From: Lorenzo Pieralisi lorenzo.pieralisi@arm.com
[ Upstream commit 5a46d3f71d5e5a9f82eabc682f996f1281705ac7 ]
Static analysis identified that index comparison against ITS entries in iort_dev_find_its_id() is off by one.
Update the comparison condition and clarify the resulting error message.
Fixes: 4bf2efd26d76 ("ACPI: Add new IORT functions to support MSI domain handling") Link: https://lore.kernel.org/linux-arm-kernel/20190613065410.GB16334@mwanda/ Reviewed-by: Hanjun Guo guohanjun@huawei.com Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Cc: Dan Carpenter dan.carpenter@oracle.com Cc: Will Deacon will@kernel.org Cc: Hanjun Guo guohanjun@huawei.com Cc: Sudeep Holla sudeep.holla@arm.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: Robin Murphy robin.murphy@arm.com Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/arm64/iort.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 43c2615434b48..e11b5da6f828f 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -616,8 +616,8 @@ static int iort_dev_find_its_id(struct device *dev, u32 req_id,
/* Move to ITS specific data */ its = (struct acpi_iort_its_group *)node->node_data; - if (idx > its->its_count) { - dev_err(dev, "requested ITS ID index [%d] is greater than available [%d]\n", + if (idx >= its->its_count) { + dev_err(dev, "requested ITS ID index [%d] overruns ITS entries [%d]\n", idx, its->its_count); return -ENXIO; }