linux-kernel - [patch v2] scsi_dh_alua: uninitialized variable in alua

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Message-ID: <20160414182034.GA32469@mwanda>
Date:	Thu, 14 Apr 2016 21:20:34 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Hannes Reinecke <hare@...e.de>,
	Bart Van Assche <bart.vanassche@...disk.com>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	Ewan Milne <emilne@...hat.com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch v2] scsi_dh_alua: uninitialized variable in alua_rtpg()

It's possible to use "err" without initializing it.  If it happens to be
a 2 which is SCSI_DH_RETRY then that could cause a bug.  Bart Van Assche
pointed out that we should probably re-initialize it for every iteration
through the retry loop.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: The first version just initialized it at the start of the function.

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 8eaed05..a655cf2 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -532,6 +532,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg)
 		return SCSI_DH_DEV_TEMP_BUSY;
 
  retry:
+	err = 0;
 	retval = submit_rtpg(sdev, buff, bufflen, &sense_hdr, pg->flags);
 
 	if (retval) {