linux-kernel - [PATCH 4.19 300/321] mtd: spi-nor: cast to u64 to avoid uint overflows

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Message-Id: <20191203223442.757758877@linuxfoundation.org>
Date:   Tue,  3 Dec 2019 23:36:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "huijin.park" <huijin.park@...sung.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 4.19 300/321] mtd: spi-nor: cast to u64 to avoid uint overflows

From: huijin.park <huijin.park@...sung.com>

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@...sung.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Boris Brezillon <boris.brezillon@...tlin.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/spi-nor/spi-nor.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2459,7 +2459,7 @@ static int spi_nor_init_params(struct sp
 	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. */