linux-kernel - Re: [PATCH] scsi: myrs: Fix uninitialized variable

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Date:   Thu, 9 May 2019 17:26:42 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     YueHaibing <yuehaibing@...wei.com>, hare@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] scsi: myrs: Fix uninitialized variable

On 5/9/19 5:22 PM, YueHaibing wrote:
> drivers/scsi/myrs.c: In function 'myrs_log_event':
> drivers/scsi/myrs.c:821:24: warning: 'sshdr.sense_key' may be used uninitialized in this function [-Wmaybe-uninitialized]
>    struct scsi_sense_hdr sshdr;
> 
> If ev->ev_code is not 0x1C, sshdr.sense_key may
> be used uninitialized. Fix this by initializing
> variable 'sshdr' to 0.
> 
> Fixes: 77266186397c ("scsi: myrs: Add Mylex RAID controller (SCSI interface)")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>   drivers/scsi/myrs.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/myrs.c b/drivers/scsi/myrs.c
> index b8d54ef..eb0dd56 100644
> --- a/drivers/scsi/myrs.c
> +++ b/drivers/scsi/myrs.c
> @@ -818,7 +818,7 @@ static void myrs_log_event(struct myrs_hba *cs, struct myrs_event *ev)
>   	unsigned char ev_type, *ev_msg;
>   	struct Scsi_Host *shost = cs->host;
>   	struct scsi_device *sdev;
> -	struct scsi_sense_hdr sshdr;
> +	struct scsi_sense_hdr sshdr = {0};
>   	unsigned char sense_info[4];
>   	unsigned char cmd_specific[4];
>   
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke            Teamlead Storage & Networking
hare@...e.de                              +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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