Invalid read in mpz_sub

[Torbjörn Granlund]

Miha Marolt <miham at beyondsemi.com> writes:

  In some cases a previously freed memory is read inside the mpz_sub function. Here is
  an example program that demonstrates the problem:

The bug is in your code.

When passing x by value, you make copies of the two contained mpz_t
variables, including pointers.  Then you cause reallocation of the
original variables, making pointer your copies point to stale data.


-- 
Torbjörn
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