From: Adrian Wowk Date: Tue, 14 Apr 2026 01:00:50 +0000 (-0500) Subject: usbip: vhci_hcd: reduce CONFIG_USBIP_VHCI_NR_HCS upper bound to 32 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=105644154a60c8ec0c7b3e0758bd18c9a243a3b4;p=thirdparty%2Fkernel%2Fstable.git usbip: vhci_hcd: reduce CONFIG_USBIP_VHCI_NR_HCS upper bound to 32 Each VHCI HC instance registers two USB buses (one HS, one SS). USB_MAXBUS in drivers/usb/core/hcd.c is hard-coded to 64, giving an effective maximum of 32 VHCI HC instances (32 * 2 = 64 buses). The Kconfig range for USBIP_VHCI_NR_HCS currently allows up to 128, which will cause probe failures for any HC instance beyond the 32nd. These probe failures trigger the NULL pointer dereference fixed in the previous commit. Reduce the upper bound to 32 to reflect the real maximum imposed by USB_MAXBUS. Note that probe failures can still occur below this limit if real hardware has already claimed enough USB bus numbers, making the NULL check fix necessary regardless. Signed-off-by: Adrian Wowk Reviewed-by: Shuah Khan Link: https://patch.msgid.link/20260414010050.158064-3-dev@adrianwowk.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/usbip/Kconfig b/drivers/usb/usbip/Kconfig index b9f94e2e278d..50945b6fae1a 100644 --- a/drivers/usb/usbip/Kconfig +++ b/drivers/usb/usbip/Kconfig @@ -40,7 +40,7 @@ config USBIP_VHCI_HC_PORTS config USBIP_VHCI_NR_HCS int "Number of USB/IP virtual host controllers" - range 1 128 + range 1 32 default 1 depends on USBIP_VHCI_HCD help