Exit gracefully when running ildasm -nat against unsupported ni file. (#10821)

ildasm -nat only works for fragile native images (ie CoreLib only by default).
Running ildasm -nat against unsupported native images would cause a segmentation fault. This PR checks pNativeHeader->Signature == CORCOMPILE_SIGNATURE and end the program with a meaningful error message.

fix #10247

1 files changed, 7 insertions, 0 deletions

diff --git a/src/ildasm/dasm.cpp b/src/ildasm/dasm.cpp
index 68cfa2abee..3d172f009e 100644
--- a/src/ildasm/dasm.cpp
+++ b/src/ildasm/dasm.cpp
@@ -7370,6 +7370,13 @@ BOOL DumpFile()
         }
         CORCOMPILE_HEADER * pNativeHeader;
         g_pPELoader->getVAforRVA(VAL32(g_CORHeader->ManagedNativeHeader.VirtualAddress), (void**)&pNativeHeader);
+
+        if (pNativeHeader->Signature != CORCOMPILE_SIGNATURE)
+        {
+            printError( g_pFile, "/native only works on NGen images." );
+            goto exit;
+        }
+
         g_pPELoader->getVAforRVA(VAL32(pNativeHeader->ManifestMetaData.VirtualAddress), &g_pMetaData);
         g_cbMetaData = VAL32(pNativeHeader->ManifestMetaData.Size);
     }