linux-kernel - Re: [PATCH] rpmsg: glink: initialize ret to zero to ensure error status check is correct

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Message-ID: <20170904175333.GI20643@builder>
Date:   Mon, 4 Sep 2017 10:53:33 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>, linux-remoteproc@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rpmsg: glink: initialize ret to zero to ensure error
 status check is correct

On Sun 03 Sep 06:06 PDT 2017, Colin King wrote:

> From: Colin Ian King <colin.king@...onical.com>
> 
> The new switch cases for RPM_CMD_RX_DONE, RPM_CMD_RX_DONE_W_REUSE,
> RPM_CMD_RX_INTENT_REQ_ACK, RPM_CMD_INTENT and RPM_CMD_RX_INTENT_REQ from
> 4 recent commits are not setting ret and so a later non-zero check on ret
> is testing on a garbage value in ret. Fix this by initializing ret to zero.
> 
> Detected by CoverityScan CID#1455249 ("Uninitialized scalar variable")
> 
> Fixes: 933b45da5d1d ("rpmsg: glink: Add support for TX intents)
> Fixes: dacbb35e930f ("glink: Receive and store the remote intent buffers")
> Fixes: 27b9c5b66b23 ("rpmsg: glink: Request for intents when unavailable")
> Fixes: 88c6060f5a7f ("rpmsg: glink: Handle remote rx done command")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thanks Colin, applied both patches.

Regards,
Bjorn

> ---
>  drivers/rpmsg/qcom_glink_native.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
> index 8bc0d0456a40..5a5e927ea50f 100644
> --- a/drivers/rpmsg/qcom_glink_native.c
> +++ b/drivers/rpmsg/qcom_glink_native.c
> @@ -957,7 +957,7 @@ static irqreturn_t qcom_glink_native_intr(int irq, void *data)
>  	unsigned int param2;
>  	unsigned int avail;
>  	unsigned int cmd;
> -	int ret;
> +	int ret = 0;
>  
>  	for (;;) {
>  		avail = qcom_glink_rx_avail(glink);
> @@ -994,8 +994,6 @@ static irqreturn_t qcom_glink_native_intr(int irq, void *data)
>  
>  			mbox_send_message(glink->mbox_chan, NULL);
>  			mbox_client_txdone(glink->mbox_chan, 0);
> -
> -			ret = 0;
>  			break;
>  		case RPM_CMD_INTENT:
>  			qcom_glink_handle_intent(glink, param1, param2, avail);
> -- 
> 2.14.1
>