From fd14edc9bc4a2c4d493985f7afd56da7b78c61d9 Mon Sep 17 00:00:00 2001
From: Andrew Morozko <github-msgs-web@bitnotes.xyz>
Date: Thu, 15 Aug 2024 23:38:43 +0400
Subject: [PATCH] Fix panic in table parser

---
 extension/table.go      |  4 ++--
 extension/table_test.go | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/extension/table.go b/extension/table.go
index 617c7a3..c67a1e4 100644
--- a/extension/table.go
+++ b/extension/table.go
@@ -184,11 +184,11 @@ func (b *tableParagraphTransformer) Transform(node *gast.Paragraph, reader text.
 func (b *tableParagraphTransformer) parseRow(segment text.Segment,
 	alignments []ast.Alignment, isHeader bool, reader text.Reader, pc parser.Context) *ast.TableRow {
 	source := reader.Source()
+	segment = segment.TrimLeftSpace(source)
+	segment = segment.TrimRightSpace(source)
 	line := segment.Value(source)
 	pos := 0
-	pos += util.TrimLeftSpaceLength(line)
 	limit := len(line)
-	limit -= util.TrimRightSpaceLength(line)
 	row := ast.NewTableRow(alignments)
 	if len(line) > 0 && line[pos] == '|' {
 		pos++
diff --git a/extension/table_test.go b/extension/table_test.go
index 5ee23e9..21a4663 100644
--- a/extension/table_test.go
+++ b/extension/table_test.go
@@ -355,3 +355,40 @@ bar | baz
 		t,
 	)
 }
+
+func TestTableFuzzedPanics(t *testing.T) {
+	markdown := goldmark.New(
+		goldmark.WithRendererOptions(
+			html.WithXHTML(),
+			html.WithUnsafe(),
+		),
+		goldmark.WithExtensions(
+			NewTable(),
+		),
+	)
+	testutil.DoTestCase(
+		markdown,
+		testutil.MarkdownTestCase{
+			No:          1,
+			Description: "This should not panic",
+			Markdown:    "* 0\n-|\n\t0",
+			Expected: `<ul>
+<li>
+<table>
+<thead>
+<tr>
+<th>0</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>0</td>
+</tr>
+</tbody>
+</table>
+</li>
+</ul>`,
+		},
+		t,
+	)
+}