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linux/drivers/net/usb
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Laurent Vivier 1505b2cb6a usbnet: cap max_mtu for drivers without bind callback 
usbnet_probe() initializes max_mtu to ETH_MAX_MTU and only caps it
inside the if (info->bind) block. Drivers without a bind callback
never enter this block, so max_mtu stays at ETH_MAX_MTU.

QEMU's usb-net device (0x0525/0xa4a2) is claimed by the cdc_subset
driver which has no bind callback. The guest accepts any MTU from DHCP
(e.g. 65520 from passt), leading to TCP segments that exceed the
device's 2048-byte receive buffer and are silently dropped.

Initialize max_mtu to net->mtu at probe time and update it inside
the bind block.

Fixes: f77f0aee4d ("net: use core MTU range checking in USB NIC drivers")
Cc: jarod@redhat.com
Cc: stable@vger.kernel.org
Link: https://gitlab.com/qemu-project/qemu/-/issues/3268
Link: https://bugs.passt.top/show_bug.cgi?id=189
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Link: https://patch.msgid.link/20260731092711.857684-1-lvivier@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-08-04 18:17:20 -07:00
..
aqc111.c net: usb: aqc111: Do not perform PM inside suspend callback 2026-03-17 13:36:12 +01:00
aqc111.h
asix_common.c net: usb: remove unnecessary get_drvinfo code and driver versions 2026-01-30 17:44:18 -08:00
asix_devices.c net: usb: asix: ax88772: re-add usbnet_link_change() in phylink callbacks 2026-05-04 19:04:15 -07:00
asix.h net: usb: remove unnecessary get_drvinfo code and driver versions 2026-01-30 17:44:18 -08:00
ax88172a.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ax88179_178a.c net: usb: ax88179_178a: fix skb leak in ax88179_tx_fixup() 2026-08-03 17:50:51 -07:00
catc.c net: usb: catc: enable basic endpoint checking 2026-02-17 11:53:36 +01:00
cdc_eem.c
cdc_ether.c net: usb: cdc-ether: unify error handling in probe 2026-03-14 12:22:01 -07:00
cdc_mbim.c drivers: net: drop ipv6_stub usage and use direct function calls 2026-03-29 11:21:23 -07:00
cdc_ncm.c net: usb: cdc_ncm: add Apple Mac USB-C direct networking quirk 2026-05-01 17:17:27 -07:00
cdc_subset.c
cdc-phonet.c net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete() 2026-04-14 12:05:01 +02:00
ch9200.c net: ch9200: fix uninitialised access during mii_nway_restart 2025-05-28 19:10:04 -07:00
cx82310_eth.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
dm9601.c net: usb: introduce usbnet_mii_ioctl helper function 2026-02-03 19:41:19 -08:00
gl620a.c usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup() 2026-06-29 18:54:46 -07:00
hso.c net: hso: refactor endpoint lookup 2026-03-31 19:23:41 -07:00
huawei_cdc_ncm.c
int51x1.c net: usb: int51x1: use usbnet_cdc_update_filter 2026-01-27 17:55:32 -08:00
ipheth.c net: ipeth: refactor endpoint lookup 2026-03-31 19:23:41 -07:00
kalmia.c net: usb: kalmia: bound RX frame length in kalmia_rx_fixup() 2026-06-24 19:00:07 -07:00
kaweth.c net: usb: kaweth: validate USB endpoints 2026-02-25 18:58:05 -08:00
Kconfig net: usb: sr9700: remove code to drive nonexistent multicast filter 2026-02-03 19:42:15 -08:00
lan78xx.c net: usb: lan78xx: disable VLAN filter in promiscuous mode 2026-07-07 13:07:51 +02:00
lan78xx.h net: usb: lan78xx: fix silent drop of packets with checksum errors 2026-03-09 19:48:33 -07:00
lg-vl600.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
Makefile
mcs7830.c net: usb: introduce usbnet_mii_ioctl helper function 2026-02-03 19:41:19 -08:00
net1080.c net: usb: net1080: validate packet_len before pad-byte access in rx_fixup 2026-07-03 08:23:23 +02:00
pegasus.c net: usb: pegasus: replace simple_strtoul with kstrtouint 2026-05-13 18:06:56 -07:00
pegasus.h
plusb.c
qmi_wwan.c net: usb: qmi_wwan: add MeiG SRM813Q 2026-05-20 16:55:12 -07:00
r8152.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-06-11 14:33:35 -07:00
r8153_ecm.c cdc_ether|r8152: ThinkPad Hybrid USB-C/A Dock quirk 2025-03-17 21:25:25 +01:00
rndis_host.c rndis_host: enable power management for Telit LE310X1 2026-06-04 18:10:56 -07:00
rtl8150.c net: usb: rtl8150: free skb on usb_submit_urb() failure in xmit 2026-04-27 17:51:14 -07:00
sierra_net.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
smsc75xx.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
smsc75xx.h
smsc95xx.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
smsc95xx.h
sr9700.c net: usb: sr9700: remove code to drive nonexistent multicast filter 2026-02-03 19:42:15 -08:00
sr9700.h net: usb: sr9700: remove code to drive nonexistent multicast filter 2026-02-03 19:42:15 -08:00
sr9800.c net: usb: introduce usbnet_mii_ioctl helper function 2026-02-03 19:41:19 -08:00
sr9800.h net: usb: remove unnecessary get_drvinfo code and driver versions 2026-01-30 17:44:18 -08:00
usbnet.c usbnet: cap max_mtu for drivers without bind callback 2026-08-04 18:17:20 -07:00
zaurus.c