Hi Markus, thanks for your input.
On Wed, 2013-01-23 at 18:16 +0100, Markus Armbruster wrote:
> Use appropriate types, drop superfluous casts, use sizeof, don't
> exploit that this particular call of gnutls_fingerprint() doesn't
> change its last argument.
your patch does work fine but if we expect gnutls_fingerprint to change
the hash_size there has to be an additional check if the hash_size is
bigger than SHA1_DIGEST_LEN.
For example:
diff --git a/ui/vnc-ws.c b/ui/vnc-ws.c
index de7e74c..e64c895 100644
--- a/ui/vnc-ws.c
+++ b/ui/vnc-ws.c
@@ -132,7 +132,7 @@ static void vncws_send_handshake_response(VncState
*vs, const char* key)
in.data = (void *)combined_key;
in.size = WS_CLIENT_KEY_LEN + WS_GUID_LEN;
if (gnutls_fingerprint(GNUTLS_DIG_SHA1, &in, hash, &hash_size)
- == GNUTLS_E_SUCCESS) {
+ == GNUTLS_E_SUCCESS && hash_size <= SHA1_DIGEST_LEN) {
accept = g_base64_encode(hash, hash_size);
}
if (accept == NULL) {
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