UPSTREAM: pwm: Improve args checking in pwm_apply_state()

[firefly-linux-kernel-4.4.55.git] / drivers / pwm / core.c

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 6ec9a0ce9c44753451ac6855f16d659731659a52..869af8448059aa1115ceca08014f2cd658617305 100644 (file)
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -459,7 +459,8 @@ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state)
 {
        int err;
 
-       if (!pwm)
+       if (!pwm || !state || !state->period ||
+           state->duty_cycle > state->period)
                return -EINVAL;
 
        if (!memcmp(state, &pwm->state, sizeof(*state)))