Language: C
Label: vulnerable
CWE: CWE-415 \u2014 Double Free
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.

Code:
TEE_Result crypto_acipher_alloc_dsa_keypair(struct dsa_keypair *s,
					    size_t key_size_bits __unused)
{
	memset(s, 0, sizeof(*s));
	if (!bn_alloc_max(&s->g))
		return TEE_ERROR_OUT_OF_MEMORY;

	if (!bn_alloc_max(&s->p))
		goto err;
	if (!bn_alloc_max(&s->q))
		goto err;
	if (!bn_alloc_max(&s->y))
		goto err;
	if (!bn_alloc_max(&s->x))
		goto err;
	return TEE_SUCCESS;
err:
	crypto_bignum_free(s->g);
	crypto_bignum_free(s->p);
	crypto_bignum_free(s->q);
	crypto_bignum_free(s->y);
	return TEE_ERROR_OUT_OF_MEMORY;
}