Patchwork [AUTOSEL,4.14,61/69] ACPI/IORT: Fix iort_get_platform_device_domain() uninitialized pointer value

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Submitter Sasha Levin
Date Dec. 5, 2018, 9:42 a.m.
Message ID <>
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Permalink /patch/672761/
State New
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Sasha Levin - Dec. 5, 2018, 9:42 a.m.
From: Lorenzo Pieralisi <>

[ Upstream commit ea2412dc21cc790335d319181dddc43682aef164 ]

Running the Clang static analyzer on IORT code detected the following

Logic error: Branch condition evaluates to a garbage value



If the named component associated with a given device has no IORT
mappings, iort_get_platform_device_domain() exits its MSI mapping loop
with msi_parent pointer containing garbage, which can lead to erroneous
code path execution.

Initialize the msi_parent pointer, fixing the bug.

Fixes: d4f54a186667 ("ACPI: platform: setup MSI domain for ACPI based
platform device")
Reported-by: Patrick Bellasi <>
Reviewed-by: Hanjun Guo <>
Acked-by: Will Deacon <>
Cc: Sudeep Holla <>
Cc: "Rafael J. Wysocki" <>
Signed-off-by: Lorenzo Pieralisi <>
Signed-off-by: Catalin Marinas <>
Signed-off-by: Sasha Levin <>
 drivers/acpi/arm64/iort.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index de56394dd161..ca414910710e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -547,7 +547,7 @@  struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id)
 static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
-	struct acpi_iort_node *node, *msi_parent;
+	struct acpi_iort_node *node, *msi_parent = NULL;
 	struct fwnode_handle *iort_fwnode;
 	struct acpi_iort_its_group *its;
 	int i;