linux-kernel - [PATCH 4.4 16/80] usb: gadget: f_uac2: fix endianness of struct cntrl_*

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Date:   Mon,  3 Sep 2018 18:48:54 +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, Eugeniu Rosca <erosca@...adit-jv.com>,
        Ruslan Bilovol <ruslan.bilovol@...il.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 16/80] usb: gadget: f_uac2: fix endianness of struct cntrl_*_lay3

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

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

From: Eugeniu Rosca <roscaeugeniu@...il.com>

[ Upstream commit eec24f2a0d4dc3b1d95a3ccd2feb523ede3ba775 ]

The list [1] of commits doing endianness fixes in USB subsystem is long
due to below quote from USB spec Revision 2.0 from April 27, 2000:

------------
8.1 Byte/Bit Ordering

Multiple byte fields in standard descriptors, requests, and responses
are interpreted as and moved over the bus in little-endian order, i.e.
LSB to MSB.
------------

This commit belongs to the same family.

[1] Example of endianness fixes in USB subsystem:
commit 14e1d56cbea6 ("usb: gadget: f_uac2: endianness fixes.")
commit 42370b821168 ("usb: gadget: f_uac1: endianness fixes.")
commit 63afd5cc7877 ("USB: chaoskey: fix Alea quirk on big-endian hosts")
commit 74098c4ac782 ("usb: gadget: acm: fix endianness in notifications")
commit cdd7928df0d2 ("ACM gadget: fix endianness in notifications")
commit 323ece54e076 ("cdc-wdm: fix endianness bug in debug statements")
commit e102609f1072 ("usb: gadget: uvc: Fix endianness mismatches")
       list goes on

Fixes: 132fcb460839 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Eugeniu Rosca <erosca@...adit-jv.com>
Reviewed-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>

Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/gadget/function/f_uac2.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -941,14 +941,14 @@ static struct usb_descriptor_header *hs_
 };
 
 struct cntrl_cur_lay3 {
-	__u32	dCUR;
+	__le32	dCUR;
 };
 
 struct cntrl_range_lay3 {
-	__u16	wNumSubRanges;
-	__u32	dMIN;
-	__u32	dMAX;
-	__u32	dRES;
+	__le16	wNumSubRanges;
+	__le32	dMIN;
+	__le32	dMAX;
+	__le32	dRES;
 } __packed;
 
 static inline void
@@ -1296,9 +1296,9 @@ in_rq_cur(struct usb_function *fn, const
 		memset(&c, 0, sizeof(struct cntrl_cur_lay3));
 
 		if (entity_id == USB_IN_CLK_ID)
-			c.dCUR = p_srate;
+			c.dCUR = cpu_to_le32(p_srate);
 		else if (entity_id == USB_OUT_CLK_ID)
-			c.dCUR = c_srate;
+			c.dCUR = cpu_to_le32(c_srate);
 
 		value = min_t(unsigned, w_length, sizeof c);
 		memcpy(req->buf, &c, value);
@@ -1336,15 +1336,15 @@ in_rq_range(struct usb_function *fn, con
 
 	if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
 		if (entity_id == USB_IN_CLK_ID)
-			r.dMIN = p_srate;
+			r.dMIN = cpu_to_le32(p_srate);
 		else if (entity_id == USB_OUT_CLK_ID)
-			r.dMIN = c_srate;
+			r.dMIN = cpu_to_le32(c_srate);
 		else
 			return -EOPNOTSUPP;
 
 		r.dMAX = r.dMIN;
 		r.dRES = 0;
-		r.wNumSubRanges = 1;
+		r.wNumSubRanges = cpu_to_le16(1);
 
 		value = min_t(unsigned, w_length, sizeof r);
 		memcpy(req->buf, &r, value);