linux-kernel - [PATCH 3.18 079/150] ALSA: fireworks: fix an endianness bug for transaction length

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Message-Id: <20150114072059.421531162@linuxfoundation.org>
Date:	Tue, 13 Jan 2015 23:22:30 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Clemens Ladisch <clemens@...isch.de>,
	Takashi Sakamoto <o-takashi@...amocchi.jp>,
	Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 3.18 079/150] ALSA: fireworks: fix an endianness bug for transaction length

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Sakamoto <o-takashi@...amocchi.jp>

commit 92cb46584e104e2f4b14a44959109ffe13524a26 upstream.

Although the 't->length' is a big-endian value, it's used without any
conversion. This means that the driver always uses 'length' parameter.

Fixes: 555e8a8f7f14("ALSA: fireworks: Add command/response functionality into hwdep interface")
Reported-by: Clemens Ladisch <clemens@...isch.de>
Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/firewire/fireworks/fireworks_transaction.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/firewire/fireworks/fireworks_transaction.c
+++ b/sound/firewire/fireworks/fireworks_transaction.c
@@ -124,7 +124,7 @@ copy_resp_to_buf(struct snd_efw *efw, vo
 	spin_lock_irq(&efw->lock);
 
 	t = (struct snd_efw_transaction *)data;
-	length = min_t(size_t, t->length * sizeof(t->length), length);
+	length = min_t(size_t, be32_to_cpu(t->length) * sizeof(u32), length);
 
 	if (efw->push_ptr < efw->pull_ptr)
 		capacity = (unsigned int)(efw->pull_ptr - efw->push_ptr);


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