[stable 4.19+][PATCH 14/20] pinctrl: stm32: fix memory leak issue

From: Mathieu Poirier
Date: Fri Nov 15 2019 - 17:34:12 EST


From: Alexandre Torgue <alexandre.torgue@xxxxxx>

commit cd8c9b5a49576bf28990237715bc2cb2210ac80a upstream

configs is allocated by pinconf_generic_parse_dt_config(),
pinctrl_utils_add_map_configs() duplicates configs so it can and has to
be freed to prevent memory leaks.

Signed-off-by: Alexandre Torgue <alexandre.torgue@xxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.19+
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
---
drivers/pinctrl/stm32/pinctrl-stm32.c | 26 ++++++++++++++++----------
1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index a9bec6e6fdd1..14dfbbd6c1c3 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -410,7 +410,7 @@ static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
unsigned int num_configs;
bool has_config = 0;
unsigned reserve = 0;
- int num_pins, num_funcs, maps_per_pin, i, err;
+ int num_pins, num_funcs, maps_per_pin, i, err = 0;

pctl = pinctrl_dev_get_drvdata(pctldev);

@@ -437,41 +437,45 @@ static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
if (has_config && num_pins >= 1)
maps_per_pin++;

- if (!num_pins || !maps_per_pin)
- return -EINVAL;
+ if (!num_pins || !maps_per_pin) {
+ err = -EINVAL;
+ goto exit;
+ }

reserve = num_pins * maps_per_pin;

err = pinctrl_utils_reserve_map(pctldev, map,
reserved_maps, num_maps, reserve);
if (err)
- return err;
+ goto exit;

for (i = 0; i < num_pins; i++) {
err = of_property_read_u32_index(node, "pinmux",
i, &pinfunc);
if (err)
- return err;
+ goto exit;

pin = STM32_GET_PIN_NO(pinfunc);
func = STM32_GET_PIN_FUNC(pinfunc);

if (!stm32_pctrl_is_function_valid(pctl, pin, func)) {
dev_err(pctl->dev, "invalid function.\n");
- return -EINVAL;
+ err = -EINVAL;
+ goto exit;
}

grp = stm32_pctrl_find_group_by_pin(pctl, pin);
if (!grp) {
dev_err(pctl->dev, "unable to match pin %d to group\n",
pin);
- return -EINVAL;
+ err = -EINVAL;
+ goto exit;
}

err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map,
reserved_maps, num_maps);
if (err)
- return err;
+ goto exit;

if (has_config) {
err = pinctrl_utils_add_map_configs(pctldev, map,
@@ -479,11 +483,13 @@ static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
configs, num_configs,
PIN_MAP_TYPE_CONFIGS_GROUP);
if (err)
- return err;
+ goto exit;
}
}

- return 0;
+exit:
+ kfree(configs);
+ return err;
}

static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
--
2.17.1