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Date: Tue, 10 May 2022 15:06:39 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Takashi Sakamoto <o-takashi@...amocchi.jp>, Takashi Iwai <tiwai@...e.de> Subject: [PATCH 5.17 009/140] ALSA: fireworks: fix wrong return count shorter than expected by 4 bytes From: Takashi Sakamoto <o-takashi@...amocchi.jp> commit eb9d84b0ffe39893cb23b0b6712bbe3637fa25fa 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: 555e8a8f7f14 ("ALSA: fireworks: Add command/response functionality into hwdep interface") Cc: <stable@...r.kernel.org> Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp> Link: https://lore.kernel.org/r/20220424102428.21109-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@...e.de> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- sound/firewire/fireworks/fireworks_hwdep.c | 1 + 1 file changed, 1 insertion(+) --- a/sound/firewire/fireworks/fireworks_hwdep.c +++ b/sound/firewire/fireworks/fireworks_hwdep.c @@ -34,6 +34,7 @@ hwdep_read_resp_buf(struct snd_efw *efw, 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);
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