serial: mctrl_gpio: Check for NULL pointer
When using mctrl_gpio_to_gpiod, it dereferences gpios into a single requested GPIO. This dereferencing can break if gpios is NULL, so this patch adds a NULL check before dereferencing it. If gpios is NULL, this function will also return NULL. Signed-off-by: Adam Ford <aford173@gmail.com> Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com> Link: https://lore.kernel.org/r/20191006163314.23191-1-aford173@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>alistair/sunxi64-5.4-dsi
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5df884d4b8
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37e3ab00e4
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@ -66,6 +66,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set);
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struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
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struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
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enum mctrl_gpio_idx gidx)
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enum mctrl_gpio_idx gidx)
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{
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{
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if (gpios == NULL)
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return NULL;
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return gpios->gpio[gidx];
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return gpios->gpio[gidx];
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}
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}
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EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod);
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EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod);
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