From 668cb74b2af1129349a6c41763bc88d801161e09 Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Mon, 30 Nov 2020 11:56:13 +0100 Subject: crypto: Forbid broken unloading of secrets MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit qcrypto_secret_prop_set_loaded() forgets to reset secret->rawdata after unloading a secret, which will lead to a double free at some point. Because there is no use case for unloading an already loaded secret (apart from deleting the whole secret object) and we know that nobody could use this because it would lead to crashes, let's just forbid the operation instead of fixing the unloading. Eventually, we'll want to get rid of 'loaded' in the external interface, but for the meantime this is more consistent with rng, which has a similar property 'opened' that also can't be reset to false after it became true. Signed-off-by: Kevin Wolf Signed-off-by: Daniel P. Berrangé --- crypto/secret_common.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/crypto/secret_common.c b/crypto/secret_common.c index 35b82cb531..714a15d5e5 100644 --- a/crypto/secret_common.c +++ b/crypto/secret_common.c @@ -191,9 +191,9 @@ qcrypto_secret_prop_set_loaded(Object *obj, secret->rawdata = input; secret->rawlen = inputlen; - } else { - g_free(secret->rawdata); - secret->rawlen = 0; + } else if (secret->rawdata) { + error_setg(errp, "Cannot unload secret"); + return; } } -- cgit v1.2.3