linux-kernel - [PATCH v2] wifi: mt76: mt7915: Fix null-ptr-deref in mt7915_mmio_wed

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Message-Id: <20250407061900.85317-1-bsdhenrymartin@gmail.com>
Date: Mon,  7 Apr 2025 14:19:00 +0800
From: Henry Martin <bsdhenrymartin@...il.com>
To: nbd@....name,
	lorenzo@...nel.org,
	ryder.lee@...iatek.com,
	shayne.chen@...iatek.com,
	sean.wang@...iatek.com,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com
Cc: linux-wireless@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Henry Martin <bsdhenrymartin@...il.com>
Subject: [PATCH v2] wifi: mt76: mt7915: Fix null-ptr-deref in mt7915_mmio_wed_init()

devm_ioremap() returns NULL on error. Currently, mt7915_mmio_wed_init()
does not check for this case, which results in a NULL pointer
dereference.

Prevent null pointer dereference in mt7915_mmio_wed_init().

Fixes: 4f831d18d12d ("wifi: mt76: mt7915: enable WED RX support")
Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
V1 -> V2: Add a blank line after each test and correct commit message.

 drivers/net/wireless/mediatek/mt76/mt7915/mmio.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c b/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
index 876f0692850a..9c4d5cea0c42 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
@@ -651,6 +651,9 @@ int mt7915_mmio_wed_init(struct mt7915_dev *dev, void *pdev_ptr,
 		wed->wlan.base = devm_ioremap(dev->mt76.dev,
 					      pci_resource_start(pci_dev, 0),
 					      pci_resource_len(pci_dev, 0));
+		if (!wed->wlan.base)
+			return -ENOMEM;
+
 		wed->wlan.phy_base = pci_resource_start(pci_dev, 0);
 		wed->wlan.wpdma_int = pci_resource_start(pci_dev, 0) +
 				      MT_INT_WED_SOURCE_CSR;
@@ -678,6 +681,9 @@ int mt7915_mmio_wed_init(struct mt7915_dev *dev, void *pdev_ptr,
 		wed->wlan.bus_type = MTK_WED_BUS_AXI;
 		wed->wlan.base = devm_ioremap(dev->mt76.dev, res->start,
 					      resource_size(res));
+		if (!wed->wlan.base)
+			return -ENOMEM;
+
 		wed->wlan.phy_base = res->start;
 		wed->wlan.wpdma_int = res->start + MT_INT_SOURCE_CSR;
 		wed->wlan.wpdma_mask = res->start + MT_INT_MASK_CSR;
-- 
2.34.1