[PATCH][next] mtd: devices: mchp48l640: Fix return of uninitialized value in ret

[PATCH][next] mtd: devices: mchp48l640: Fix return of uninitialized value in ret

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

In the case where the read or write lengths are zero bytes the return
value in variable ret has not been initialized and a garbage value
is returned. Fix this by initializing ret to zero.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 88d125026753 ("mtd: devices: add support for microchip 48l640 EERAM")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/mtd/devices/mchp48l640.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/devices/mchp48l640.c b/drivers/mtd/devices/mchp48l640.c
index efc2003bd13a..0833f41e9d17 100644
--- a/drivers/mtd/devices/mchp48l640.c
+++ b/drivers/mtd/devices/mchp48l640.c
@@ -210,7 +210,7 @@ static int mchp48l640_write(struct mtd_info *mtd, loff_t to, size_t len,
 			    size_t *retlen, const unsigned char *buf)
 {
 	struct mchp48l640_flash *flash = to_mchp48l640_flash(mtd);
-	int ret;
+	int ret = 0;
 	size_t wlen = 0;
 	loff_t woff = to;
 	size_t ws;
@@ -267,7 +267,7 @@ static int mchp48l640_read(struct mtd_info *mtd, loff_t from, size_t len,
 			   size_t *retlen, unsigned char *buf)
 {
 	struct mchp48l640_flash *flash = to_mchp48l640_flash(mtd);
-	int ret;
+	int ret = 0;
 	size_t wlen = 0;
 	loff_t woff = from;
 	size_t ws;
-- 
2.31.1

Re: [PATCH][next] mtd: devices: mchp48l640: Fix return of uninitialized value in ret

[Heiko Schocher]

Hello Colin,

On 15.06.21 16:06, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> In the case where the read or write lengths are zero bytes the return
> value in variable ret has not been initialized and a garbage value
> is returned. Fix this by initializing ret to zero.
> 
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: 88d125026753 ("mtd: devices: add support for microchip 48l640 EERAM")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  drivers/mtd/devices/mchp48l640.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Thanks!

Reviewed-by: Heiko Schocher <hs@denx.de>

bye,
Heiko
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