linux-kernel - Re: [Perf bug-fix] check null of sym pointer before using it

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Date:	Mon, 11 Jun 2012 10:07:10 +0800
From:	Shan Wei <shanwei88@...il.com>
To:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...stprotocols.net, namhyung.kim@....com,
	Kernel-Maillist <linux-kernel@...r.kernel.org>
CC:	Samuel Liao <samuelliao@...cent.com>
Subject: Re: [Perf bug-fix] check null of sym pointer before using it


ping.....

It's a obvious function bug.....

Shan Wei said, at 2012/6/5 13:14:

> From: Samuel Liao <samuelliao@...cent.com>
> 
> Sometimes, sym will be null that causing perf crash.
> 
> Signed-off-by: Shan Wei <davidshan@...cent.com>
> ---
>  tools/perf/ui/browsers/annotate.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
> index 4deea6a..50873a8 100644
> --- a/tools/perf/ui/browsers/annotate.c
> +++ b/tools/perf/ui/browsers/annotate.c
> @@ -814,7 +814,7 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
>  {
>  	struct disasm_line *pos, *n;
>  	struct annotation *notes;
> -	const size_t size = symbol__size(sym);
> +	size_t size;
>  	struct map_symbol ms = {
>  		.map = map,
>  		.sym = sym,
> @@ -834,6 +834,8 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
>  	if (sym == NULL)
>  		return -1;
>  
> +	size = symbol__size(sym);
> +
>  	if (map->dso->annotate_warned)
>  		return -1;
>  


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