linux-kernel - Re: [PATCH] perf top: fix crash on annotate request

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Message-ID: <20111019183848.GE2229@ghostprotocols.net>
Date:	Wed, 19 Oct 2011 16:38:48 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, peterz@...radead.org,
	fweisbec@...il.com
Subject: Re: [PATCH] perf top: fix crash on annotate request

Em Wed, Oct 19, 2011 at 12:23:18PM -0600, David Ahern escreveu:
> Hitting an annotate case where src is not set and
> perf-top crashes.

How did you got there? Navigating thru callq? I  wonder if in this case
we'd instead shouldn't call

symbol__alloc_hist(sym, evlist->nr_entries)

And proceed, only complaining on ENOMEM, like we do in parse_source in
builtin-top.c.

I.e. if the user asked to go to a function without hits, no problem,
allocate the data structures needed for doing the annotation and show 0
hits on all lines.

- Arnaldo
 
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  tools/perf/util/annotate.c             |    3 +++
>  tools/perf/util/ui/browsers/annotate.c |    2 ++
>  2 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index bc8f477..26652b1 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -205,6 +205,9 @@ static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
>  	size_t line_len;
>  	s64 line_ip, offset = -1;
>  
> +	if (!notes->src)
> +		return -1;
> +
>  	if (getline(&line, &line_len, file) < 0)
>  		return -1;
>  
> diff --git a/tools/perf/util/ui/browsers/annotate.c b/tools/perf/util/ui/browsers/annotate.c
> index a2c351c..5a67ead 100644
> --- a/tools/perf/util/ui/browsers/annotate.c
> +++ b/tools/perf/util/ui/browsers/annotate.c
> @@ -410,6 +410,8 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
>  	ui_helpline__push("Press <- or ESC to exit");
>  
>  	notes = symbol__annotation(sym);
> +	if (!notes->src)
> +		return -1;
>  
>  	list_for_each_entry(pos, &notes->src->source, node) {
>  		struct objdump_line_rb_node *rbpos;
> -- 
> 1.7.6.4
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