4.14-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit ea2412dc21cc790335d319181dddc43682aef164 ]
Running the Clang static analyzer on IORT code detected the following error:
Logic error: Branch condition evaluates to a garbage value
in
iort_get_platform_device_domain()
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 patrick.bellasi@arm.com Reviewed-by: Hanjun Guo hanjun.guo@linaro.org Acked-by: Will Deacon will.deacon@arm.com Cc: Sudeep Holla sudeep.holla@arm.com Cc: "Rafael J. Wysocki" rjw@rjwysocki.net Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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;