From 391e21d23ddb2e8e93d70261614be36835d518a2 Mon Sep 17 00:00:00 2001
From: Mikolaj Boc <mikolaj.boc@qt.io>
Date: Thu, 24 Nov 2022 17:56:10 +0100
Subject: [PATCH] Avoid a crash on pasting files to text edits
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The mime data object fed to qWasmClipboardPaste in qClipboardPasteTo
might have empty formats. We unconditionally check the first format
nevertheless, which leads to a crash. Avoid feeding empty mime data
to the widget system.

Fixes: QTBUG-108840
Change-Id: If874e973b742d35c16cb8a87194d9d4b8f470801
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
---
 src/plugins/platforms/wasm/qwasmclipboard.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/plugins/platforms/wasm/qwasmclipboard.cpp b/src/plugins/platforms/wasm/qwasmclipboard.cpp
index b8f44c2f637..6959a1a4a5b 100644
--- a/src/plugins/platforms/wasm/qwasmclipboard.cpp
+++ b/src/plugins/platforms/wasm/qwasmclipboard.cpp
@@ -139,7 +139,8 @@ static void qClipboardPasteTo(val dataTransfer)
             } // next item
         }
     }
-    qWasmClipboardPaste(mMimeData);
+    if (!mMimeData->formats().isEmpty())
+        qWasmClipboardPaste(mMimeData);
 }
 
 EMSCRIPTEN_BINDINGS(qtClipboardModule) {