linux-kernel - [PATCH 3/4] mtd: spi-nor: spansion: make sure op does not contain garbage

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Message-Id: <20230717163600.29087-3-tudor.ambarus@linaro.org>
Date:   Mon, 17 Jul 2023 19:35:59 +0300
From:   Tudor Ambarus <tudor.ambarus@...aro.org>
To:     michael@...le.cc, pratyush@...nel.org
Cc:     miquel.raynal@...tlin.com, ichard@....at,
        Takahiro.Kuwano@...ineon.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Tudor Ambarus <tudor.ambarus@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH 3/4] mtd: spi-nor: spansion: make sure op does not contain garbage

Initialise local struct spi_mem_op with all zeros at declaration,
or by memset before the second use, in order to avoid using garbage
data for fields that are not explicitly set afterwards.

Fixes: c3266af101f2 ("mtd: spi-nor: spansion: add support for Cypress Semper flash")
Cc: stable@...r.kernel.org
Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/mtd/spi-nor/spansion.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
index 6d6466a3436e..c03445e46d56 100644
--- a/drivers/mtd/spi-nor/spansion.c
+++ b/drivers/mtd/spi-nor/spansion.c
@@ -143,7 +143,7 @@ static int cypress_nor_sr_ready_and_clear(struct spi_nor *nor)
 
 static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
 {
-	struct spi_mem_op op;
+	struct spi_mem_op op = {};
 	u8 *buf = nor->bouncebuf;
 	int ret;
 	u8 addr_mode_nbytes = nor->params->addr_mode_nbytes;
@@ -161,6 +161,7 @@ static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
 	nor->read_dummy = 24;
 
 	/* Set the octal and DTR enable bits. */
+	memset(&op, 0, sizeof(op));
 	buf[0] = SPINOR_REG_CYPRESS_CFR5_OCT_DTR_EN;
 	op = (struct spi_mem_op)
 		CYPRESS_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
@@ -186,7 +187,7 @@ static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
 
 static int cypress_nor_octal_dtr_dis(struct spi_nor *nor)
 {
-	struct spi_mem_op op;
+	struct spi_mem_op op = {};
 	u8 *buf = nor->bouncebuf;
 	int ret;
 
-- 
2.34.1