From: Foster Snowhill Date: Tue, 6 Aug 2024 17:28:07 +0000 (+0200) Subject: usbnet: ipheth: drop RX URBs with no payload X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=94d7eeb6c0ef0310992944f0d0296929816a2cb0;p=users%2Fdwmw2%2Flinux.git usbnet: ipheth: drop RX URBs with no payload On iPhone 15 Pro Max one can observe periodic URBs with no payload on the "bulk in" (RX) endpoint. These don't seem to do anything meaningful. Reproduced on iOS 17.5.1 and 17.6. This behaviour isn't observed on iPhone 11 on the same iOS version. The nature of these zero-length URBs is so far unknown. Drop RX URBs with no payload. Signed-off-by: Foster Snowhill Signed-off-by: David S. Miller --- diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c index 017255615508f..f04c7bf796654 100644 --- a/drivers/net/usb/ipheth.c +++ b/drivers/net/usb/ipheth.c @@ -286,6 +286,12 @@ static void ipheth_rcvbulk_callback(struct urb *urb) return; } + /* iPhone may periodically send URBs with no payload + * on the "bulk in" endpoint. It is safe to ignore them. + */ + if (urb->actual_length == 0) + goto rx_submit; + /* RX URBs starting with 0x00 0x01 do not encapsulate Ethernet frames, * but rather are control frames. Their purpose is not documented, and * they don't affect driver functionality, okay to drop them.