linux-kernel - [PATCH v3] iio: light: Add check for array bounds in veml6075_read_int_time

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z7dnrEpKQdRZ2qFU@Emma>
Date: Thu, 20 Feb 2025 17:34:36 +0000
From: Karan Sanghavi <karansanghvi98@...il.com>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Shuah Khan <skhan@...uxfoundation.org>,
	Karan Sanghavi <karansanghvi98@...il.com>
Subject: [PATCH v3] iio: light: Add check for array bounds in
 veml6075_read_int_time_ms

The array contains only 5 elements, but the index calculated by
veml6075_read_int_time_index can range from 0 to 7,
which could lead to out-of-bounds access. The check prevents this issue.

Coverity Issue
CID 1574309: (#1 of 1): Out-of-bounds read (OVERRUN)
overrun-local: Overrunning array veml6075_it_ms of 5 4-byte
elements at element index 7 (byte offset 31) using
index int_index (which evaluates to 7)

Fixes: 3b82f43238ae ("iio: light: add VEML6075 UVA and UVB light sensor driver")
Signed-off-by: Karan Sanghavi <karansanghvi98@...il.com>
---
 drivers/iio/light/veml6075.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/veml6075.c b/drivers/iio/light/veml6075.c
index 05d4c0e9015d..5dd951f6e989 100644
--- a/drivers/iio/light/veml6075.c
+++ b/drivers/iio/light/veml6075.c
@@ -201,7 +201,12 @@ static int veml6075_read_int_time_index(struct veml6075_data *data)
 	if (ret < 0)
 		return ret;
 
-	return FIELD_GET(VEML6075_CONF_IT, conf);
+	int int_index = FIELD_GET(VEML6075_CONF_IT, conf);
+
+	if (int_index >= ARRAY_SIZE(veml6075_it_ms))
+		return -EINVAL;
+
+	return int_index;
 }
 
 static int veml6075_read_int_time_ms(struct veml6075_data *data, int *val)
-- 
2.43.0