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[v3] mtd: diskonchip: Cast an operand to prevent potential overflow

Message ID 20241023210452.12677-1-zichenxie0106@gmail.com
State New
Headers show
Series [v3] mtd: diskonchip: Cast an operand to prevent potential overflow | expand

Commit Message

Gax-c Oct. 23, 2024, 9:04 p.m. UTC 
From: Zichen Xie <zichenxie0106@gmail.com>

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>
---
v2: Correct "Fixes" tag.
v3: Shorten subject and adjust commit log wrapping.
---
 drivers/mtd/nand/raw/diskonchip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c
index 8db7fc424571..70d6c2250f32 100644
--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -1098,7 +1098,7 @@  static inline int __init inftl_partscan(struct mtd_info *mtd, struct mtd_partiti
 		    (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;
 		}