Daniel Thompson 0b63408260 usb: Prevent memcpy() being called with NULL arguments ...

If there is no additional iface data then iface->extra is NULL and
iface->extralen is zero. Passing NULL to memcpy is undefined behaviour
even if the length of data to copy is zero. In other words a conforming
(debug) memcpy implementation is permitted to assert(dst && src) without
checking the value of n.

Add an extra branch to avoid this.

2014-12-18 22:50:27 +00:00

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