linux-kernel - [PATCH v1 2/3] misc: at25: Don't copy garbage to the at25->chip in FRAM case

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Date:   Thu, 25 Nov 2021 23:27:28 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Prchal <jiri.prchal@...ignal.cz>
Subject: [PATCH v1 2/3] misc: at25: Don't copy garbage to the at25->chip in FRAM case

Even if we know that we are going to fill everything later on
it's bad style and fragile to copy garbage from the stack to
the data structure that will be used in the driver.

Fixes: fd307a4ad332 ("nvmem: prepare basics for FRAM support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/misc/eeprom/at25.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c
index 57599eac2f71..f0b0efc30ee6 100644
--- a/drivers/misc/eeprom/at25.c
+++ b/drivers/misc/eeprom/at25.c
@@ -390,7 +390,10 @@ static int at25_probe(struct spi_device *spi)
 
 	/* Chip description */
 	if (!spi->dev.platform_data) {
-		if (!is_fram) {
+		if (is_fram) {
+			/* We file fields for FRAM case later on */
+			memset(&chip, 0, sizeof(chip));
+		} else {
 			err = at25_fw_to_chip(&spi->dev, &chip);
 			if (err)
 				return err;
-- 
2.33.0