linux-kernel - [PATCH] x86/PCI: add a check for alloc_pci_root

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Message-Id: <20251225012821.1610670-1-lihaoxiang@isrc.iscas.ac.cn>
Date: Thu, 25 Dec 2025 09:28:21 +0800
From: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
To: bhelgaas@...gle.com,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
Subject: [PATCH] x86/PCI: add a check for alloc_pci_root_info()

Add a return value check for alloc_pci_root_info() to
prevent null pointer dereference in update_res().

Signed-off-by: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
---
 arch/x86/pci/broadcom_bus.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/pci/broadcom_bus.c b/arch/x86/pci/broadcom_bus.c
index 2db73613cada..d0cf7d2acc65 100644
--- a/arch/x86/pci/broadcom_bus.c
+++ b/arch/x86/pci/broadcom_bus.c
@@ -27,6 +27,8 @@ static void __init cnb20le_res(u8 bus, u8 slot, u8 func)
 	fbus = read_pci_config_byte(bus, slot, func, 0x44);
 	lbus = read_pci_config_byte(bus, slot, func, 0x45);
 	info = alloc_pci_root_info(fbus, lbus, 0, 0);
+	if (!info)
+		return;
 
 	/*
 	 * Add the legacy IDE ports on bus 0
-- 
2.25.1