linux-kernel - [PATCH 4.14 57/71] mtd: spi-nor: fix silent truncation in spi_nor_read

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Date:   Fri, 17 Jan 2020 00:18:55 +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,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH 4.14 57/71] mtd: spi-nor: fix silent truncation in spi_nor_read_raw()

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

commit 3d63ee5deb466fd66ed6ffb164a87ce36425cf36 upstream.

spi_nor_read_raw() assigns the result of 'ssize_t spi_nor_read_data()'
to the 'int ret' variable, while 'ssize_t' is a 64-bit type and *int*
is a 32-bit type on the 64-bit machines. This silent truncation isn't
really valid, so fix up the variable's type.

Fixes: f384b352cbf0 ("mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
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
@@ -1445,7 +1445,7 @@ static int macronix_quad_enable(struct s
  */
 static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)
 {
-	int ret;
+	ssize_t ret;
 
 	write_enable(nor);