linux-kernel - Re: [PATCH] xprtrdma: fix incorrect header size calcations

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Date:   Wed, 15 Jul 2020 17:31:33 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xprtrdma: fix incorrect header size calcations

Bah, $SUBJECT typo "calcations" -> "calculations". can that be fixed up
when it's applied, or shall I send a V2?

On 15/07/2020 17:26, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the header size calculations are using an assignment
> operator instead of a += operator when accumulating the header
> size leading to incorrect sizes.  Fix this by using the correct
> operator.
> 
> Addresses-Coverity: ("Unused value")
> Fixes: 302d3deb2068 ("xprtrdma: Prevent inline overflow")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  net/sunrpc/xprtrdma/rpc_rdma.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
> index 935bbef2f7be..453bacc99907 100644
> --- a/net/sunrpc/xprtrdma/rpc_rdma.c
> +++ b/net/sunrpc/xprtrdma/rpc_rdma.c
> @@ -71,7 +71,7 @@ static unsigned int rpcrdma_max_call_header_size(unsigned int maxsegs)
>  	size = RPCRDMA_HDRLEN_MIN;
>  
>  	/* Maximum Read list size */
> -	size = maxsegs * rpcrdma_readchunk_maxsz * sizeof(__be32);
> +	size += maxsegs * rpcrdma_readchunk_maxsz * sizeof(__be32);
>  
>  	/* Minimal Read chunk size */
>  	size += sizeof(__be32);	/* segment count */
> @@ -94,7 +94,7 @@ static unsigned int rpcrdma_max_reply_header_size(unsigned int maxsegs)
>  	size = RPCRDMA_HDRLEN_MIN;
>  
>  	/* Maximum Write list size */
> -	size = sizeof(__be32);		/* segment count */
> +	size += sizeof(__be32);		/* segment count */
>  	size += maxsegs * rpcrdma_segment_maxsz * sizeof(__be32);
>  	size += sizeof(__be32);	/* list discriminator */
>  
>