From cd4ed152148178a4550779f2ddab7b2ae165f2e5 Mon Sep 17 00:00:00 2001
From: RustDesk <71636191+rustdesk@users.noreply.github.com>
Date: Sat, 4 Jul 2026 14:55:09 +0800
Subject: [PATCH] Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
---
 libs/clipboard/src/windows/wf_cliprdr.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/libs/clipboard/src/windows/wf_cliprdr.c b/libs/clipboard/src/windows/wf_cliprdr.c
index 6927bcc57..1f3791dff 100644
--- a/libs/clipboard/src/windows/wf_cliprdr.c
+++ b/libs/clipboard/src/windows/wf_cliprdr.c
@@ -479,12 +479,14 @@ static HRESULT STDMETHODCALLTYPE CliprdrStream_Read(IStream *This, void *pv, ULO
 		return STG_E_READFAULT;
 	}
 
-	// A successful request must have produced a buffer. If it did not, fail the
-	// read instead of reporting stale or uninitialized bytes to the caller.
-	if (!req_data)
-		return E_FAIL;
-
-	CopyMemory(pv, req_data, req_size);
+	// A successful request may legitimately return 0 bytes (EOF); only treat a NULL
+	// buffer as an error when a non-zero size was reported.
+	if (req_size > 0)
+	{
+		if (!req_data)
+			return E_FAIL;
+		CopyMemory(pv, req_data, req_size);
+	}
 	free(req_data);
 
 	*pcbRead = req_size;