i2c: tegra: check msg length in SMBUS block read

For SMBUS block read, do not continue to read if the message length
passed from the device is '0' or greater than the maximum allowed bytes.

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20250424053320.19211-1-akhilrajeev@nvidia.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 87976e99e6d001e3a10e52c1219bd73cd34a2ac8..049b4d154c233705a50949ef8ff16a7c63ee2163 100644 (file)
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1395,6 +1395,11 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
                        ret = tegra_i2c_xfer_msg(i2c_dev, &msgs[i], MSG_END_CONTINUE);
                        if (ret)
                                break;
+
+                       /* Validate message length before proceeding */
+                       if (msgs[i].buf[0] == 0 || msgs[i].buf[0] > I2C_SMBUS_BLOCK_MAX)
+                               break;
+
                        /* Set the msg length from first byte */
                        msgs[i].len += msgs[i].buf[0];
                        dev_dbg(i2c_dev->dev, "reading %d bytes\n", msgs[i].len);