linux-kernel - [PATCH 4.4 20/44] pata_legacy: fix a couple uninitialized variable bugs

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Message-Id: <20211025190932.807136321@linuxfoundation.org>
Date:   Mon, 25 Oct 2021 21:14:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Damien Le Moal <damien.lemoal@....com>
Subject: [PATCH 4.4 20/44] pata_legacy: fix a couple uninitialized variable bugs

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 013923477cb311293df9079332cf8b806ed0e6f2 upstream.

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>
Signed-off-by: Damien Le Moal <damien.lemoal@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/ata/pata_legacy.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/ata/pata_legacy.c
+++ b/drivers/ata/pata_legacy.c
@@ -328,7 +328,8 @@ static unsigned int pdc_data_xfer_vlb(st
 			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);
@@ -716,7 +717,8 @@ static unsigned int vlb32_data_xfer(stru
 			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);