This is a note to let you know that I've just added the patch titled
net: lan78xx: fix division by zero in send path
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-lan78xx-fix-division-by-zero-in-send-path.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From db6c3c064f5d55fa9969f33eafca3cdbefbb3541 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Tue, 26 Oct 2021 12:36:17 +0200
Subject: net: lan78xx: fix division by zero in send path
From: Johan Hovold <johan@xxxxxxxxxx>
commit db6c3c064f5d55fa9969f33eafca3cdbefbb3541 upstream.
Add the missing endpoint max-packet sanity check to probe() to avoid
division by zero in lan78xx_tx_bh() in case a malicious device has
broken descriptors (or when doing descriptor fuzz testing).
Note that USB core will reject URBs submitted for endpoints with zero
wMaxPacketSize but that drivers doing packet-size calculations still
need to handle this (cf. commit 2548288b4fb0 ("USB: Fix: Don't skip
endpoint descriptors with maxpacket=0")).
Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Cc: stable@xxxxxxxxxxxxxxx # 4.3
Cc: Woojung.Huh@xxxxxxxxxxxxx <Woojung.Huh@xxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/usb/lan78xx.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -3745,6 +3745,12 @@ static int lan78xx_probe(struct usb_inte
dev->maxpacket = usb_maxpacket(dev->udev, dev->pipe_out, 1);
+ /* Reject broken descriptors. */
+ if (dev->maxpacket == 0) {
+ ret = -ENODEV;
+ goto out4;
+ }
+
/* driver requires remote-wakeup capability during autosuspend. */
intf->needs_remote_wakeup = 1;
Patches currently in stable-queue which might be from johan@xxxxxxxxxx are
queue-5.10/mmc-vub300-fix-control-message-timeouts.patch
queue-5.10/usbnet-sanity-check-for-maxpacket.patch
queue-5.10/usbnet-fix-error-return-code-in-usbnet_probe.patch
queue-5.10/net-lan78xx-fix-division-by-zero-in-send-path.patch
