linux-kernel - Re: [PATCH][next] scsi: hpsa: fix an uninitialized read and dereference of pointer dev

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Message-ID: <20190523153548.GA112363@archlinux-epyc>
Date:   Thu, 23 May 2019 08:35:48 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Don Brace <don.brace@...rosemi.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        esc.storagedev@...rosemi.com, linux-scsi@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] scsi: hpsa: fix an uninitialized read and
 dereference of pointer dev

On Wed, May 22, 2019 at 09:39:03AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the check for a lockup_detected failure exits via the
> label return_reset_status that reads and dereferences an uninitialized
> pointer dev.  Fix this by ensuring dev is inintialized to null.
> 
> Addresses-Coverity: ("Uninitialized pointer read")
> Fixes: 14991a5bade5 ("scsi: hpsa: correct device resets")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

Clang similarly warns about this, hence my identical submission after
this, sorry for the noise.

> ---
>  drivers/scsi/hpsa.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index c560a4532733..ac8338b0571b 100644
> --- a/drivers/scsi/hpsa.c
> +++ b/drivers/scsi/hpsa.c
> @@ -5947,7 +5947,7 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
>  	int rc = SUCCESS;
>  	int i;
>  	struct ctlr_info *h;
> -	struct hpsa_scsi_dev_t *dev;
> +	struct hpsa_scsi_dev_t *dev = NULL;
>  	u8 reset_type;
>  	char msg[48];
>  	unsigned long flags;
> -- 
> 2.20.1
>