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[media] ttusb_dec: avoid the risk of go past buffer

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Fixes this smatch warning:
	drivers/media/usb/ttusb-dec/ttusb_dec.c:243 ttusb_dec_handle_irq() error: buffer overflow 'rc_keys' 26 <= 126

As the RC keys should be enabled previously, via:
	set_bit(rc_keys[i], input_dev->keybit);

It wouldn't go past the buffer in practice. Yet, as bad
things may happen when going past buffer, it doesn't hurt adding
a check here.

While here, fix CodingStyle issues on the routine.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-09-22 14:09:18 -03:00
parent e837d85c61
commit 3cc2691227
1 changed files with 18 additions and 12 deletions
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30
drivers/media/usb/ttusb-dec/ttusb_dec.c
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@ -206,7 +206,7 @@ static void ttusb_dec_set_model(struct ttusb_dec *dec,
static void ttusb_dec_handle_irq( struct urb *urb)
{
struct ttusb_dec * dec = urb->context;
struct ttusb_dec *dec = urb->context;
char *buffer = dec->irq_buffer;
int retval;
@ -227,25 +227,31 @@ static void ttusb_dec_handle_irq( struct urb *urb)
goto exit;
}
if( (buffer[0] == 0x1) && (buffer[2] == 0x15) ) {
/* IR - Event */
/* this is an fact a bit too simple implementation;
if ((buffer[0] == 0x1) && (buffer[2] == 0x15)) {
/*
* IR - Event
*
* this is an fact a bit too simple implementation;
* the box also reports a keyrepeat signal
* (with buffer[3] == 0x40) in an intervall of ~100ms.
* But to handle this correctly we had to imlemenent some
* kind of timer which signals a 'key up' event if no
* keyrepeat signal is received for lets say 200ms.
* this should/could be added later ...
* for now lets report each signal as a key down and up*/
dprintk("%s:rc signal:%d\n", __func__, buffer[4]);
input_report_key(dec->rc_input_dev, rc_keys[buffer[4] - 1], 1);
input_sync(dec->rc_input_dev);
input_report_key(dec->rc_input_dev, rc_keys[buffer[4] - 1], 0);
input_sync(dec->rc_input_dev);
* for now lets report each signal as a key down and up
*/
if (buffer[4] - 1 < ARRAY_SIZE(rc_keys)) {
dprintk("%s:rc signal:%d\n", __func__, buffer[4]);
input_report_key(dec->rc_input_dev, rc_keys[buffer[4] - 1], 1);
input_sync(dec->rc_input_dev);
input_report_key(dec->rc_input_dev, rc_keys[buffer[4] - 1], 0);
input_sync(dec->rc_input_dev);
}
}
exit: retval = usb_submit_urb(urb, GFP_ATOMIC);
if(retval)
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
printk("%s - usb_commit_urb failed with result: %d\n",
__func__, retval);
}