[libvirt] [PATCH v2 1/2] rpc: cleanup in virNetTLSContextNew

[Adrian Brzezinski]

Failed new gnutls context allocations in virNetTLSContextNew function
results in double free and segfault. Occasional memory leaks may also
occur.

Signed-off-by: Adrian Brzezinski <redhat at adrb.pl>
---
 src/rpc/virnettlscontext.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
index 72e9ed9..7b5d578 100644
--- a/src/rpc/virnettlscontext.c
+++ b/src/rpc/virnettlscontext.c
@@ -707,6 +707,12 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
 
     err = gnutls_certificate_allocate_credentials(&ctxt->x509cred);
     if (err) {
+       /* gnutls_certificate_credentials_t is complex structure with multiple
+        * internal memory allocatons that can go wrong, so make sure that
+        * reference is NULL.
+        */
+        ctxt->x509cred = NULL;
+
         virReportError(VIR_ERR_SYSTEM_ERROR,
                        _("Unable to allocate x509 credentials: %s"),
                        gnutls_strerror(err));
@@ -758,7 +764,9 @@ static virNetTLSContextPtr virNetTLSContextNew(const char *cacert,
  error:
     if (isServer)
         gnutls_dh_params_deinit(ctxt->dhParams);
-    gnutls_certificate_free_credentials(ctxt->x509cred);
+    if (ctxt->x509cred)
+        gnutls_certificate_free_credentials(ctxt->x509cred);
+    VIR_FREE(ctxt->priority);
     VIR_FREE(ctxt);
     return NULL;
 }
-- 
1.8.3.1