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

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Date:	Thu, 14 Apr 2016 12:39:17 +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] 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.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 8eaed05..f3c994f 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -513,7 +513,8 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg)
 	struct alua_port_group *tmp_pg;
 	int len, k, off, valid_states = 0, bufflen = ALUA_RTPG_SIZE;
 	unsigned char *desc, *buff;
-	unsigned err, retval;
+	unsigned int err = 0;
+	unsigned int retval;
 	unsigned int tpg_desc_tbl_off;
 	unsigned char orig_transition_tmo;
 	unsigned long flags;