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gpio: Fix kernel stack leak to userspace
The GPIO event descriptor was leaking kernel stack to userspace because we don't zero the variable before use. Ooops. Fix this. Cc: stable@vger.kernel.org Reported-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -744,6 +744,9 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p)
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struct gpioevent_data ge;
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int ret, level;
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/* Do not leak kernel stack to userspace */
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memset(&ge, 0, sizeof(ge));
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ge.timestamp = ktime_get_real_ns();
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level = gpiod_get_value_cansleep(le->desc);
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