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[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 <amilburn@zall.org>
Cc: stable@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Alyssa Milburn 2017-04-01 14:34:32 -03:00 committed by Mauro Carvalho Chehab
parent 5f2c467c54
commit a12b8ab8c5
1 changed files with 19 additions and 0 deletions
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19
drivers/media/usb/dvb-usb/ttusb2.c
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@ -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;