crypto: avoid passing NULL to access() syscall

The qcrypto_tls_creds_x509_sanity_check() checks whether
certs exist by calling access(). It is valid for this
method to be invoked with certfile==NULL though, since
for client credentials the cert is optional. This caused
it to call access(NULL), which happens to be harmless on
current Linux, but should none the less be avoided.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/crypto/tlscredsx509.c b/crypto/tlscredsx509.c
index c5d1a0de30..d080deb83e 100644
--- a/crypto/tlscredsx509.c
+++ b/crypto/tlscredsx509.c
@@ -485,7 +485,8 @@ qcrypto_tls_creds_x509_sanity_check(QCryptoTLSCredsX509 *creds,
     int ret = -1;
 
     memset(cacerts, 0, sizeof(cacerts));
-    if (access(certFile, R_OK) == 0) {
+    if (certFile &&
+        access(certFile, R_OK) == 0) {
         cert = qcrypto_tls_creds_load_cert(creds,
                                            certFile, isServer,
                                            errp);