linux-kernel - [PATCH] gpu: drm: bridge: anx7625: Fix NULL pointer dereference with early IRQ

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Message-Id: <20250709085438.56188-1-loic.poulain@oss.qualcomm.com>
Date: Wed,  9 Jul 2025 10:54:38 +0200
From: Loic Poulain <loic.poulain@....qualcomm.com>
To: andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org
Cc: lumag@...nel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        Loic Poulain <loic.poulain@....qualcomm.com>
Subject: [PATCH] gpu: drm: bridge: anx7625: Fix NULL pointer dereference with early IRQ

If the interrupt occurs before resource initialization is complete, the
interrupt handler/worker may access uninitialized data such as the I2C
tcpc_client device, potentially leading to NULL pointer dereference.

Signed-off-by: Loic Poulain <loic.poulain@....qualcomm.com>
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 5a81d1bfc815..0d8f4cc05387 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2678,7 +2678,7 @@ static int anx7625_i2c_probe(struct i2c_client *client)
 		ret = devm_request_threaded_irq(dev, platform->pdata.intp_irq,
 						NULL, anx7625_intr_hpd_isr,
 						IRQF_TRIGGER_FALLING |
-						IRQF_ONESHOT,
+						IRQF_ONESHOT | IRQF_NO_AUTOEN,
 						"anx7625-intp", platform);
 		if (ret) {
 			DRM_DEV_ERROR(dev, "fail to request irq\n");
@@ -2747,8 +2747,10 @@ static int anx7625_i2c_probe(struct i2c_client *client)
 	}
 
 	/* Add work function */
-	if (platform->pdata.intp_irq)
+	if (platform->pdata.intp_irq) {
+		enable_irq(platform->pdata.intp_irq);
 		queue_work(platform->workqueue, &platform->work);
+	}
 
 	if (platform->pdata.audio_en)
 		anx7625_register_audio(dev, platform);
-- 
2.34.1