Juan Lang : cryptui: Don' t crash displaying a certificate hierarchy when the certificate' s signer isn't found.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: d48a56db5cc99358fd181eb14083a4189370150c
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=d48a56db5cc99358fd181eb14083a4189370150c

Author: Juan Lang <juan.lang at gmail.com>
Date:   Wed Oct  6 11:39:58 2010 -0700

cryptui: Don't crash displaying a certificate hierarchy when the certificate's signer isn't found.

Spotted by André Hentschel.

---

 dlls/cryptui/main.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/cryptui/main.c b/dlls/cryptui/main.c
index 339ad61..3a8f8f8 100644
--- a/dlls/cryptui/main.c
+++ b/dlls/cryptui/main.c
@@ -4040,8 +4040,8 @@ static void show_cert_chain(HWND hwnd, struct hierarchy_data *data)
             tvis.u.item.pszText = name;
             tvis.u.item.state = TVIS_EXPANDED;
             tvis.u.item.stateMask = TVIS_EXPANDED;
-            if (i == 1 &&
-             (provSigner->pChainContext->TrustStatus.dwErrorStatus &
+            if (i == 1 && (!provSigner->pChainContext ||
+             provSigner->pChainContext->TrustStatus.dwErrorStatus &
              CERT_TRUST_IS_PARTIAL_CHAIN))
             {
                 /* The root of the chain has a special case:  if the chain is