linux-kernel - [PATCH 4/4] mtd: spi-nor: spansion: make sure op does not contain garbage (2)

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Message-Id: <20230717163600.29087-4-tudor.ambarus@linaro.org>
Date:   Mon, 17 Jul 2023 19:36:00 +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 4/4] mtd: spi-nor: spansion: make sure op does not contain garbage (2)

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: b6b23833fc42 ("mtd: spi-nor: spansion: Add s25hl-t/s25hs-t IDs and fixups")
Cc: stable@...r.kernel.org
Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/mtd/spi-nor/spansion.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
index c03445e46d56..7485b708158f 100644
--- a/drivers/mtd/spi-nor/spansion.c
+++ b/drivers/mtd/spi-nor/spansion.c
@@ -220,7 +220,7 @@ static int cypress_nor_octal_dtr_dis(struct spi_nor *nor)
 
 static int cypress_nor_quad_enable_volatile_reg(struct spi_nor *nor, u64 addr)
 {
-	struct spi_mem_op op;
+	struct spi_mem_op op = {};
 	u8 addr_mode_nbytes = nor->params->addr_mode_nbytes;
 	u8 cfr1v_written;
 	int ret;
@@ -237,6 +237,7 @@ static int cypress_nor_quad_enable_volatile_reg(struct spi_nor *nor, u64 addr)
 		return 0;
 
 	/* Update the Quad Enable bit. */
+	memset(&op, 0, sizeof(op));
 	nor->bouncebuf[0] |= SPINOR_REG_CYPRESS_CFR1_QUAD_EN;
 	op = (struct spi_mem_op)
 		CYPRESS_NOR_WR_ANY_REG_OP(addr_mode_nbytes, addr, 1,
@@ -248,6 +249,7 @@ static int cypress_nor_quad_enable_volatile_reg(struct spi_nor *nor, u64 addr)
 	cfr1v_written = nor->bouncebuf[0];
 
 	/* Read back and check it. */
+	memset(&op, 0, sizeof(op));
 	op = (struct spi_mem_op)
 		CYPRESS_NOR_RD_ANY_REG_OP(addr_mode_nbytes, addr, 0,
 					  nor->bouncebuf);
-- 
2.34.1