linux-kernel - [PATCH 08/17] habanalabs: add validity check for cq counter offset

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Date:   Mon, 20 Jun 2022 16:04:23 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     farah kassabri <fkassabri@...ana.ai>
Subject: [PATCH 08/17] habanalabs: add validity check for cq counter offset

From: farah kassabri <fkassabri@...ana.ai>

Driver performs no validity check for the user cq counter offset
used in both wait_for_interrupt and register_for_timestamp APIs.

Signed-off-by: farah kassabri <fkassabri@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/command_submission.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/common/command_submission.c b/drivers/misc/habanalabs/common/command_submission.c
index cbb7c29966ff..72a557b83a7d 100644
--- a/drivers/misc/habanalabs/common/command_submission.c
+++ b/drivers/misc/habanalabs/common/command_submission.c
@@ -2979,7 +2979,7 @@ static int ts_buff_get_kernel_ts_record(struct hl_mmap_mem_buf *buf,
 	u64 current_cq_counter;
 
 	/* Validate ts_offset not exceeding last max */
-	if (requested_offset_record > cb_last) {
+	if (requested_offset_record >= cb_last) {
 		dev_err(buf->mmg->dev, "Ts offset exceeds max CB offset(0x%llx)\n",
 								(u64)(uintptr_t)cb_last);
 		return -EINVAL;
@@ -3064,6 +3064,13 @@ static int _hl_interrupt_wait_ioctl(struct hl_device *hdev, struct hl_ctx *ctx,
 		goto put_ctx;
 	}
 
+	/* Validate the cq offset */
+	if (((u64 *) cq_cb->kernel_address + cq_counters_offset) >=
+			((u64 *) cq_cb->kernel_address + (cq_cb->size / sizeof(u64)))) {
+		rc = -EINVAL;
+		goto put_cq_cb;
+	}
+
 	if (register_ts_record) {
 		dev_dbg(hdev->dev, "Timestamp registration: interrupt id: %u, ts offset: %llu, cq_offset: %llu\n",
 					interrupt->interrupt_id, ts_offset, cq_counters_offset);
-- 
2.25.1