[Qemu-devel] [PATCH 31/67] char: fix missing return in error path for chardev TLS init

[Michael Roth]

From: "Daniel P. Berrange" <address@hidden>

If the qio_channel_tls_new_(server|client) methods fail,
we disconnect the client. Unfortunately a missing return
means we then go on to try and run the TLS handshake on
a NULL I/O channel. This gives predictably segfaulty
results.

The main way to trigger this is to request a bogus TLS
priority string for the TLS credentials. e.g.

  -object tls-creds-x509,id=tls0,priority=wibble,...

Most other ways appear impossible to trigger except
perhaps if OOM conditions cause gnutls initialization
to fail.

Signed-off-by: Daniel P. Berrange <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Michael Tokarev <address@hidden>
(cherry picked from commit 660a2d83e026496db6b3eaec2256a2cdd6c74de8)
Signed-off-by: Michael Roth <address@hidden>
---
 qemu-char.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/qemu-char.c b/qemu-char.c
index fdb23f5..90e9627 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -3096,6 +3096,7 @@ static void tcp_chr_tls_init(CharDriverState *chr)
     if (tioc == NULL) {
         error_free(err);
         tcp_chr_disconnect(chr);
+        return;
     }
     object_unref(OBJECT(s->ioc));
     s->ioc = QIO_CHANNEL(tioc);
-- 
1.9.1