linux-kernel - Re: [PATCH 1/1] platform/chrome: check *dest of memcpy

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Date:   Tue, 17 May 2022 12:23:46 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yuanjun Gong <ruc_gongyuanjun@....com>
Cc:     Benson Leung <bleung@...omium.org>,
        chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 1/1] platform/chrome: check *dest of memcpy

On Tue, May 17, 2022 at 05:55:21PM +0800, Yuanjun Gong wrote:
> From: Gong Yuanjun <ruc_gongyuanjun@....com>
> 
> In regulator/cros-ec-regulator.c, cros_ec_cmd is sometimes called
> with *indata set to NULL.
> 
> static int cros_ec_regulator_enable(struct regulator_dev *dev){
> ...
>      cros_ec_cmd(data->ec_dev, 0, EC_CMD_REGULATOR_ENABLE, &cmd,
> 			  sizeof(cmd), NULL, 0)
> ...}
> 
> Don't do memcpy if indata is NULL.
> 
> Signed-off-by: Gong Yuanjun <ruc_gongyuanjun@....com>
> ---
>  drivers/platform/chrome/cros_ec_proto.c | 2 +-
>  drivers/regulator/cros-ec-regulator.c   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index c4caf2e2de82..da175c57cff7 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -938,7 +938,7 @@ int cros_ec_command(struct cros_ec_device *ec_dev,
>  	if (ret < 0)
>  		goto error;
>  
> -	if (insize)
> +	if (indata && insize)
>  		memcpy(indata, msg->data, insize);
>  error:
>  	kfree(msg);
> diff --git a/drivers/regulator/cros-ec-regulator.c b/drivers/regulator/cros-ec-regulator.c
> index c4754f3cf233..1c7ff085e492 100644
> --- a/drivers/regulator/cros-ec-regulator.c
> +++ b/drivers/regulator/cros-ec-regulator.c
> @@ -44,7 +44,7 @@ static int cros_ec_cmd(struct cros_ec_device *ec, u32 version, u32 command,
>  	if (ret < 0)
>  		goto cleanup;
>  
> -	if (insize)
> +	if (indata && insize)
>  		memcpy(indata, msg->data, insize);
>  
>  cleanup:
> -- 
> 2.17.1
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>