Commit 5ba52c08 authored by Alyssa Milburn's avatar Alyssa Milburn Committed by Sasha Levin

[media] ttusb2: limit messages to buffer size

[ Upstream commit a12b8ab8 ]

Otherwise ttusb2_i2c_xfer can read or write beyond the end of static and
heap buffers.
Signed-off-by: default avatarAlyssa Milburn <amilburn@zall.org>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent e1dfe98d
......@@ -78,6 +78,9 @@ static int ttusb2_msg(struct dvb_usb_device *d, u8 cmd,
u8 *s, *r = NULL;
int ret = 0;
if (4 + rlen > 64)
return -EIO;
s = kzalloc(wlen+4, GFP_KERNEL);
if (!s)
return -ENOMEM;
......@@ -381,6 +384,22 @@ static int ttusb2_i2c_xfer(struct i2c_adapter *adap,struct i2c_msg msg[],int num
write_read = i+1 < num && (msg[i+1].flags & I2C_M_RD);
read = msg[i].flags & I2C_M_RD;
if (3 + msg[i].len > sizeof(obuf)) {
err("i2c wr len=%d too high", msg[i].len);
break;
}
if (write_read) {
if (3 + msg[i+1].len > sizeof(ibuf)) {
err("i2c rd len=%d too high", msg[i+1].len);
break;
}
} else if (read) {
if (3 + msg[i].len > sizeof(ibuf)) {
err("i2c rd len=%d too high", msg[i].len);
break;
}
}
obuf[0] = (msg[i].addr << 1) | (write_read | read);
if (read)
obuf[1] = 0;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment