| Message ID | ZQSuboEIhvATAdxN@work |
|---|---|
| State | New |
| Headers | show |
| Series | [next] usb: atm: Use size_add() in call to struct_size() | expand |
On Fri, 15 Sep 2023 13:20:14 -0600, Gustavo A. R. Silva wrote: > 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()`. > > Applied to for-next/hardening, thanks! [1/1] usb: atm: Use size_add() in call to struct_size() https://git.kernel.org/kees/c/13f1a60fe04f Take care,
diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c index 1cdb8758ae01..2da6615fbb6f 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;
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 <gustavoars@kernel.org> --- drivers/usb/atm/usbatm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)