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usbnet: ipheth: remove extraneous rx URB length check

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[ Upstream commit 655b46d7a3 ]

Rx URB length was already checked in ipheth_rcvbulk_callback_legacy()
and ipheth_rcvbulk_callback_ncm(), depending on the current mode.
The check in ipheth_rcvbulk_callback() was thus mostly a duplicate.

The only place in ipheth_rcvbulk_callback() where we care about the URB
length is for the initial control frame. These frames are always 4 bytes
long. This has been checked as far back as iOS 4.2.1 on iPhone 3G.

Remove the extraneous URB length check. For control frames, check for
the specific 4-byte length instead.

Signed-off-by: Foster Snowhill <forst@pen.gy>
Tested-by: Georgi Valkov <gvalkov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Foster Snowhill 2024-08-06 19:28:06 +02:00 committed by Greg Kroah-Hartman
parent 78bce66914
commit c2fb33a7fe
1 changed files with 2 additions and 6 deletions
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8
drivers/net/usb/ipheth.c
View File

@ -286,11 +286,6 @@ static void ipheth_rcvbulk_callback(struct urb *urb)
return;
}
if (urb->actual_length <= IPHETH_IP_ALIGN) {
dev->net->stats.rx_length_errors++;
return;
}
/* 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.
@ -298,7 +293,8 @@ static void ipheth_rcvbulk_callback(struct urb *urb)
* URB received from the bulk IN endpoint.
*/
if (unlikely
(((char *)urb->transfer_buffer)[0] == 0 &&
(urb->actual_length == 4 &&
((char *)urb->transfer_buffer)[0] == 0 &&
((char *)urb->transfer_buffer)[1] == 1))
goto rx_submit;