linux-kernel - [PATCH] media: dw2102: fix a potential buffer overflow

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Date: Mon, 29 Apr 2024 15:17:23 +0100
From: Mauro Carvalho Chehab <mchehab@...nel.org>
To: 
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	"Hans Verkuil" <hverkuil@...all.nl>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	Michael Bunk <micha@...edict.org>,
	Wei Chen <harperchen1110@...il.com>,
	Yu Zhe <yuzhe@...china.com>,
	Zhang Shurong <zhang_shurong@...mail.com>,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: [PATCH] media: dw2102: fix a potential buffer overflow

As pointed by smatch:
	 drivers/media/usb/dvb-usb/dw2102.c:802 su3000_i2c_transfer() error: __builtin_memcpy() '&state->data[4]' too small (64 vs 67)

That seemss to be due to a wrong copy-and-paste.

Reported-by: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
---
 drivers/media/usb/dvb-usb/dw2102.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c
index 03b411ad64bb..79e2ccf974c9 100644
--- a/drivers/media/usb/dvb-usb/dw2102.c
+++ b/drivers/media/usb/dvb-usb/dw2102.c
@@ -789,7 +789,7 @@ static int su3000_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 
 			if (msg[j].flags & I2C_M_RD) {
 				/* single read */
-				if (1 + msg[j].len > sizeof(state->data)) {
+				if (4 + msg[j].len > sizeof(state->data)) {
 					warn("i2c rd: len=%d is too big!\n", msg[j].len);
 					num = -EOPNOTSUPP;
 					break;
-- 
2.44.0