Merge: i2c: tegra: check msg length in SMBUS block read

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6998

JIRA: https://issues.redhat.com/browse/RHEL-89167

NVIDIA: Seeing WARNING with i2c_tegra (RHEL 9.7)

Signed-off-by: Steve Dunnagan <sdunnaga@redhat.com>

Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: David Arcari <darcari@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Augusto Caringi <acaringi@redhat.com>

Author: caringi

drivers/i2c/busses/i2c-tegra.c

@@ -1397,6 +1397,11 @@ 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);