linux-kernel - [PATCH V2] usb: gadget: f_sourcesink: Fix isoc transfer for USB_SPEED_SUPER

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Date:   Sat, 22 Jan 2022 08:33:22 +0530
From:   Pavankumar Kondeti <quic_pkondeti@...cinc.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Pavankumar Kondeti" <quic_pkondeti@...cinc.com>
Subject: [PATCH V2] usb: gadget: f_sourcesink: Fix isoc transfer for USB_SPEED_SUPER_PLUS

Currently when gadget enumerates in super speed plus, the isoc
endpoint request buffer size is not calculated correctly. Fix
this by checking the gadget speed against USB_SPEED_SUPER_PLUS
and update the request buffer size.

Fixes: 90c4d05780d4 ("usb: fix various gadgets null ptr deref on 10gbps cabling.")
Signed-off-by: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
---

v2:

- Added Fixes tag
- Removed fallthrough as we are using single block in switch

 drivers/usb/gadget/function/f_sourcesink.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/function/f_sourcesink.c b/drivers/usb/gadget/function/f_sourcesink.c
index 1abf08e..6803cd6 100644
--- a/drivers/usb/gadget/function/f_sourcesink.c
+++ b/drivers/usb/gadget/function/f_sourcesink.c
@@ -584,6 +584,7 @@ static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
 
 	if (is_iso) {
 		switch (speed) {
+		case USB_SPEED_SUPER_PLUS:
 		case USB_SPEED_SUPER:
 			size = ss->isoc_maxpacket *
 					(ss->isoc_mult + 1) *
-- 
2.7.4