[openssl-dev] [openssl.org #4100] Overlapping memcpy arguments in bn_add.c

[Kurt Roeckx via RT]

> 4/ in BN_usub, ap = a->d; and rp = r->d;
>   then the 2 pointers can be incremented, but an identical number of times
> 
> 5/ then memcpy is called with rp and ap that are still aliases, which is undefined behavior

The patch has been applied.


Kurt