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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, "huijin.park" <huijin.park@samsung.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Boris Brezillon <boris.brezillon@bootlin.com>,
        Lee Jones <lee.jones@linaro.org>
Subject: [PATCH 4.14 184/209] mtd: spi-nor: cast to u64 to avoid uint overflows
Date:   Wed,  4 Dec 2019 18:56:36 +0100
Message-Id: <20191204175336.157081208@linuxfoundation.org>
In-Reply-To: <20191204175321.609072813@linuxfoundation.org>
References: <20191204175321.609072813@linuxfoundation.org>
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From: huijin.park <huijin.park@samsung.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@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>

---
 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
@@ -2382,7 +2382,7 @@ 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. */