From a12b8ab8c5ff7ccd7b107a564743507c850a441d Mon Sep 17 00:00:00 2001 From: Alyssa Milburn Date: Sat, 1 Apr 2017 14:34:32 -0300 Subject: [media] ttusb2: limit messages to buffer size Otherwise ttusb2_i2c_xfer can read or write beyond the end of static and heap buffers. Signed-off-by: Alyssa Milburn Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/dvb-usb/ttusb2.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'drivers/media/usb') diff --git a/drivers/media/usb/dvb-usb/ttusb2.c b/drivers/media/usb/dvb-usb/ttusb2.c index ecc207fbaf3c..9e0d6a4166d2 100644 --- a/drivers/media/usb/dvb-usb/ttusb2.c +++ b/drivers/media/usb/dvb-usb/ttusb2.c @@ -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; -- cgit v1.2.3