From: huijin.park <huijin.park@samsung.com>
Date: Wed, 28 Nov 2018 08:02:14 +0000 (-0500)
Subject: mtd: spi-nor: cast to u64 to avoid uint overflows
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=87b4ed6c62132663689f553ba506bfe5891c0f2e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

mtd: spi-nor: cast to u64 to avoid uint overflows

commit 84a1c2109d23df3543d96231c4fee1757299bb1a upstream.

The "params->size" is defined as "u64".
And "info->sector_size" and "info->n_sectors" are defined as
unsigned int and u16.
Thus, u64 data might have strange data(loss data) if the result
overflows an unsigned int.
This patch casts "info->sector_size" to an u64.

Signed-off-by: huijin.park <huijin.park@samsung.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 6c013341ef09..d550148177a0 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2382,7 +2382,7 @@ static int spi_nor_init_params(struct spi_nor *nor,
 	memset(params, 0, sizeof(*params));
 
 	/* Set SPI NOR sizes. */
-	params->size = info->sector_size * info->n_sectors;
+	params->size = (u64)info->sector_size * info->n_sectors;
 	params->page_size = info->page_size;
 
 	/* (Fast) Read settings. */