[PATCH 4/4] Page80/83 data is optional

[Owen Smith <owen.smith@xxxxxxxxxx>]

Check for non-NULL before attempting to free SCSI override data.

Signed-off-by: Owen Smith <owen.smith@xxxxxxxxxx>
---
 src/xenvbd/frontend.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/xenvbd/frontend.c b/src/xenvbd/frontend.c
index d7b2e66..f834cac 100644
--- a/src/xenvbd/frontend.c
+++ b/src/xenvbd/frontend.c
@@ -1368,11 +1368,13 @@ FrontendDisconnect(
 
     Frontend->NumQueues = 0;
 
-    Base64Free(Frontend->Page80.Data);
+    if (Frontend->Page80.Data)
+        Base64Free(Frontend->Page80.Data);
     Frontend->Page80.Data = NULL;
     Frontend->Page80.Size = 0;
 
-    Base64Free(Frontend->Page83.Data);
+    if (Frontend->Page83.Data)
+        Base64Free(Frontend->Page83.Data);
     Frontend->Page83.Data = NULL;
     Frontend->Page83.Size = 0;
 }
@@ -1970,11 +1972,13 @@ FrontendDestroy(
 
     Trace("Target[%d] @ (%d) =====>\n", TargetId, KeGetCurrentIrql());
 
-    Base64Free(Frontend->Page80.Data);
+    if (Frontend->Page80.Data)
+        Base64Free(Frontend->Page80.Data);
     Frontend->Page80.Data = NULL;
     Frontend->Page80.Size = 0;
 
-    Base64Free(Frontend->Page83.Data);
+    if (Frontend->Page83.Data)
+        Base64Free(Frontend->Page83.Data);
     Frontend->Page83.Data = NULL;
     Frontend->Page83.Size = 0;
 
-- 
2.31.1.windows.1