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ALSA: fireworks: fix wrong return count shorter than expected by 4 bytes 

commit eb9d84b0ff upstream.

ALSA fireworks driver has a bug in its initial state to return count
shorter than expected by 4 bytes to userspace applications when handling
response frame for Echo Audio Fireworks transaction. It's due to missing
addition of the size for the type of event in ALSA firewire stack.

Fixes: 555e8a8f7f ("ALSA: fireworks: Add command/response functionality into hwdep interface")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20220424102428.21109-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Sakamoto 2022-04-24 19:24:28 +09:00 committed by Greg Kroah-Hartman
parent b8b7cc4b5a
commit 0e03be0626
1 changed files with 1 additions and 0 deletions
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1
sound/firewire/fireworks/fireworks_hwdep.c
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@ -35,6 +35,7 @@ hwdep_read_resp_buf(struct snd_efw *efw, char __user *buf, long remained,
type = SNDRV_FIREWIRE_EVENT_EFW_RESPONSE;
if (copy_to_user(buf, &type, sizeof(type)))
return -EFAULT;
count += sizeof(type);
remained -= sizeof(type);
buf += sizeof(type);