linux-kernel - Re: [PATCH] regulator: rt4801: Fix NULL pointer dereference if priv->enable

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Message-ID: <1622716791.1034.13.camel@richtek.com>
Date:   Thu, 3 Jun 2021 10:39:51 +0000
From:   cy_huang(黃啟原) <cy_huang@...htek.com>
To:     "axel.lin@...ics.com" <axel.lin@...ics.com>,
        "broonie@...nel.org" <broonie@...nel.org>
CC:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: rt4801: Fix NULL pointer dereference if
 priv->enable_gpios is NULL

Hi, Axel:

Which case will cause this error? I'm not really sure.
But if devm_gpiod_get_array_optional will return null, then it must be check
earlier in probe function

        priv->enable_gpios = devm_gpiod_get_array_optional(&i2c->dev, "enable",
GPIOD_OUT_HIGH);
-       if (IS_ERR(priv->enable_gpios)) {+       if (IS_ERR_OR_NULL(priv->enable_gpios)) {

If so, this change will be more reasonable.
Cause in binding document, I already write the min item must be '1'.
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