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usbnet: ipheth: drop RX URBs with no payload

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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>
This commit is contained in:
Foster Snowhill 2024-08-06 19:28:07 +02:00 committed by David S. Miller
parent 655b46d7a3
commit 94d7eeb6c0
1 changed files with 6 additions and 0 deletions
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6
drivers/net/usb/ipheth.c
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@ -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.