From 9c772a64a1bcbc088208183d8fcb0b8a03b8b708 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sat, 25 Apr 2020 17:03:40 +0200
Subject: [PATCH] LibGfx: Don't proceed with GIF format sniffing if stream read
 fails

---
 Libraries/LibGfx/GIFLoader.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Libraries/LibGfx/GIFLoader.cpp b/Libraries/LibGfx/GIFLoader.cpp
index 91497430ee0..ad5c0ae42ab 100644
--- a/Libraries/LibGfx/GIFLoader.cpp
+++ b/Libraries/LibGfx/GIFLoader.cpp
@@ -111,6 +111,9 @@ Optional<GIFFormat> decode_gif_header(BufferStream& stream)
     for (int i = 0; i < 6; ++i)
         stream >> header[i];
 
+    if (stream.handle_read_failure())
+        return {};
+
     if (!memcmp(header, valid_header_87, sizeof(header)))
         return GIFFormat::GIF87a;
     else if (!memcmp(header, valid_header_89, sizeof(header)))