From aac680fea60968320220c09492d8aa6216910295 Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Sun, 27 Mar 2022 19:28:03 +0200
Subject: [PATCH] Add check, if enough data was read for progressive scan
 decoding data

---
 src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs b/src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs
index 41effc865d..56bdca5f8d 100644
--- a/src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs
+++ b/src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs
@@ -1334,8 +1334,12 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 component.ACHuffmanTableId = acTableIndex;
             }
 
-            // 3 bytes: Progressive scan decoding data
-            stream.Read(this.temp, 0, 3);
+            // 3 bytes: Progressive scan decoding data.
+            int bytesRead = stream.Read(this.temp, 0, 3);
+            if (bytesRead != 3)
+            {
+                JpegThrowHelper.ThrowInvalidImageContentException("Not enough data to read progressive scan decoding data");
+            }
 
             int spectralStart = this.temp[0];
             this.scanDecoder.SpectralStart = spectralStart;