linux-kernel - [PATCH 2/3] phy: qcom-qmp-usb-legacy: fix NULL pointer dereference in PM callbacks

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Message-Id: <20250825-qmp-null-deref-on-pm-v1-2-bbd3ca330849@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 17:22:03 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>,
        Poovendhan Selvaraj <quic_poovendh@...cinc.com>,
        stable@...r.kernel.org
Subject: [PATCH 2/3] phy: qcom-qmp-usb-legacy: fix NULL pointer dereference
 in PM callbacks

From: Poovendhan Selvaraj <quic_poovendh@...cinc.com>

The pm ops are enabled before qmp phy create which causes
a NULL pointer dereference when accessing qmp->phy->init_count
in the qmp_usb_runtime_suspend.

So if qmp->phy is NULL, bail out early in suspend / resume callbacks
to avoid the NULL pointer dereference in qmp_usb_runtime_suspend and
qmp_usb_runtime_resume.

Cc: stable@...r.kernel.org # v6.6
Fixes: e464a3180a43 ("phy: qcom-qmp-usb: split off the legacy USB+dp_com support")
Signed-off-by: Poovendhan Selvaraj <quic_poovendh@...cinc.com>
Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
---
 drivers/phy/qualcomm/phy-qcom-qmp-usb-legacy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usb-legacy.c b/drivers/phy/qualcomm/phy-qcom-qmp-usb-legacy.c
index 8bf951b0490cfd811635df8940de1b789e21b46c..ef28e59ffd58a12d6d416a553a3a478e9691b8c5 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usb-legacy.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb-legacy.c
@@ -988,7 +988,7 @@ static int __maybe_unused qmp_usb_legacy_runtime_suspend(struct device *dev)
 
 	dev_vdbg(dev, "Suspending QMP phy, mode:%d\n", qmp->mode);
 
-	if (!qmp->phy->init_count) {
+	if (!qmp->phy || !qmp->phy->init_count) {
 		dev_vdbg(dev, "PHY not initialized, bailing out\n");
 		return 0;
 	}
@@ -1009,7 +1009,7 @@ static int __maybe_unused qmp_usb_legacy_runtime_resume(struct device *dev)
 
 	dev_vdbg(dev, "Resuming QMP phy, mode:%d\n", qmp->mode);
 
-	if (!qmp->phy->init_count) {
+	if (!qmp->phy || !qmp->phy->init_count) {
 		dev_vdbg(dev, "PHY not initialized, bailing out\n");
 		return 0;
 	}

-- 
2.34.1