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Add some additional NULL checks to prevent segfaults.

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Fixes #14809

PR #14752 attempted to pass the libctx, propq in a few places related to
X509 signing. There were a few places that needed additional NULL checks so that they behavethe same as they did before.

OCSP_basic_sign() was changed to call EVP_DigestSignInit_ex() which passed the parameter EVP_MD_name(dgst). Since dgst can be NULL EVP_MD_name() was segfaulting.
Adding an additional NULL check EVP_MD_name() resolves this issue.

The other NULL checks are required to produce errors rather than
segfaults if the certificate is NULL.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14826)
This commit is contained in:
Shane Lontis 2021-04-12 11:19:21 +10:00
parent 46eee7104d
commit 5c10724387
3 changed files with 9 additions and 3 deletions
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2
crypto/evp/evp_lib.c
View File

@ -701,6 +701,8 @@ const char *EVP_MD_description(const EVP_MD *md)
const char *EVP_MD_name(const EVP_MD *md)
{
if (md == NULL)
return NULL;
if (md->prov != NULL)
return evp_first_name(md->prov, md->name_id);
#ifndef FIPS_MODULE

4
crypto/ocsp/ocsp_srv.c
View File

@ -278,6 +278,8 @@ int OCSP_RESPID_set_by_key_ex(OCSP_RESPID *respid, X509 *cert,
int OCSP_RESPID_set_by_key(OCSP_RESPID *respid, X509 *cert)
{
if (cert == NULL)
return 0;
return OCSP_RESPID_set_by_key_ex(respid, cert, cert->libctx, cert->propq);
}
@ -319,5 +321,7 @@ int OCSP_RESPID_match_ex(OCSP_RESPID *respid, X509 *cert, OSSL_LIB_CTX *libctx,
int OCSP_RESPID_match(OCSP_RESPID *respid, X509 *cert)
{
if (cert == NULL)
return 0;
return OCSP_RESPID_match_ex(respid, cert, cert->libctx, cert->propq);
}

6
crypto/x509/x_crl.c
View File

@ -393,9 +393,9 @@ int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
{
return (ASN1_item_verify_ex(ASN1_ITEM_rptr(X509_CRL_INFO),
&crl->sig_alg, &crl->signature, &crl->crl, NULL,
r, crl->libctx, crl->propq));
return ASN1_item_verify_ex(ASN1_ITEM_rptr(X509_CRL_INFO),
&crl->sig_alg, &crl->signature, &crl->crl, NULL,
r, crl->libctx, crl->propq);
}
static int crl_revoked_issuer_match(X509_CRL *crl, const X509_NAME *nm,