6.6-stable review patch. If anyone has any objections, please let me know.
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From: Foster Snowhill forst@pen.gy
[ Upstream commit 94d7eeb6c0ef0310992944f0d0296929816a2cb0 ]
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 forst@pen.gy Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/usb/ipheth.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c index 017255615508..f04c7bf79665 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.