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[media] gp8psk: don't go past the buffer size

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Add checks to avoid going out of the buffer.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-10-07 14:12:48 -03:00
parent fa86c9a1fc
commit f1a503dddf
1 changed files with 11 additions and 0 deletions
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11
drivers/media/usb/dvb-usb/gp8psk.c
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@ -60,6 +60,9 @@ int gp8psk_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value, u16 index, u8
struct gp8psk_state *st = d->priv;
int ret = 0,try = 0;
if (blen > sizeof(st->data))
return -EIO;
if ((ret = mutex_lock_interruptible(&d->usb_mutex)))
return ret;
@ -98,6 +101,9 @@ int gp8psk_usb_out_op(struct dvb_usb_device *d, u8 req, u16 value,
deb_xfer("out: req. %x, val: %x, ind: %x, buffer: ",req,value,index);
debug_dump(b,blen,deb_xfer);
if (blen > sizeof(st->data))
return -EIO;
if ((ret = mutex_lock_interruptible(&d->usb_mutex)))
return ret;
@ -151,6 +157,11 @@ static int gp8psk_load_bcm4500fw(struct dvb_usb_device *d)
err("failed to load bcm4500 firmware.");
goto out_free;
}
if (buflen > 64) {
err("firmare chunk size bigger than 64 bytes.");
goto out_free;
}
memcpy(buf, ptr, buflen);
if (dvb_usb_generic_write(d, buf, buflen)) {
err("failed to load bcm4500 firmware.");