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From:   Lizhi Hou <lizhi.hou@amd.com>
To:     <linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <herve.codina@bootlin.com>,
        <Jonathan.Cameron@Huawei.com>
CC:     Lizhi Hou <lizhi.hou@amd.com>, <bhelgaas@google.com>,
        <robh@kernel.org>
Subject: [PATCH 2/2] PCI: of_property: Fix uninitialized variable when of_irq_parse_raw() failed
Date:   Fri, 15 Sep 2023 11:08:07 -0700
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In function of_pci_prop_intr_map(), addr_sz[i] will be uninitialized if
of_irq_parse_raw() returns failure. Add addr_sz array initialization. And
when parsing irq failed, skip generating interrupt-map pair for the pin.

Fixes: 407d1a51921e ("PCI: Create device tree node for bridge")
Reported-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Closes: https://lore.kernel.org/all/20230911154856.000076c3@Huawei.com/
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
---
 drivers/pci/of_property.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/of_property.c b/drivers/pci/of_property.c
index 710ec35ba4a1..c2c7334152bc 100644
--- a/drivers/pci/of_property.c
+++ b/drivers/pci/of_property.c
@@ -186,8 +186,8 @@ static int of_pci_prop_interrupts(struct pci_dev *pdev,
 static int of_pci_prop_intr_map(struct pci_dev *pdev, struct of_changeset *ocs,
 				struct device_node *np)
 {
+	u32 i, addr_sz[OF_PCI_MAX_INT_PIN] = { 0 }, map_sz = 0;
 	struct of_phandle_args out_irq[OF_PCI_MAX_INT_PIN];
-	u32 i, addr_sz[OF_PCI_MAX_INT_PIN], map_sz = 0;
 	__be32 laddr[OF_PCI_ADDRESS_CELLS] = { 0 };
 	u32 int_map_mask[] = { 0xffff00, 0, 0, 7 };
 	struct device_node *pnode;
@@ -213,33 +213,44 @@ static int of_pci_prop_intr_map(struct pci_dev *pdev, struct of_changeset *ocs,
 		out_irq[i].args[0] = pin;
 		ret = of_irq_parse_raw(laddr, &out_irq[i]);
 		if (ret) {
-			pci_err(pdev, "parse irq %d failed, ret %d", pin, ret);
+			out_irq[i].np = NULL;
+			pci_dbg(pdev, "parse irq %d failed, ret %d", pin, ret);
 			continue;
 		}
-		ret = of_property_read_u32(out_irq[i].np, "#address-cells",
-					   &addr_sz[i]);
-		if (ret)
-			addr_sz[i] = 0;
+		of_property_read_u32(out_irq[i].np, "#address-cells",
+				     &addr_sz[i]);
 	}
 
 	list_for_each_entry(child, &pdev->subordinate->devices, bus_list) {
 		for (pin = 1; pin <= OF_PCI_MAX_INT_PIN; pin++) {
 			i = pci_swizzle_interrupt_pin(child, pin) - 1;
+			if (!out_irq[i].np)
+				continue;
 			map_sz += 5 + addr_sz[i] + out_irq[i].args_count;
 		}
 	}
 
+	/*
+	 * Parsing interrupt failed for all pins. In this case, it does not
+	 * need to generate interrupt-map property.
+	 */
+	if (!map_sz)
+		return 0;
+
 	int_map = kcalloc(map_sz, sizeof(u32), GFP_KERNEL);
 	mapp = int_map;
 
 	list_for_each_entry(child, &pdev->subordinate->devices, bus_list) {
 		for (pin = 1; pin <= OF_PCI_MAX_INT_PIN; pin++) {
+			i = pci_swizzle_interrupt_pin(child, pin) - 1;
+			if (!out_irq[i].np)
+				continue;
+
 			*mapp = (child->bus->number << 16) |
 				(child->devfn << 8);
 			mapp += OF_PCI_ADDRESS_CELLS;
 			*mapp = pin;
 			mapp++;
-			i = pci_swizzle_interrupt_pin(child, pin) - 1;
 			*mapp = out_irq[i].np->phandle;
 			mapp++;
 			if (addr_sz[i]) {
-- 
2.34.1