/perf/builtin-top.c
> 101 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
> 102 {
> 103         struct perf_evsel *evsel = hists_to_evsel(he->hists);
>                                                       ^^^^
> 104         struct symbol *sym;
> 105         struct annotation *notes;
> 106         struct map *map;
> 107         int err = -1;
> 108
> 109         if (!he || !he->ms.sym)
> 110                 return -1;
> 
> This patch moves the values assignment after validating pointer 'he'.

Applied, thanks,

- Arnaldo