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pinctrl: sunxi: Fix a memory leak in 'sunxi_pinctrl_build_state()'

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[ Upstream commit a93a676b07 ]

If 'krealloc()' fails, 'pctl->functions' is set to NULL.
We should instead use a temp variable in order to be able to free the
previously allocated memeory, in case of OOM.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christophe JAILLET
2018-10-16 08:22:28 +02:00
committed by Greg Kroah-Hartman
parent fae3cf8874
commit ad78a95866
1 changed files with 7 additions and 4 deletions
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11
drivers/pinctrl/sunxi/pinctrl-sunxi.c
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@@ -1042,6 +1042,7 @@ static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,
static int sunxi_pinctrl_build_state(struct platform_device *pdev)
{
struct sunxi_pinctrl *pctl = platform_get_drvdata(pdev);
void *ptr;
int i;
/*
@@ -1108,13 +1109,15 @@ static int sunxi_pinctrl_build_state(struct platform_device *pdev)
}
/* And now allocated and fill the array for real */
pctl->functions = krealloc(pctl->functions,
pctl->nfunctions * sizeof(*pctl->functions),
GFP_KERNEL);
if (!pctl->functions) {
ptr = krealloc(pctl->functions,
pctl->nfunctions * sizeof(*pctl->functions),
GFP_KERNEL);
if (!ptr) {
kfree(pctl->functions);
pctl->functions = NULL;
return -ENOMEM;
}
pctl->functions = ptr;
for (i = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;