From: Gustavo A. R. Silva Date: Fri, 15 Sep 2023 19:20:14 +0000 (-0600) Subject: usb: atm: Use size_add() in call to struct_size() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b7fa76e03b0d83a035b20e0ef1a3d65a4557f76c;p=linux.git usb: atm: Use size_add() in call to struct_size() If, for any reason, the open-coded arithmetic causes a wraparound, the protection that `struct_size()` adds against potential integer overflows is defeated. Fix this by hardening call to `struct_size()` with `size_add()`. Fixes: b626871a7cda ("usb: atm: Use struct_size() helper") Signed-off-by: "Gustavo A. R. Silva" Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/ZQSuboEIhvATAdxN@work Signed-off-by: Kees Cook --- diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c index 1cdb8758ae01b..2da6615fbb6f4 100644 --- a/drivers/usb/atm/usbatm.c +++ b/drivers/usb/atm/usbatm.c @@ -1018,7 +1018,8 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, size_t size; /* instance init */ - size = struct_size(instance, urbs, num_rcv_urbs + num_snd_urbs); + size = struct_size(instance, urbs, + size_add(num_rcv_urbs, num_snd_urbs)); instance = kzalloc(size, GFP_KERNEL); if (!instance) return -ENOMEM;