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Message-Id: <20190814165804.158940439@linuxfoundation.org>
Date: Wed, 14 Aug 2019 19:00:58 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Hanjun Guo <guohanjun@...wei.com>,
Dan Carpenter <dan.carpenter@...cle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Will Deacon <will@...nel.org>,
Sudeep Holla <sudeep.holla@....com>,
Catalin Marinas <catalin.marinas@....com>,
Robin Murphy <robin.murphy@....com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.2 102/144] ACPI/IORT: Fix off-by-one check in iort_dev_find_its_id()
[ 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@...wei.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Will Deacon <will@...nel.org>
Cc: Hanjun Guo <guohanjun@...wei.com>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Robin Murphy <robin.murphy@....com>
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 d4551e33fa716..8569b79e8b581 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -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;
}
--
2.20.1
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