[PATCH] conhost: Fix status for READ_CONSOLE ioctl

[Keno Fischer]

Without this patch conhost would attempt to process non-existent input,
spewing stdout with various cursor moves and incorrectly returning
the ReadConsole call early. Fix that by only attempting input processing
if there are actually input records to be processed and properly
returning STATUS_PENDING if the input processing is not yet complete.

Signed-off-by: Keno Fischer <keno at juliacomputing.com>
---
 programs/conhost/conhost.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/programs/conhost/conhost.c b/programs/conhost/conhost.c
index 78f6e345170..64a77e52b43 100644
--- a/programs/conhost/conhost.c
+++ b/programs/conhost/conhost.c
@@ -1385,7 +1385,14 @@ static NTSTATUS read_console( struct console *console, unsigned int ioctl, size_
     if (edit_line_grow( console, 1 )) console->edit_line.buf[0] = 0;
 
     console->pending_read = out_size;
-    return process_console_input( console );
+
+    /* If there are any pending input records, cook them now. */
+    if (console->record_count)
+    {
+        process_console_input( console );
+    }
+
+    return console->edit_line.status;
 }
 
 /* add input events to a console input queue */
-- 
2.25.1