ALSA: firewire-motu: add bounds check in put_user loop for DSP events

In the DSP event handling code, a put_user() loop copies event data.
When the user buffer size is not aligned to 4 bytes, it could overwrite
beyond the buffer boundary.

Fix by adding a bounds check before put_user().

Suggested-by: Takashi Iwai <[e-mail]>
Fixes: 634ec0b2906e ("ALSA: firewire-motu: notify event for parameter change in register DSP model")
Signed-off-by: Junrui Luo <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/firewire/motu/motu-hwdep.c

···
 		while (consumed < count &&
 		       snd_motu_register_dsp_message_parser_copy_event(motu, &ev)) {
 			ptr = (u32 __user *)(buf + consumed);
-			if (put_user(ev, ptr))
+			if (consumed + sizeof(ev) > count || put_user(ev, ptr))
 				return -EFAULT;
 			consumed += sizeof(ev);
 		}