linux-kernel - Re: [PATCH] blktrace: pass the right pointer to kfree()

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Message-ID: <20090409131310.GC24946@ghostprotocols.net>
Date:	Thu, 9 Apr 2009 10:13:10 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] blktrace: pass the right pointer to kfree()

Em Thu, Apr 09, 2009 at 11:19:40AM +0800, Li Zefan escreveu:
> If passing a string with leading white spaces to strstrip(),
> the returned ptr != the original ptr.
> 
> This bug was introduced by me.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>

I hadn't noticed that strstrip was added, oops.

Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>

> ---
>  kernel/trace/blktrace.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index b32ff44..921ef5d 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -1377,12 +1377,12 @@ static int blk_trace_str2mask(const char *str)
>  {
>  	int i;
>  	int mask = 0;
> -	char *s, *token;
> +	char *buf, *s, *token;
>  
> -	s = kstrdup(str, GFP_KERNEL);
> -	if (s == NULL)
> +	buf = kstrdup(str, GFP_KERNEL);
> +	if (buf == NULL)
>  		return -ENOMEM;
> -	s = strstrip(s);
> +	s = strstrip(buf);
>  
>  	while (1) {
>  		token = strsep(&s, ",");
> @@ -1403,7 +1403,7 @@ static int blk_trace_str2mask(const char *str)
>  			break;
>  		}
>  	}
> -	kfree(s);
> +	kfree(buf);
>  
>  	return mask;
>  }
> -- 
> 1.5.4.rc3
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