Patch "media: dvb-usb-v2: rtl28xxu: fix null-ptr-deref in rtl28xxu_i2c_xfer" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    media: dvb-usb-v2: rtl28xxu: fix null-ptr-deref in rtl28xxu_i2c_xfer

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-dvb-usb-v2-rtl28xxu-fix-null-ptr-deref-in-rtl2.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d96e38e8c5cd37886dc5c7f4dbc06334aed4dc2a
Author: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>
Date:   Sun May 7 15:52:47 2023 +0100

    media: dvb-usb-v2: rtl28xxu: fix null-ptr-deref in rtl28xxu_i2c_xfer
    
    [ Upstream commit aa4a447b81b84f69c1a89ad899df157f386d7636 ]
    
    In rtl28xxu_i2c_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 rtl28xxu_i2c_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()")
    
    Link: https://lore.kernel.org/linux-media/tencent_3623572106754AC2F266B316798B0F6CCA05@xxxxxx
    Signed-off-by: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index 795a012d40200..f7884bb56fccf 100644
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -176,6 +176,10 @@ static int rtl28xxu_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 			ret = -EOPNOTSUPP;
 			goto err_mutex_unlock;
 		} else if (msg[0].addr == 0x10) {
+			if (msg[0].len < 1 || msg[1].len < 1) {
+				ret = -EOPNOTSUPP;
+				goto err_mutex_unlock;
+			}
 			/* method 1 - integrated demod */
 			if (msg[0].buf[0] == 0x00) {
 				/* return demod page from driver cache */
@@ -189,6 +193,10 @@ static int rtl28xxu_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 				ret = rtl28xxu_ctrl_msg(d, &req);
 			}
 		} else if (msg[0].len < 2) {
+			if (msg[0].len < 1) {
+				ret = -EOPNOTSUPP;
+				goto err_mutex_unlock;
+			}
 			/* method 2 - old I2C */
 			req.value = (msg[0].buf[0] << 8) | (msg[0].addr << 1);
 			req.index = CMD_I2C_RD;
@@ -217,8 +225,16 @@ static int rtl28xxu_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 			ret = -EOPNOTSUPP;
 			goto err_mutex_unlock;
 		} else if (msg[0].addr == 0x10) {
+			if (msg[0].len < 1) {
+				ret = -EOPNOTSUPP;
+				goto err_mutex_unlock;
+			}
 			/* method 1 - integrated demod */
 			if (msg[0].buf[0] == 0x00) {
+				if (msg[0].len < 2) {
+					ret = -EOPNOTSUPP;
+					goto err_mutex_unlock;
+				}
 				/* save demod page for later demod access */
 				dev->page = msg[0].buf[1];
 				ret = 0;
@@ -231,6 +247,10 @@ static int rtl28xxu_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 				ret = rtl28xxu_ctrl_msg(d, &req);
 			}
 		} else if ((msg[0].len < 23) && (!dev->new_i2c_write)) {
+			if (msg[0].len < 1) {
+				ret = -EOPNOTSUPP;
+				goto err_mutex_unlock;
+			}
 			/* method 2 - old I2C */
 			req.value = (msg[0].buf[0] << 8) | (msg[0].addr << 1);
 			req.index = CMD_I2C_WR;



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