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[thermal:,thermal/fixes] thermal/drivers/mediatek/lvts_thermal: Guard against efuse data buffer overflow

Message ID 171568193401.10875.1393372785699330172.tip-bot2@tip-bot2 (mailing list archive)
State Not Applicable, archived
Headers show
Series [thermal:,thermal/fixes] thermal/drivers/mediatek/lvts_thermal: Guard against efuse data buffer overflow | expand

Commit Message

thermal-bot for Stanislaw Gruszka May 14, 2024, 10:18 a.m. UTC 
The following commit has been merged into the thermal/fixes branch of thermal:

Commit-ID:     2cc0b1a2169b0f4af83cc5a52a1693c8ab2e2f1d
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git//2cc0b1a2169b0f4af83cc5a52a1693c8ab2e2f1d
Author:        Nicolas Pitre <npitre@baylibre.com>
AuthorDate:    Mon, 01 Apr 2024 23:25:39 -04:00
Committer:     Daniel Lezcano <daniel.lezcano@linaro.org>
CommitterDate: Tue, 23 Apr 2024 12:40:29 +02:00

thermal/drivers/mediatek/lvts_thermal: Guard against efuse data buffer overflow

We don't want to silently fetch garbage past the actual buffer.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20240402032729.2736685-6-nico@fluxnic.net
---
 drivers/thermal/mediatek/lvts_thermal.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
index 9e6ed8b..1467994 100644
--- a/drivers/thermal/mediatek/lvts_thermal.c
+++ b/drivers/thermal/mediatek/lvts_thermal.c
@@ -672,7 +672,8 @@  static int lvts_sensor_init(struct device *dev, struct lvts_ctrl *lvts_ctrl,
  */
 static int lvts_calibration_init(struct device *dev, struct lvts_ctrl *lvts_ctrl,
 					const struct lvts_ctrl_data *lvts_ctrl_data,
-					u8 *efuse_calibration)
+					u8 *efuse_calibration,
+					size_t calib_len)
 {
 	int i;
 
@@ -680,6 +681,11 @@  static int lvts_calibration_init(struct device *dev, struct lvts_ctrl *lvts_ctrl
 		const struct lvts_sensor_data *sensor =
 					&lvts_ctrl_data->lvts_sensor[i];
 
+		if (sensor->cal_offsets[0] >= calib_len ||
+		    sensor->cal_offsets[1] >= calib_len ||
+		    sensor->cal_offsets[2] >= calib_len)
+			return -EINVAL;
+
 		lvts_ctrl->calibration[i] =
 			(efuse_calibration[sensor->cal_offsets[0]] << 0) +
 			(efuse_calibration[sensor->cal_offsets[1]] << 8) +
@@ -791,7 +797,8 @@  static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td,
 
 		ret = lvts_calibration_init(dev, &lvts_ctrl[i],
 					    &lvts_data->lvts_ctrl[i],
-					    lvts_td->calib);
+					    lvts_td->calib,
+					    lvts_td->calib_len);
 		if (ret)
 			return ret;