Patch "media: dvb-usb-v2: ec168: fix null-ptr-deref in ec168_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: ec168: fix null-ptr-deref in ec168_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-ec168-fix-null-ptr-deref-in-ec168_i.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 649d61c57bc78cbf3d403bd322762df759c3a6b5
Author: Wei Chen <harperchen1110@xxxxxxxxx>
Date:   Mon Mar 13 08:58:53 2023 +0000

    media: dvb-usb-v2: ec168: fix null-ptr-deref in ec168_i2c_xfer()
    
    [ Upstream commit a6dcefcc08eca1bf4e3d213c97c3cfb75f377935 ]
    
    In ec168_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.
    If accessing msg[i].buf[0] without sanity check, null pointer 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/20230313085853.3252349-1-harperchen1110@xxxxxxxxx
    Signed-off-by: Wei Chen <harperchen1110@xxxxxxxxx>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/usb/dvb-usb-v2/ec168.c b/drivers/media/usb/dvb-usb-v2/ec168.c
index 7ed0ab9e429b1..0e4773fc025c9 100644
--- a/drivers/media/usb/dvb-usb-v2/ec168.c
+++ b/drivers/media/usb/dvb-usb-v2/ec168.c
@@ -115,6 +115,10 @@ static int ec168_i2c_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].addr == ec168_ec100_config.demod_address) {
+				if (msg[i].len < 1) {
+					i = -EOPNOTSUPP;
+					break;
+				}
 				req.cmd = READ_DEMOD;
 				req.value = 0;
 				req.index = 0xff00 + msg[i].buf[0]; /* reg */
@@ -131,6 +135,10 @@ static int ec168_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 			}
 		} else {
 			if (msg[i].addr == ec168_ec100_config.demod_address) {
+				if (msg[i].len < 1) {
+					i = -EOPNOTSUPP;
+					break;
+				}
 				req.cmd = WRITE_DEMOD;
 				req.value = msg[i].buf[1]; /* val */
 				req.index = 0xff00 + msg[i].buf[0]; /* reg */
@@ -139,6 +147,10 @@ static int ec168_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 				ret = ec168_ctrl_msg(d, &req);
 				i += 1;
 			} else {
+				if (msg[i].len < 1) {
+					i = -EOPNOTSUPP;
+					break;
+				}
 				req.cmd = WRITE_I2C;
 				req.value = msg[i].buf[0]; /* val */
 				req.index = 0x0100 + msg[i].addr; /* I2C addr */



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