check disposed buffers for decoders

src/ImageSharp/Formats/Bmp/BmpDecoderCore.cs

@@ -122,11 +122,12 @@ namespace SixLabors.ImageSharp.Formats.Bmp
         public Image<TPixel> Decode<TPixel>(BufferedReadStream stream, CancellationToken cancellationToken)
             where TPixel : unmanaged, IPixel<TPixel>
         {
+            Image<TPixel> image = null;
             try
             {
                 int bytesPerColorMapEntry = this.ReadImageHeaders(stream, out bool inverted, out byte[] palette);
 
-                var image = new Image<TPixel>(this.Configuration, this.infoHeader.Width, this.infoHeader.Height, this.metadata);
+                image = new Image<TPixel>(this.Configuration, this.infoHeader.Width, this.infoHeader.Height, this.metadata);
 
                 Buffer2D<TPixel> pixels = image.GetRootFramePixelBuffer();
 
@@ -193,8 +194,14 @@ namespace SixLabors.ImageSharp.Formats.Bmp
             }
             catch (IndexOutOfRangeException e)
             {
+                image?.Dispose();
                 throw new ImageFormatException("Bitmap does not have a valid format.", e);
             }
+            catch
+            {
+                image?.Dispose();
+                throw;
+            }
         }
 
         /// <inheritdoc />

src/ImageSharp/Formats/Gif/GifDecoderCore.cs

@@ -151,6 +151,11 @@ namespace SixLabors.ImageSharp.Formats.Gif
                     }
                 }
             }
+            //catch
+            //{
+            //    image?.Dispose();
+            //    throw;
+            //}
             finally
             {
                 this.globalColorTable?.Dispose();

src/ImageSharp/Formats/Tiff/Compression/Decompressors/JpegTiffCompression.cs

@@ -65,7 +65,8 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Compression.Decompressors
                         jpegDecoder.ParseStream(stream, scanDecoderGray, CancellationToken.None);
 
                         // TODO: Should we pass through the CancellationToken from the tiff decoder?
-                        CopyImageBytesToBuffer(buffer, spectralConverterGray.GetPixelBuffer(CancellationToken.None));
+                        using var decompressedBuffer = spectralConverterGray.GetPixelBuffer(CancellationToken.None);
+                        CopyImageBytesToBuffer(buffer, decompressedBuffer);
                         break;
                     }
 
@@ -81,7 +82,8 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Compression.Decompressors
                         jpegDecoder.ParseStream(stream, scanDecoder, CancellationToken.None);
 
                         // TODO: Should we pass through the CancellationToken from the tiff decoder?
-                        CopyImageBytesToBuffer(buffer, spectralConverter.GetPixelBuffer(CancellationToken.None));
+                        using var decompressedBuffer = spectralConverter.GetPixelBuffer(CancellationToken.None);
+                        CopyImageBytesToBuffer(buffer, decompressedBuffer);
                         break;
                     }
 

src/ImageSharp/Formats/Tiff/TiffDecoderCore.cs

@@ -240,8 +240,8 @@ namespace SixLabors.ImageSharp.Formats.Tiff
             var stripOffsetsArray = (Array)tags.GetValueInternal(ExifTag.StripOffsets).GetValue();
             var stripByteCountsArray = (Array)tags.GetValueInternal(ExifTag.StripByteCounts).GetValue();
 
-            IMemoryOwner<ulong> stripOffsetsMemory = this.ConvertNumbers(stripOffsetsArray, out Span<ulong> stripOffsets);
-            IMemoryOwner<ulong> stripByteCountsMemory = this.ConvertNumbers(stripByteCountsArray, out Span<ulong> stripByteCounts);
+            using IMemoryOwner<ulong> stripOffsetsMemory = this.ConvertNumbers(stripOffsetsArray, out Span<ulong> stripOffsets);
+            using IMemoryOwner<ulong> stripByteCountsMemory = this.ConvertNumbers(stripByteCountsArray, out Span<ulong> stripByteCounts);
 
             if (this.PlanarConfiguration == TiffPlanarConfiguration.Planar)
             {
@@ -262,8 +262,6 @@ namespace SixLabors.ImageSharp.Formats.Tiff
                     cancellationToken);
             }
 
-            stripOffsetsMemory?.Dispose();
-            stripByteCountsMemory?.Dispose();
             return frame;
         }
 

src/ImageSharp/Formats/Webp/WebpDecoderCore.cs

@@ -82,38 +82,48 @@ namespace SixLabors.ImageSharp.Formats.Webp
         public Image<TPixel> Decode<TPixel>(BufferedReadStream stream, CancellationToken cancellationToken)
             where TPixel : unmanaged, IPixel<TPixel>
         {
-            this.Metadata = new ImageMetadata();
-            this.currentStream = stream;
+            Image<TPixel> image = null;
+            try
+            {
 
-            uint fileSize = this.ReadImageHeader();
+                this.Metadata = new ImageMetadata();
+                this.currentStream = stream;
 
-            using (this.webImageInfo = this.ReadVp8Info())
-            {
-                if (this.webImageInfo.Features is { Animation: true })
-                {
-                    WebpThrowHelper.ThrowNotSupportedException("Animations are not supported");
-                }
+                uint fileSize = this.ReadImageHeader();
 
-                var image = new Image<TPixel>(this.Configuration, (int)this.webImageInfo.Width, (int)this.webImageInfo.Height, this.Metadata);
-                Buffer2D<TPixel> pixels = image.GetRootFramePixelBuffer();
-                if (this.webImageInfo.IsLossless)
+                using (this.webImageInfo = this.ReadVp8Info())
                 {
-                    var losslessDecoder = new WebpLosslessDecoder(this.webImageInfo.Vp8LBitReader, this.memoryAllocator, this.Configuration);
-                    losslessDecoder.Decode(pixels, image.Width, image.Height);
-                }
-                else
-                {
-                    var lossyDecoder = new WebpLossyDecoder(this.webImageInfo.Vp8BitReader, this.memoryAllocator, this.Configuration);
-                    lossyDecoder.Decode(pixels, image.Width, image.Height, this.webImageInfo);
-                }
+                    if (this.webImageInfo.Features is { Animation: true })
+                    {
+                        WebpThrowHelper.ThrowNotSupportedException("Animations are not supported");
+                    }
 
-                // There can be optional chunks after the image data, like EXIF and XMP.
-                if (this.webImageInfo.Features != null)
-                {
-                    this.ParseOptionalChunks(this.webImageInfo.Features);
-                }
+                    image = new Image<TPixel>(this.Configuration, (int)this.webImageInfo.Width, (int)this.webImageInfo.Height, this.Metadata);
+                    Buffer2D<TPixel> pixels = image.GetRootFramePixelBuffer();
+                    if (this.webImageInfo.IsLossless)
+                    {
+                        var losslessDecoder = new WebpLosslessDecoder(this.webImageInfo.Vp8LBitReader, this.memoryAllocator, this.Configuration);
+                        losslessDecoder.Decode(pixels, image.Width, image.Height);
+                    }
+                    else
+                    {
+                        var lossyDecoder = new WebpLossyDecoder(this.webImageInfo.Vp8BitReader, this.memoryAllocator, this.Configuration);
+                        lossyDecoder.Decode(pixels, image.Width, image.Height, this.webImageInfo);
+                    }
 
-                return image;
+                    // There can be optional chunks after the image data, like EXIF and XMP.
+                    if (this.webImageInfo.Features != null)
+                    {
+                        this.ParseOptionalChunks(this.webImageInfo.Features);
+                    }
+
+                    return image;
+                }
+            }
+            catch
+            {
+                image?.Dispose();
+                throw;
             }
         }
 

tests/ImageSharp.Tests/Formats/Bmp/BmpDecoderTests.cs

@@ -20,6 +20,7 @@ using static SixLabors.ImageSharp.Tests.TestImages.Bmp;
 namespace SixLabors.ImageSharp.Tests.Formats.Bmp
 {
     [Trait("Format", "Bmp")]
+    [ValidateDisposedMemoryAllocations]
     public class BmpDecoderTests
     {
         public const PixelTypes CommonNonDefaultPixelTypes = PixelTypes.Rgba32 | PixelTypes.Bgra32 | PixelTypes.RgbaVector;

tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs

@@ -18,6 +18,7 @@ using Xunit;
 namespace SixLabors.ImageSharp.Tests.Formats.Gif
 {
     [Trait("Format", "Gif")]
+    [ValidateDisposedMemoryAllocations]
     public class GifDecoderTests
     {
         private const PixelTypes TestPixelTypes = PixelTypes.Rgba32 | PixelTypes.RgbaVector | PixelTypes.Argb32;

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Metadata.cs

@@ -179,11 +179,16 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             var testFile = TestFile.Create(imagePath);
             using (var stream = new MemoryStream(testFile.Bytes, false))
             {
-                IImageInfo imageInfo = useIdentify
-                ? ((IImageInfoDetector)decoder).Identify(Configuration.Default, stream, default)
-                : decoder.Decode<Rgba32>(Configuration.Default, stream, default);
-
-                test(imageInfo);
+                if (useIdentify)
+                {
+                    IImageInfo imageInfo = ((IImageInfoDetector)decoder).Identify(Configuration.Default, stream, default);
+                    test(imageInfo);
+                }
+                else
+                {
+                    using var img = decoder.Decode<Rgba32>(Configuration.Default, stream, default);
+                    test(img);
+                }
             }
         }
 

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.cs

@@ -22,6 +22,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 {
     // TODO: Scatter test cases into multiple test classes
     [Trait("Format", "Jpg")]
+    [ValidateDisposedMemoryAllocations]
     public partial class JpegDecoderTests
     {
         public const PixelTypes CommonNonDefaultPixelTypes = PixelTypes.Rgba32 | PixelTypes.Argb32 | PixelTypes.Bgr24 | PixelTypes.RgbaVector;

tests/ImageSharp.Tests/Formats/Pbm/PbmDecoderTests.cs

@@ -11,6 +11,7 @@ using static SixLabors.ImageSharp.Tests.TestImages.Pbm;
 namespace SixLabors.ImageSharp.Tests.Formats.Pbm
 {
     [Trait("Format", "Pbm")]
+    [ValidateDisposedMemoryAllocations]
     public class PbmDecoderTests
     {
         [Theory]

tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs

@@ -19,6 +19,7 @@ using Xunit;
 namespace SixLabors.ImageSharp.Tests.Formats.Png
 {
     [Trait("Format", "Png")]
+    [ValidateDisposedMemoryAllocations]
     public partial class PngDecoderTests
     {
         private const PixelTypes TestPixelTypes = PixelTypes.Rgba32 | PixelTypes.RgbaVector | PixelTypes.Argb32;
@@ -103,7 +104,6 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
 
         [Theory]
         [WithFileCollection(nameof(CommonTestImages), PixelTypes.Rgba32)]
-        [ValidateDisposedMemoryAllocations]
         public void Decode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel>
         {

tests/ImageSharp.Tests/Formats/Tga/TgaDecoderTests.cs

@@ -16,6 +16,7 @@ using static SixLabors.ImageSharp.Tests.TestImages.Tga;
 namespace SixLabors.ImageSharp.Tests.Formats.Tga
 {
     [Trait("Format", "Tga")]
+    [ValidateDisposedMemoryAllocations]
     public class TgaDecoderTests
     {
         private static TgaDecoder TgaDecoder => new();

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -14,6 +14,7 @@ using static SixLabors.ImageSharp.Tests.TestImages.Tiff;
 namespace SixLabors.ImageSharp.Tests.Formats.Tiff
 {
     [Trait("Format", "Tiff")]
+    [ValidateDisposedMemoryAllocations]
     public class TiffDecoderTests : TiffDecoderBaseTester
     {
         public static readonly string[] MultiframeTestImages = Multiframes;

tests/ImageSharp.Tests/Formats/WebP/WebpDecoderTests.cs

@@ -13,6 +13,7 @@ using static SixLabors.ImageSharp.Tests.TestImages.Webp;
 namespace SixLabors.ImageSharp.Tests.Formats.Webp
 {
     [Trait("Format", "Webp")]
+    [ValidateDisposedMemoryAllocations]
     public class WebpDecoderTests
     {
         private static WebpDecoder WebpDecoder => new();

tests/ImageSharp.Tests/TestUtilities/ImageComparison/ImageComparingUtils.cs

@@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison
             }
 
             var testFile = TestFile.Create(path);
-            Image<Rgba32> magickImage = DecodeWithMagick<Rgba32>(new FileInfo(testFile.FullPath));
+            using Image<Rgba32> magickImage = DecodeWithMagick<Rgba32>(new FileInfo(testFile.FullPath));
             if (useExactComparer)
             {
                 ImageComparer.Exact.VerifySimilarity(magickImage, image);