Re: [Qemu-trivial] [PATCH] vnc: Clean up vncws_send_handshake_response()

[Tim Hardeck <thardeck@suse.de>]

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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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