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

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Message-ID: <a7afa46d-0478-34a3-d037-c40aca3445c7@linaro.org>
Date:   Tue, 21 Sep 2021 11:39:47 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Jeya R <jeyr@...eaurora.org>, linux-arm-msm@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        fastrpc.upstream@....qualcomm.com
Subject: Re: [PATCH] misc: fastrpc: fix improper packet size calculation

Hi Jeya,

Can you make sure the subject line reflects the patch version that you 
are sending.
In this case it should be "[PATCH v2] misc: fastrpc: fix improper packet 
size calculation"

this will help reviewers and maintainers to differentiate the versions 
of patch.

On 21/09/2021 11:35, 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>
> ---

Please add changes done from v1 to v2 here.

something like:

Changes from v1:
- bla bla bla..


>   drivers/misc/fastrpc.c | 13 +++++++++----
>   1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index beda610..a7e550f 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -719,16 +719,21 @@ 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 = 0;

Looks like you missed to address my previous comments.

--srini
>   
>   	size = ALIGN(metalen, FASTRPC_ALIGN);
> -	for (i = 0; i < ctx->nscalars; i++) {
> +	for (oix = 0; oix < ctx->nbufs; oix++) {
> +		int i = ctx->olaps[oix].raix;
> +
> +		if (ctx->args[i].length == 0)
> +			continue;
> +
>   		if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
>   
> -			if (ctx->olaps[i].offset == 0)
> +			if (ctx->olaps[oix].offset == 0)
>   				size = ALIGN(size, FASTRPC_ALIGN);
>   
> -			size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
> +			size += (ctx->olaps[oix].mend - ctx->olaps[oix].mstart);
>   		}
>   	}
>   
>