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smallstack reduction for wolfSSL_ASN1_INTEGER_to_BN

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This commit is contained in:
Chris Conlon
2022-03-18 09:12:58 -06:00
parent ddc1899d48
commit 64a309e245
1 changed files with 31 additions and 7 deletions
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38
src/ssl.c
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@ -53993,7 +53993,11 @@ int SetIndividualInternal(WOLFSSL_BIGNUM* bn, mp_int* mpi)
WOLFSSL_BIGNUM *wolfSSL_ASN1_INTEGER_to_BN(const WOLFSSL_ASN1_INTEGER *ai,
WOLFSSL_BIGNUM *bn)
{
mp_int mpi;
#ifdef WOLFSSL_SMALL_STACK
mp_int* mpi = NULL;
#else
mp_int mpi[1];
#endif
word32 idx = 0;
int ret;
@ -54003,29 +54007,49 @@ WOLFSSL_BIGNUM *wolfSSL_ASN1_INTEGER_to_BN(const WOLFSSL_ASN1_INTEGER *ai,
return NULL;
}
ret = GetInt(&mpi, ai->data, &idx, ai->dataMax);
#ifdef WOLFSSL_SMALL_STACK
mpi = (mp_int*)XMALLOC(sizeof(mp_int), NULL, DYNAMIC_TYPE_BIGINT);
if (mpi == NULL) {
return NULL;
}
#endif
ret = GetInt(mpi, ai->data, &idx, ai->dataMax);
if (ret != 0) {
#if defined(WOLFSSL_QT) || defined(WOLFSSL_HAPROXY)
ret = mp_init(&mpi); /* must init mpi */
ret = mp_init(mpi); /* must init mpi */
if (ret != MP_OKAY) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(mpi, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return NULL;
}
/* Serial number in QT starts at index 0 of data */
if (mp_read_unsigned_bin(&mpi, (byte*)ai->data, ai->length) != 0) {
mp_clear(&mpi);
if (mp_read_unsigned_bin(mpi, (byte*)ai->data, ai->length) != 0) {
mp_clear(mpi);
#ifdef WOLFSSL_SMALL_STACK
XFREE(mpi, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return NULL;
}
#else
/* expecting ASN1 format for INTEGER */
WOLFSSL_LEAVE("wolfSSL_ASN1_INTEGER_to_BN", ret);
#ifdef WOLFSSL_SMALL_STACK
XFREE(mpi, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return NULL;
#endif
}
/* mp_clear needs called because mpi is copied and causes memory leak with
* --disable-fastmath */
ret = SetIndividualExternal(&bn, &mpi);
mp_clear(&mpi);
ret = SetIndividualExternal(&bn, mpi);
mp_clear(mpi);
#ifdef WOLFSSL_SMALL_STACK
XFREE(mpi, NULL, DYNAMIC_TYPE_BIGINT);
#endif
if (ret != WOLFSSL_SUCCESS) {
return NULL;