From 3718f2118fe452dc5965839887d0b66489e40d4e Mon Sep 17 00:00:00 2001
From: dajiaohuang <mikewushuwen@outlook.com>
Date: Sun, 4 Oct 2026 10:16:08 +0800
Subject: [PATCH] Validate both AppImage magic bytes

---
 src/util/updatableappimage.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/updatableappimage.cpp b/src/util/updatableappimage.cpp
index 5efc920..cb9faa4 100644
--- a/src/util/updatableappimage.cpp
+++ b/src/util/updatableappimage.cpp
@@ -74,7 +74,7 @@ namespace appimage::update {
         assertIfstreamGood(ifs);
 
         // validate first two bytes are A and I
-        if (magicByte[0] != 'A' && magicByte[1] != 'I') {
+        if (magicByte[0] != 'A' || magicByte[1] != 'I') {
             std::ostringstream oss;
             oss << "Invalid magic bytes: " << (int) magicByte[0] << (int) magicByte[1];
             throw AppImageError(oss.str());