[ 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 <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Hanjun Guo <[email protected]>
Cc: Sudeep Holla <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Robin Murphy <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
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 6b81746cd13c8..e5b1b3f1c2319 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -324,8 +324,8 @@ 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;
}
--
2.20.1
