[PATCH v2 5/8] bus: mhi: core: WARN_ON for malformed vector table

Bhaumik Bhatt
2020-04-28T02:59:53Z

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>
Signed-off-by: Hemant Kumar <hemantk@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;