linux-kernel - [PATCH AUTOSEL 5.7 08/25] habanalabs: prevent possible out-of-bounds array access

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Message-Id: <20200727232345.717432-8-sashal@kernel.org>
Date:   Mon, 27 Jul 2020 19:23:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Oded Gabbay <oded.gabbay@...il.com>,
        Tomer Tayar <ttayar@...ana.ai>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.7 08/25] habanalabs: prevent possible out-of-bounds array access

From: Oded Gabbay <oded.gabbay@...il.com>

[ Upstream commit cea7a0449ea3fa4883bf5dc8397f000d6b67d6cd ]

Queue index is received from the user. Therefore, we must validate it
before using it to access the queue props array.

Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
Reviewed-by: Tomer Tayar <ttayar@...ana.ai>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/misc/habanalabs/command_submission.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/habanalabs/command_submission.c b/drivers/misc/habanalabs/command_submission.c
index 409276b6374d7..e7c8e7473226f 100644
--- a/drivers/misc/habanalabs/command_submission.c
+++ b/drivers/misc/habanalabs/command_submission.c
@@ -425,11 +425,19 @@ static int validate_queue_index(struct hl_device *hdev,
 	struct asic_fixed_properties *asic = &hdev->asic_prop;
 	struct hw_queue_properties *hw_queue_prop;
 
+	/* This must be checked here to prevent out-of-bounds access to
+	 * hw_queues_props array
+	 */
+	if (chunk->queue_index >= HL_MAX_QUEUES) {
+		dev_err(hdev->dev, "Queue index %d is invalid\n",
+			chunk->queue_index);
+		return -EINVAL;
+	}
+
 	hw_queue_prop = &asic->hw_queues_props[chunk->queue_index];
 
-	if ((chunk->queue_index >= HL_MAX_QUEUES) ||
-			(hw_queue_prop->type == QUEUE_TYPE_NA)) {
-		dev_err(hdev->dev, "Queue index %d is invalid\n",
+	if (hw_queue_prop->type == QUEUE_TYPE_NA) {
+		dev_err(hdev->dev, "Queue index %d is not applicable\n",
 			chunk->queue_index);
 		return -EINVAL;
 	}
-- 
2.25.1