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qemuDomainMasterKeyCreate: Don't use VIR_DISPOSE_N on failure

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When virRandomBytes fails we don't get any random bytes and even if we
did they don't have to be treated as secret as they weren't used in any
way.

Add a temporary variable with automatic freeing for the secret buffer
and assign it only on success.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Peter Krempa 2021-02-01 12:52:07 +01:00
parent b57b6b4eea
commit ac4b55c99d
1 changed files with 6 additions and 5 deletions
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11
src/qemu/qemu_domain.c
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@ -562,18 +562,19 @@ int
qemuDomainMasterKeyCreate(virDomainObjPtr vm)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
g_autofree uint8_t *key = NULL;
/* If we don't have the capability, then do nothing. */
if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_OBJECT_SECRET))
return 0;
priv->masterKey = g_new0(uint8_t, QEMU_DOMAIN_MASTER_KEY_LEN);
priv->masterKeyLen = QEMU_DOMAIN_MASTER_KEY_LEN;
key = g_new0(uint8_t, QEMU_DOMAIN_MASTER_KEY_LEN);
if (virRandomBytes(priv->masterKey, priv->masterKeyLen) < 0) {
VIR_DISPOSE_N(priv->masterKey, priv->masterKeyLen);
if (virRandomBytes(key, QEMU_DOMAIN_MASTER_KEY_LEN) < 0)
return -1;
}
priv->masterKey = g_steal_pointer(&key);
priv->masterKeyLen = QEMU_DOMAIN_MASTER_KEY_LEN;
return 0;
}