linux-kernel - Re: [PATCH] perf script: avoid null dereference on symbol

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Date:   Wed, 22 Apr 2020 10:20:16 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf script: avoid null dereference on symbol

On Mon, Apr 20, 2020 at 05:43:29PM -0700, Ian Rogers wrote:
> al->sym may be null given current if conditions and may cause a segv.
> 
> Fixes: cd2bedb7863e9 (perf script: Allow --symbol to accept hexadecimal addresses)

seems it's wrong commit number, I see it under d2bedb7863e9


> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/event.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index dc0e11214ae1..f581550a3015 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -626,7 +626,7 @@ int machine__resolve(struct machine *machine, struct addr_location *al,
>  			ret = strlist__has_entry(symbol_conf.sym_list,
>  						al->sym->name);
>  		}
> -		if (!(ret && al->sym)) {
> +		if (!ret && al->sym) {

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

>  			snprintf(al_addr_str, sz, "0x%"PRIx64,
>  				al->map->unmap_ip(al->map, al->sym->start));
>  			ret = strlist__has_entry(symbol_conf.sym_list,
> -- 
> 2.26.1.301.g55bc3eb7cb9-goog
>