[PATCH 1/3] xenbus/dma: fail on unknown DMA operations version

[david ambu <david.preetham@xxxxxxxxxx>]

Return STATUS_NOT_SUPPORTED instead of ASSERT(FALSE) when an unknown
DMA operations size is encountered, preventing copy with unvalidated size.

Assisted-by: ClaudeCode:claude-sonnet-4-6
Signed-off-by: david ambu <david.preetham@xxxxxxxxxx>
---
 src/xenbus/dma.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/xenbus/dma.c b/src/xenbus/dma.c
index 206143e..07d4540 100644
--- a/src/xenbus/dma.c
+++ b/src/xenbus/dma.c
@@ -1657,7 +1657,10 @@ DmaGetAdapter(
         break;
 
     default:
-        ASSERT(FALSE);
+        Error("Unknown DMA operations size %lu\n",
+              Context->LowerOperations->Size);
+        status = STATUS_NOT_SUPPORTED;
+        goto fail3;
     }
 
     // Copy in the requisite number of operations
@@ -1688,6 +1691,11 @@ DmaGetAdapter(
 done:
     return Adapter;
 
+fail3:
+    Error("fail3\n");
+
+    DmaDestroyContext(Context);
+
 fail2:
     Error("fail2\n");
 
-- 
2.51.0.windows.1