linux-kernel - Re: [PATCH 2/3] perf dlfilter: Initialize addr_location before passing it to thread__find_symbol

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Date:   Mon, 31 Jul 2023 12:30:00 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 2/3] perf dlfilter: Initialize addr_location before
 passing it to thread__find_symbol_fb()

On 31/07/23 12:18, Adrian Hunter wrote:
> From: Arnaldo Carvalho de Melo <acme@...nel.org>

Or should that and below be acme@...hat.com

> 
> As thread__find_symbol_fb() will end up calling thread__find_map() and
> it in turn will call these on uninitialized memory:
> 
>         maps__zput(al->maps);
>         map__zput(al->map);
>         thread__zput(al->thread);
> 
> Fixes: 0dd5041c9a0e ("perf addr_location: Add init/exit/copy functions")
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Cc: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> Cc: Disha Goel <disgoel@...ux.vnet.ibm.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Kajol Jain <kjain@...ux.ibm.com>
> Cc: Madhavan Srinivasan <maddy@...ux.ibm.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Link: https://lore.kernel.org/lkml/
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...nel.org>
> ---
>  tools/perf/util/dlfilter.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/dlfilter.c b/tools/perf/util/dlfilter.c
> index 46f74b2344db..798a53d7e6c9 100644
> --- a/tools/perf/util/dlfilter.c
> +++ b/tools/perf/util/dlfilter.c
> @@ -166,6 +166,7 @@ static __s32 dlfilter__resolve_address(void *ctx, __u64 address, struct perf_dlf
>  	if (!thread)
>  		return -1;
>  
> +	addr_location__init(&al);
>  	thread__find_symbol_fb(thread, d->sample->cpumode, address, &al);
>  
>  	al_to_d_al(&al, &d_al);