linux-kernel - [PATCH 2/4] mtd: spi-nor: micron-st: make op does not contain garbage

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Message-Id: <20230717163600.29087-2-tudor.ambarus@linaro.org>
Date:   Mon, 17 Jul 2023 19:35:58 +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 2/4] mtd: spi-nor: micron-st: make 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: ad624dfd7bb6 ("mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode")
Cc: stable@...r.kernel.org
Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/mtd/spi-nor/micron-st.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
index f79e71d99124..8390ed6a47b6 100644
--- a/drivers/mtd/spi-nor/micron-st.c
+++ b/drivers/mtd/spi-nor/micron-st.c
@@ -49,7 +49,7 @@
 
 static int micron_st_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;
@@ -64,6 +64,7 @@ static int micron_st_nor_octal_dtr_en(struct spi_nor *nor)
 		return ret;
 
 	buf[0] = SPINOR_MT_OCT_DTR;
+	memset(&op, 0, sizeof(op));
 	op = (struct spi_mem_op)
 		MICRON_ST_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
 					    SPINOR_REG_MT_CFR0V, 1, buf);
@@ -86,7 +87,7 @@ static int micron_st_nor_octal_dtr_en(struct spi_nor *nor)
 
 static int micron_st_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