| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 123/142] ACPI/IORT: Fix iort_get_platform_device_domain() uninitialized pointer value | Date | Fri, 14 Dec 2018 13:00:08 +0100 |
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4.19-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 08f26db2da7e..e938576e58cb 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -700,7 +700,7 @@ static void iort_set_device_domain(struct device *dev, */ 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; -- 2.19.1
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