lkml.org 
[lkml]   [2017]   [Aug]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] hwmon:(stts751) buffer overread on wrong chip configuration
Date
If stts751 hw by some reason reports conversion rate bigger then 9:
ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_RATE);
then dereference stts751_intervals[priv->interval] leads to buffer
overread.

The path adds sanity check for value read from chip.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
---
drivers/hwmon/stts751.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/hwmon/stts751.c b/drivers/hwmon/stts751.c
index d56251d..f6eddbd 100644
--- a/drivers/hwmon/stts751.c
+++ b/drivers/hwmon/stts751.c
@@ -718,6 +718,10 @@ static int stts751_read_chip_config(struct stts751_priv *priv)
ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_RATE);
if (ret < 0)
return ret;
+ if (ret > ARRAY_SIZE(stts751_intervals)) {
+ dev_err(priv->dev, "Unrecognized conversion rate 0x%x\n", ret);
+ return -ENODEV;
+ }
priv->interval = ret;

ret = stts751_read_reg16(priv, &priv->event_max,
--
2.7.4
\
 
 \ /
  Last update: 2017-08-10 17:24    [W:0.060 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site