[alsa-devel] [patch] ALSA: rawmidi: cleanup the get next midi device ioctl

Clemens Ladisch clemens at ladisch.de
Wed Sep 8 11:40:16 CEST 2010

Dan Carpenter wrote:
> I'm doing an audit to find integer overflows and my static checker
> complained that in the original code "device + 1" could overflow.  The
> overflow is harmless, but it's still worth cleaning up.  The other thing
> that I noticed is that if you pass in a device which is higher than
> SNDRV_RAWMIDI_DEVICES then it doesn't return an error code but just
> tells you that the next device is "device + 1".
> I have rewritten it to just return -EINVAL if you pass in a bogus value
> that's either too high or too low.

A negative value is a valid input.

> +		if (device > SNDRV_RAWMIDI_DEVICES)
> +			return -EINVAL;

		if (device >= SNDRV_RAWMIDI_DEVICES)


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