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

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Date:   Thu, 23 May 2019 15:25:48 +0000
From:   <Don.Brace@...rochip.com>
To:     <colin.king@...onical.com>, <don.brace@...rosemi.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <esc.storagedev@...rosemi.com>, <linux-scsi@...r.kernel.org>
CC:     <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

----Original Message-----
From: linux-scsi-owner@...r.kernel.org [mailto:linux-scsi-owner@...r.kernel.org] On Behalf Of Colin King
Sent: Wednesday, May 22, 2019 3:39 AM
To: 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
Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: [PATCH][next] scsi: hpsa: fix an uninitialized read and dereference of pointer dev

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>

I sent up a similar patch on 5/16, but this is just as good.
Acked-by: Don Brace <don.brace@...rosemi.com>

Thanks for your patch.

---
 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