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[v8.0/forgejo] Don't panic on empty blockquote
- Backport #4602
- On a empty blockquote the callout feature would panic, as it expects
to always have at least one child.
- This panic cannot result in a DoS, because any panic that happens
while rendering any markdown input will be recovered gracefully.
- Adds a simple condition to avoid this panic.
(cherry picked from commit efd63ec1d8
)
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3 changed files with 22 additions and 0 deletions
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@ -25,6 +25,10 @@ func (g *GitHubLegacyCalloutTransformer) Transform(node *ast.Document, reader te
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switch v := n.(type) {
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case *ast.Blockquote:
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if v.ChildCount() == 0 {
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return ast.WalkContinue, nil
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}
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// The first paragraph contains the callout type.
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firstParagraph := v.FirstChild()
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if firstParagraph.ChildCount() < 1 {
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