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ACPI/IORT: Fix off-by-one check in iort_dev_find_its_id()

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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: 4bf2efd26d ("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>
This commit is contained in:
Lorenzo Pieralisi 2019-07-22 17:25:48 +01:00 committed by Will Deacon
parent 40ca0ce56d
commit 5a46d3f71d
1 changed files with 2 additions and 2 deletions
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4
drivers/acpi/arm64/iort.c
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@ -611,8 +611,8 @@ 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;
}