linux-kernel - [PATCH] pata_legacy: fix a couple uninitialized variable bugs

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Message-ID: <20211006073419.GC8404@kili>
Date:   Wed, 6 Oct 2021 10:34:19 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     Tejun Heo <htejun@...il.com>, Jeff Garzik <jeff@...zik.org>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] pata_legacy: fix a couple uninitialized variable bugs

The last byte of "pad" is used without being initialized.

Fixes: 55dba3120fbc ("libata: update ->data_xfer hook for ATAPI")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/ata/pata_legacy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/pata_legacy.c b/drivers/ata/pata_legacy.c
index c3e6592712c4..b53f0e09783d 100644
--- a/drivers/ata/pata_legacy.c
+++ b/drivers/ata/pata_legacy.c
@@ -352,7 +352,7 @@ static unsigned int pdc_data_xfer_vlb(struct ata_queued_cmd *qc,
 			iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 
 		if (unlikely(slop)) {
-			__le32 pad;
+			__le32 pad = 0;
 			if (rw == READ) {
 				pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
 				memcpy(buf + buflen - slop, &pad, slop);
@@ -742,7 +742,7 @@ static unsigned int vlb32_data_xfer(struct ata_queued_cmd *qc,
 			ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 
 		if (unlikely(slop)) {
-			__le32 pad;
+			__le32 pad = 0;
 			if (rw == WRITE) {
 				memcpy(&pad, buf + buflen - slop, slop);
 				iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
-- 
2.20.1