linux-kernel - [PATCH v2] mtd: spi-nor: spansion: make sure local struct does not contain garbage

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Message-ID: <20230509193900.948753-1-tudor.ambarus@linaro.org>
Date:   Tue,  9 May 2023 19:39:00 +0000
From:   Tudor Ambarus <tudor.ambarus@...aro.org>
To:     miquel.raynal@...tlin.com
Cc:     pratyush@...nel.org, michael@...le.cc, richard@....at,
        vigneshr@...com, Takahiro.Kuwano@...ineon.com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        geert@...ux-m68k.org, Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2] mtd: spi-nor: spansion: make sure local struct does not contain garbage

Following errors were seen with um-x86_64-gcc12/um-allyesconfig:
+ /kisskb/src/drivers/mtd/spi-nor/spansion.c: error: 'op' is used uninitialized [-Werror=uninitialized]:  => 495:27, 364:27

Initialise local struct spi_mem_op with all zeros at declaration in
order to avoid using garbage data for fields that are not explicitly
set afterwards.

Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Fixes: c87c9b11c53ce ("mtd: spi-nor: spansion: Determine current address mode")
Fixes: 6afcc84080c41 ("mtd: spi-nor: spansion: Add support for Infineon S25FS256T")
Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
v2:
- init both local vars with all zeros at declaration
- squash patches as the blamed commits were just introduced in this
  merge window.

 drivers/mtd/spi-nor/spansion.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
index 15f9a80c10b9..36876aa849ed 100644
--- a/drivers/mtd/spi-nor/spansion.c
+++ b/drivers/mtd/spi-nor/spansion.c
@@ -361,7 +361,7 @@ static int cypress_nor_determine_addr_mode_by_sr1(struct spi_nor *nor,
  */
 static int cypress_nor_set_addr_mode_nbytes(struct spi_nor *nor)
 {
-	struct spi_mem_op op;
+	struct spi_mem_op op = {};
 	u8 addr_mode;
 	int ret;
 
@@ -492,7 +492,7 @@ s25fs256t_post_bfpt_fixup(struct spi_nor *nor,
 			  const struct sfdp_parameter_header *bfpt_header,
 			  const struct sfdp_bfpt *bfpt)
 {
-	struct spi_mem_op op;
+	struct spi_mem_op op = {};
 	int ret;
 
 	ret = cypress_nor_set_addr_mode_nbytes(nor);
-- 
2.40.1.521.gf1e218fcd8-goog