linux-kernel - [PATCH AUTOSEL 4.19 04/14] media: anysee: fix null-ptr-deref in anysee_master

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Message-Id: <20230909004045.3581014-4-sashal@kernel.org>
Date:   Fri,  8 Sep 2023 20:40:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhang Shurong <zhang_shurong@...mail.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sasha Levin <sashal@...nel.org>, crope@....fi,
        mchehab@...nel.org, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 04/14] media: anysee: fix null-ptr-deref in anysee_master_xfer

From: Zhang Shurong <zhang_shurong@...mail.com>

[ Upstream commit c30411266fd67ea3c02a05c157231654d5a3bdc9 ]

In anysee_master_xfer, msg is controlled by user. When msg[i].buf
is null and msg[i].len is zero, former checks on msg[i].buf would be
passed. Malicious data finally reach anysee_master_xfer. If accessing
msg[i].buf[0] without sanity check, null ptr deref would happen.
We add check on msg[i].len to prevent crash.

Similar commit:
commit 0ed554fd769a
("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")

Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
[hverkuil: add spaces around +]
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/dvb-usb-v2/anysee.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb-v2/anysee.c b/drivers/media/usb/dvb-usb-v2/anysee.c
index 20ee7eea2a91e..83af86505363b 100644
--- a/drivers/media/usb/dvb-usb-v2/anysee.c
+++ b/drivers/media/usb/dvb-usb-v2/anysee.c
@@ -211,7 +211,7 @@ static int anysee_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
 
 	while (i < num) {
 		if (num > i + 1 && (msg[i+1].flags & I2C_M_RD)) {
-			if (msg[i].len > 2 || msg[i+1].len > 60) {
+			if (msg[i].len != 2 || msg[i + 1].len > 60) {
 				ret = -EOPNOTSUPP;
 				break;
 			}
-- 
2.40.1