linux-kernel - [PATCH 4.9 108/310] ARM64: PCI: Fix struct acpi_pci_root

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Date:   Wed, 11 Apr 2018 20:34:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomasz Nowicki <tn@...ihalf.com>,
        Timmy Li <lixiaoping3@...wei.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Will Deacon <will.deacon@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 108/310] ARM64: PCI: Fix struct acpi_pci_root_ops allocation failure path

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Timmy Li <lixiaoping3@...wei.com>


[ Upstream commit 717902cc93118119a6fce7765da6cf2786987418 ]

Commit 093d24a20442 ("arm64: PCI: Manage controller-specific data on
per-controller basis") added code to allocate ACPI PCI root_ops
dynamically on a per host bridge basis but failed to update the
corresponding memory allocation failure path in pci_acpi_scan_root()
leading to a potential memory leakage.

Fix it by adding the required kfree call.

Fixes: 093d24a20442 ("arm64: PCI: Manage controller-specific data on per-controller basis")
Reviewed-by: Tomasz Nowicki <tn@...ihalf.com>
Signed-off-by: Timmy Li <lixiaoping3@...wei.com>
[lorenzo.pieralisi@....com: refactored code, rewrote commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC: Will Deacon <will.deacon@....com>
CC: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/kernel/pci.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -175,8 +175,10 @@ struct pci_bus *pci_acpi_scan_root(struc
 		return NULL;
 
 	root_ops = kzalloc_node(sizeof(*root_ops), GFP_KERNEL, node);
-	if (!root_ops)
+	if (!root_ops) {
+		kfree(ri);
 		return NULL;
+	}
 
 	ri->cfg = pci_acpi_setup_ecam_mapping(root);
 	if (!ri->cfg) {