Add check for span length in parse png physical chunk

src/ImageSharp/Formats/Png/Chunks/PngPhysical.cs

@@ -46,6 +46,11 @@ internal readonly struct PngPhysical
     /// <returns>The parsed PhysicalChunkData.</returns>
     public static PngPhysical Parse(ReadOnlySpan<byte> data)
     {
+        if (data.Length < 9)
+        {
+            PngThrowHelper.ThrowInvalidImageContentException("pHYs chunk is too short");
+        }
+
         uint hResolution = BinaryPrimitives.ReadUInt32BigEndian(data[..4]);
         uint vResolution = BinaryPrimitives.ReadUInt32BigEndian(data.Slice(4, 4));
         byte unit = data[8];

src/ImageSharp/Formats/Png/PngThrowHelper.cs

@@ -9,8 +9,7 @@ namespace SixLabors.ImageSharp.Formats.Png;
 internal static class PngThrowHelper
 {
     [DoesNotReturn]
-    public static void ThrowInvalidImageContentException(string errorMessage, Exception innerException)
+    public static void ThrowInvalidImageContentException(string errorMessage) => throw new InvalidImageContentException(errorMessage);
-        => throw new InvalidImageContentException(errorMessage, innerException);
 
     [DoesNotReturn]
     public static void ThrowInvalidHeader() => throw new InvalidImageContentException("PNG Image must contain a header chunk and it must be located before any other chunks.");