linux-kernel - Re: [PATCH v3] misc: fastrpc: fix improper packet size calculation

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Date:   Tue, 21 Sep 2021 13:52:14 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jeya R <jeyr@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, srinivas.kandagatla@...aro.org,
        linux-kernel@...r.kernel.org, fastrpc.upstream@....qualcomm.com
Subject: Re: [PATCH v3] misc: fastrpc: fix improper packet size calculation

On Tue, Sep 21, 2021 at 05:18:15PM +0530, Jeya R wrote:
> The buffer list is sorted and this is not being considered while
> calculating packet size. This would lead to improper copy length
> calculation for non-dmaheap buffers which would eventually cause
> sending improper buffers to DSP.
> 
> Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method")
> Signed-off-by: Jeya R <jeyr@...eaurora.org>
> Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

Does this also need to go to the stable kernels?

> ---
> Changes in v3:
> - relocate patch change list
> 
> Changes in v2:
> - updated commit message to proper format
> - added fixes tag to commit message
> - removed unnecessary variable initialization
> - removed length check during payload calculation
> 
>  drivers/misc/fastrpc.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index beda610..69d45c4 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -719,16 +719,18 @@ static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
>  static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
>  {
>  	u64 size = 0;
> -	int i;
> +	int oix;

What does "oix" stand for?  What was wrong with i?

thanks,

greg k-h