linux-kernel - Re: [PATCH] nfsd: wrong index used in inner loop

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Message-ID: <20110309004955.GD15814@fieldses.org>
Date:	Tue, 8 Mar 2011 19:49:55 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	roel <roel.kluin@...il.com>
Cc:	Neil Brown <neilb@...e.de>, linux-nfs@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nfsd: wrong index used in inner loop

On Tue, Mar 08, 2011 at 10:32:26PM +0100, roel wrote:
> Index i was already used in the outer loop
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
>  fs/nfsd/nfs4xdr.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> Not 100% sure this one is needed but it looks suspicious.

Looks bad to me, thanks.

nfsd4_decode_create_session should probably really be broken up a little
bit; if it wasn't so long this would have been more obvious.

I'll see if I can slip this into 2.6.38 with a couple other last-minute
patches....  Otherwise, it'll be in 2.6.39.

--b.

> 
> diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> index 1275b86..615f0a9 100644
> --- a/fs/nfsd/nfs4xdr.c
> +++ b/fs/nfsd/nfs4xdr.c
> @@ -1142,7 +1142,7 @@ nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
>  
>  	u32 dummy;
>  	char *machine_name;
> -	int i;
> +	int i, j;
>  	int nr_secflavs;
>  
>  	READ_BUF(16);
> @@ -1215,7 +1215,7 @@ nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
>  			READ_BUF(4);
>  			READ32(dummy);
>  			READ_BUF(dummy * 4);
> -			for (i = 0; i < dummy; ++i)
> +			for (j = 0; j < dummy; ++j)
>  				READ32(dummy);
>  			break;
>  		case RPC_AUTH_GSS:
--
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