Don't free ephemeral ECDH keys twice.

ecdh_compute_shared() was changed to immediately delete the ephemeral key after
the shared secret was computed.  Therefore, the pointer to the ecdh_t struct
should be zeroed so it won't be freed again when a struct sptps_t is freed.

diff --git a/src/sptps.c b/src/sptps.c
index 5d0d456..03a1e9a 100644 (file)
--- a/src/sptps.c
+++ b/src/sptps.c
@@ -319,6 +319,7 @@ static bool receive_sig(sptps_t *s, const char *data, uint16_t len) {
        char shared[ECDH_SHARED_SIZE];
        if(!ecdh_compute_shared(s->ecdh, s->hiskex + 1 + 32, shared))
                return false;
+       s->ecdh = NULL;
 
        // Generate key material from shared secret.
        if(!generate_key_material(s, shared, sizeof shared))