| Message ID | 20231128150839.2605003-1-f.suligoi@asem.it (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | backlight: mp3309c: fix uninitialized local variable | expand |
On Tue, Nov 28, 2023 at 04:08:39PM +0100, Flavio Suligoi wrote: > In the function "pm3309c_parse_dt_node", when the dimming analog control > mode (by I2C messages) is enabled, the local variable "prop_levels" is > tested without any initialization, as indicated by the following smatch > warning (thanks to Dan Carpenter for the report): Good to see credit for the reporter but please use a "Reported-by:" tag for that. There should probably be a "Fixed:" tag too. > drivers/video/backlight/mp3309c.c:279 pm3309c_parse_dt_node() error: uninitialized symbol 'prop_levels'. > > To avoid any problem in case of undefined behavior, we need to initialize > it to "NULL". > For consistency, I also initialize the other similar variable > "prop_pwms" in the same way. I don't love redundant initializations... but I can live with it ;-) . Daniel.
diff --git a/drivers/video/backlight/mp3309c.c b/drivers/video/backlight/mp3309c.c index 3fe4469ef43f..733cad1dd15c 100644 --- a/drivers/video/backlight/mp3309c.c +++ b/drivers/video/backlight/mp3309c.c @@ -203,7 +203,8 @@ static int pm3309c_parse_dt_node(struct mp3309c_chip *chip, struct mp3309c_platform_data *pdata) { struct device_node *node = chip->dev->of_node; - struct property *prop_pwms, *prop_levels; + struct property *prop_pwms = NULL; + struct property *prop_levels = NULL; int length = 0; int ret, i; unsigned int num_levels, tmp_value;
In the function "pm3309c_parse_dt_node", when the dimming analog control mode (by I2C messages) is enabled, the local variable "prop_levels" is tested without any initialization, as indicated by the following smatch warning (thanks to Dan Carpenter for the report): drivers/video/backlight/mp3309c.c:279 pm3309c_parse_dt_node() error: uninitialized symbol 'prop_levels'. To avoid any problem in case of undefined behavior, we need to initialize it to "NULL". For consistency, I also initialize the other similar variable "prop_pwms" in the same way. Signed-off-by: Flavio Suligoi <f.suligoi@asem.it> --- drivers/video/backlight/mp3309c.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)