Hi, In file librtmp/dh.h, in function DHInit() there is this code: failed: if (dh) MDH_free(dh); In the same file there is also (this is on a single line): #define MDH_free(vp) {MDH *dh = vp; dhm_free(&dh->ctx); MP_free(dh->p); MP_free(dh->g); MP_free(dh->pub_key); MP_free(dh->priv_key); free(dh);} When this macro is written open, it will generate code that looks like this: MDH *dh = dh; As you can see from the example program from below, this will result dh being uninitialized pointer. -------------- code start ------------------- #include <stdio.h> #define MDH_free(vp) {int *aa = vp; printf("%d\n", *aa ); } #define MDH_free2(vp) {int *ab = vp; printf("%d\n", *ab ); } int main() { int a = 6; int *aa = &a; printf("%d\n", *aa ); MDH_free(aa) MDH_free2(aa) return 0; } -------------- code end ------------------- Program output: 6 -1991643855 6 -- Reijo