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From:   Bhaumik Bhatt <bbhatt@codeaurora.org>
To:     mani@kernel.org
Cc:     linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        hemantk@codeaurora.org, Bhaumik Bhatt <bbhatt@codeaurora.org>
Subject: [PATCH v1 5/8] bus: mhi: core: WARN_ON for malformed vector table
Date:   Mon, 27 Apr 2020 11:32:19 -0700
Message-Id: <1588012342-4995-6-git-send-email-bbhatt@codeaurora.org>
In-Reply-To: <1588012342-4995-1-git-send-email-bbhatt@codeaurora.org>
References: <1588012342-4995-1-git-send-email-bbhatt@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
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Add a bounds check in the firmware copy routine to exit if a malformed
vector table is found while attempting to load the firmware in to the
BHIe vector table.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
---
 drivers/bus/mhi/core/boot.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
index 17c636b..bc70edc 100644
--- a/drivers/bus/mhi/core/boot.c
+++ b/drivers/bus/mhi/core/boot.c
@@ -362,8 +362,14 @@ static void mhi_firmware_copy(struct mhi_controller *mhi_cntrl,
 	int i = 0;
 	struct mhi_buf *mhi_buf = img_info->mhi_buf;
 	struct bhi_vec_entry *bhi_vec = img_info->bhi_vec;
+	struct device *dev = &mhi_cntrl->mhi_dev->dev;
 
 	while (remainder) {
+		if (WARN_ON(i >= img_info->entries)) {
+			dev_err(dev, "Malformed vector table\n");
+			return;
+		}
+
 		to_cpy = min(remainder, mhi_buf->len);
 		memcpy(mhi_buf->buf, buf, to_cpy);
 		bhi_vec->dma_addr = mhi_buf->dma_addr;
-- 
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