Imported Upstream version 2.0.0.11353upstream/2.0.0.11353

1 files changed, 7 insertions, 1 deletions

diff --git a/src/pal/src/misc/environ.cpp b/src/pal/src/misc/environ.cpp
index fed7b69f38..9fc13467c5 100644
--- a/src/pal/src/misc/environ.cpp
+++ b/src/pal/src/misc/environ.cpp
@@ -218,7 +218,13 @@ GetEnvironmentVariableW(
     }
     else if (size == 0)
     {
-        // handle error in GetEnvironmentVariableA
+        // If size is 0, it either means GetEnvironmentVariableA failed, or that
+        // it succeeded and the value of the variable is empty. Check GetLastError
+        // to determine which. If the call failed, we won't touch the buffer.
+        if (GetLastError() == ERROR_SUCCESS)
+        {
+            *lpBuffer = '\0';
+        }
     }
     else
     {