From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Date: Wed, 4 Feb 2026 13:34:27 +0000 (+0200)
Subject: reset: rzg2l-usbphy-ctrl: Check pwrrdy is valid before using it
X-Git-Tag: v7.0-rc5~36^2~6^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e0cf84109bc6c6768337123f1de24ff56b41c91b;p=thirdparty%2Flinux.git

reset: rzg2l-usbphy-ctrl: Check pwrrdy is valid before using it

The pwrrdy regmap_filed is allocated in rzg2l_usbphy_ctrl_pwrrdy_init()
only if the driver data is set to RZG2L_USBPHY_CTRL_PWRRDY. Check that
pwrrdy is valid before using it to avoid "Unable to handle kernel NULL
pointer dereference at virtual address" errors.

Fixes: c5b7cd9adefc ("reset: rzg2l-usbphy-ctrl: Add suspend/resume support")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---

diff --git a/drivers/reset/reset-rzg2l-usbphy-ctrl.c b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
index 32bc268c9149..05dd9b4a02df 100644
--- a/drivers/reset/reset-rzg2l-usbphy-ctrl.c
+++ b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
@@ -136,6 +136,9 @@ static int rzg2l_usbphy_ctrl_set_pwrrdy(struct regmap_field *pwrrdy,
 {
 	u32 val = power_on ? 0 : 1;
 
+	if (!pwrrdy)
+		return 0;
+
 	/* The initialization path guarantees that the mask is 1 bit long. */
 	return regmap_field_update_bits(pwrrdy, 1, val);
 }