linux-kernel - Re: 2.6.18-mm2 - oops in cache_alloc

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Message-Id: <2006-10-03-17-58-31+trackit+sam@rfc1149.net>
Date:	03 Oct 2006 17:58:31 +0200
From:	Samuel Tardieu <sam@...1149.net>
To:	jt@....hp.com
Cc:	Valdis.Kletnieks@...edu,
	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.18-mm2 - oops in cache_alloc_refill()

>>>>> "Jean" == Jean Tourrilhes <jt@....hp.com> writes:

Jean> @@ -2500,9 +2501,9 @@ static int orinoco_hw_get_essid(struct o
Jean>  	len = le16_to_cpu(essidbuf.len);
Jean>  	BUG_ON(len > IW_ESSID_MAX_SIZE);
Jean>  
Jean> -	memset(buf, 0, IW_ESSID_MAX_SIZE+1);
Jean> +	memset(buf, 0, IW_ESSID_MAX_SIZE);
Jean>  	memcpy(buf, p, len);
Jean> -	buf[len] = '\0';
Jean> +	err = len;

Jean,

something bugs me here:

  - either buf is supposed to be a nul-terminated string, in which
    case if p is IW_ESSID_MAX_SIZE long there may be a bug (no '\0' at
    the end of buf)

  - either buf is not-supposed to be nul-terminated and the length
    value will always be used, in which case the memset() looks
    useless

I suggest that you revert the memset() to IW_ESSID_MAX_SIZE+1 so that
the last byte is cleared as well. Or am I missing something?

 Sam
-- 
Samuel Tardieu -- sam@...1149.net -- http://www.rfc1149.net/

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