[libvirt] [PATCH] storage: Properly terminate secrets

[Michal Privoznik]

The virSecretGetSecretString() helper looks up a secret for given
pool and returns its value in @secret_value and its length in
@secret_value_size. However, the trailing '\0' is not included in
either of the variables. This is because usually the value of the
secret is passed to some encoder (usually base64 encoder) where
the trailing zero must not be accounted for.

However, in two places we actually want the string as we don't
process is any further.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---

I wonder if putting this realloc into virSecretGetSecretString() would
be a better fix or not. I mean, without changing @secret_size. Opinions?

 src/storage/storage_backend_iscsi.c        | 5 +++++
 src/storage/storage_backend_iscsi_direct.c | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/src/storage/storage_backend_iscsi.c b/src/storage/storage_backend_iscsi.c
index 6242cd0fac..55fe47f5e1 100644
--- a/src/storage/storage_backend_iscsi.c
+++ b/src/storage/storage_backend_iscsi.c
@@ -303,6 +303,11 @@ virStorageBackendISCSISetAuth(const char *portal,
                                  &secret_value, &secret_size) < 0)
         goto cleanup;
 
+    if (VIR_REALLOC_N(secret_value, secret_size + 1) < 0)
+        goto cleanup;
+
+    secret_value[secret_size] = '\0';
+
     if (virISCSINodeUpdate(portal,
                            source->devices[0].path,
                            "node.session.auth.authmethod",
diff --git a/src/storage/storage_backend_iscsi_direct.c b/src/storage/storage_backend_iscsi_direct.c
index 1624066e9c..0d7d6ba9c3 100644
--- a/src/storage/storage_backend_iscsi_direct.c
+++ b/src/storage/storage_backend_iscsi_direct.c
@@ -115,6 +115,11 @@ virStorageBackendISCSIDirectSetAuth(struct iscsi_context *iscsi,
                                  &secret_value, &secret_size) < 0)
         goto cleanup;
 
+    if (VIR_REALLOC_N(secret_value, secret_size + 1) < 0)
+        goto cleanup;
+
+    secret_value[secret_size] = '\0';
+
     if (iscsi_set_initiator_username_pwd(iscsi,
                                          authdef->username,
                                          (const char *)secret_value) < 0) {
-- 
2.16.4