linux-kernel - [ 31/55] USB: ffs-test: fix length argument of out function call

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Date:	Sun, 27 May 2012 09:26:44 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Matthias Fend <matthias.fend@...fvision.net>,
	Michal Nazarewicz <mina86@...a86.com>
Subject: [ 31/55] USB: ffs-test: fix length argument of out function call

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

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

From: Matthias Fend <Matthias.Fend@...fvision.net>

commit eb9c5836384cd2a276254df6254ed71117983626 upstream.

The out functions should only handle actual available data instead of the complete buffer.
Otherwise for example the ep0_consume function will report ghost events since it tries to decode
the complete buffer - which may contain partly invalid data.

Signed-off-by: Matthias Fend <matthias.fend@...fvision.net>
Acked-by: Michal Nazarewicz <mina86@...a86.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/usb/ffs-test.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/usb/ffs-test.c
+++ b/tools/usb/ffs-test.c
@@ -324,7 +324,7 @@ static void *start_thread_helper(void *a
 
 		ret = t->in(t, t->buf, t->buf_size);
 		if (ret > 0) {
-			ret = t->out(t, t->buf, t->buf_size);
+			ret = t->out(t, t->buf, ret);
 			name = out_name;
 			op = "write";
 		} else {


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