releases/5.4.289/mtd-diskonchip-cast-an-operand-to-prevent-potential-overflow.patch

From 9b458e8be0d13e81ed03fffa23f8f9b528bbd786 Mon Sep 17 00:00:00 2001
From: Zichen Xie <zichenxie0106@gmail.com>
Date: Wed, 23 Oct 2024 16:13:10 -0500
Subject: mtd: diskonchip: Cast an operand to prevent potential overflow

From: Zichen Xie <zichenxie0106@gmail.com>

commit 9b458e8be0d13e81ed03fffa23f8f9b528bbd786 upstream.

There may be a potential integer overflow issue in inftl_partscan().
parts[0].size is defined as "uint64_t"  while mtd->erasesize and
ip->firstUnit are defined as 32-bit unsigned integer. The result of
the calculation will be limited to 32 bits without correct casting.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Zichen Xie <zichenxie0106@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/mtd/nand/raw/diskonchip.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -1221,7 +1221,7 @@ static inline int __init inftl_partscan(
 		    (i == 0) && (ip->firstUnit > 0)) {
 			parts[0].name = " DiskOnChip IPL / Media Header partition";
 			parts[0].offset = 0;
-			parts[0].size = mtd->erasesize * ip->firstUnit;
+			parts[0].size = (uint64_t)mtd->erasesize * ip->firstUnit;
 			numparts = 1;
 		}