Limit access to target dimensions

Author: JimBobSquarePants

ImageSharp.Drawing.sln

@@ -28,7 +28,7 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ISSUE_TEMPLATE", "ISSUE_TEMPLATE", "{FBE8C1AD-5AEC-4514-9B64-091D8E145865}"
 	ProjectSection(SolutionItems) = preProject
 		.github\ISSUE_TEMPLATE\config.yml = .github\ISSUE_TEMPLATE\config.yml
-		.github\ISSUE_TEMPLATE\oss-bug-report.md = .github\ISSUE_TEMPLATE\oss-bug-report.md
+		.github\ISSUE_TEMPLATE\oss-bug-report.yml = .github\ISSUE_TEMPLATE\oss-bug-report.yml
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{815C0625-CD3D-440F-9F80-2D83856AB7AE}"

src/ImageSharp.Drawing/Processing/RecolorBrush.cs

@@ -136,9 +136,17 @@ public RecolorBrushApplicator(
         /// <inheritdoc />
         public override void Apply(Span<float> scanline, int x, int y)
         {
-            Span<float> amounts = this.blenderBuffers.AmountSpan.Slice(0, scanline.Length);
-            Span<TPixel> overlays = this.blenderBuffers.OverlaySpan.Slice(0, scanline.Length);
+            if (x < 0 || y < 0 || x >= this.Target.Width || y >= this.Target.Height)
+            {
+                return;
+            }
+
+            // Limit the scanline to the bounds of the image relative to x.
+            scanline = scanline[..Math.Min(this.Target.Width - x, scanline.Length)];
+            Span<float> amounts = this.blenderBuffers.AmountSpan[..scanline.Length];
+            Span<TPixel> overlays = this.blenderBuffers.OverlaySpan[..scanline.Length];
 
+            int width = this.Target.Width;
             for (int i = 0; i < scanline.Length; i++)
             {
                 amounts[i] = scanline[i] * this.Options.BlendPercentage;