fix infinite tests

fuzz_crashes_test.go

@@ -28,8 +28,7 @@ func TestCrash1(t *testing.T) {
 	}
 }
 
-// TODO: this enters infinite loop
-func NoTestInfinite1(t *testing.T) {
+func TestInfinite1(t *testing.T) {
 	test := "[[[[[[\n\t: ]]]]]]\n\n: " + "\n\n:(()"
 	c := make(chan bool, 1)
 	go func() {
@@ -77,7 +76,7 @@ main.main()
 	go.fuzz.main/main.go:10 +0x2d fp=0xc42049df80 sp=0xc42049df68 pc=0x1118dad
 runtime.main()
 */
-func NoTestInfinite2(t *testing.T) {
+func TestInfinite2(t *testing.T) {
 	test := ":\x00\x00\x00\x01V\n>* \x00\x80e\n\t* \n\n:\t"
 
 	c := make(chan bool, 1)

parser/block.go

@@ -244,7 +244,8 @@ func (p *Parser) block(data []byte) {
 
 		// anything else must look like a normal paragraph
 		// note: this finds underlined headings, too
-		data = data[p.paragraph(data):]
+		idx := p.paragraph(data)
+		data = data[idx:]
 	}
 
 	p.nesting--
@@ -1479,7 +1480,8 @@ func (p *Parser) paragraph(data []byte) int {
 			// did this blank line followed by a definition list item?
 			if p.extensions&DefinitionLists != 0 {
 				if i < len(data)-1 && data[i+1] == ':' {
-					return p.list(data[prev:], ast.ListTypeDefinition)
+					listLen := p.list(data[prev:], ast.ListTypeDefinition)
+					return prev + listLen
 				}
 			}