Fuzz crash on "0000000000000000000000000000000000000\n:\t```\n\t\t0"

[chibataiki]

goldmark has https://github.com/yuin/goldmark/discussions in github. You should post only issues here. Feature requests and questions should be posted at discussions.

• [x] goldmark is fully compliant with the CommonMark. Before submitting issue, you must read CommonMark spec and confirm your output is different from CommonMark online demo.
  • [x] Extensions(Autolink without < >, Table, etc) are not part of CommonMark spec. You should confirm your output is different from other official renderers correspond with an extension.
• [x] goldmark is not dedicated for Hugo. If you are Hugo user and your issue was raised by your experience in Hugo, you should consider create issue at Hugo repository at first .

Please answer the following before submitting your issue:

1. What version of goldmark are you using? : 1.3.3
2. What version of Go are you using? : go1.13.8
3. What operating system and processor architecture are you using? : ubuntu 20.04 amd64
4. What did you do? : make fuzz
5. What did you expect to see? : fine
6. What did you see instead? :

goldmark/fuzz/crashers ‹master*› » cat 026e3dc9902bf39a6aba2a3c13b668f3ddf0fa32.quoted
    "00000000000000000000" +
    "00000000000000000\n:\t" +
    "```\n\t\t0"

cat 026e3dc9902bf39a6aba2a3c13b668f3ddf0fa32.output
panic: runtime error: slice bounds out of range [49:47]

goroutine 1 [running]:
github.com/yuin/goldmark/text.(*Segment).Value(0xc0002839f0, 0x7f192c2bb000, 0x2f, 0x2f, 0xc000013a08, 0x61f96c, 0xc0002a3038)
    /home/fuzz_target_go/goldmark/text/segment.go:48 +0x32d
github.com/yuin/goldmark/renderer/html.(*Renderer).writeLines(0xc0002a0200, 0x71c8a0, 0xc0001ff900, 0x7f192c2bb000, 0x2f, 0x2f, 0x71dd60, 0xc0002863c0)
    /home/fuzz_target_go/goldmark/renderer/html/html.go:193 +0x113
github.com/yuin/goldmark/renderer/html.(*Renderer).renderFencedCodeBlock(0xc0002a0200, 0x71c8a0, 0xc0001ff900, 0x7f192c2bb000, 0x2f, 0x2f, 0x71dd60, 0xc0002863c0, 0x1, 0xc000283b38, ...)
    /home/fuzz_target_go/goldmark/renderer/html/html.go:285 +0x19d
github.com/yuin/goldmark/renderer.(*renderer).Render.func2(0x71dd60, 0xc0002863c0, 0x1, 0x0, 0x0, 0x71c8a0)
    /home/fuzz_target_go/goldmark/renderer/renderer.go:166 +0x16a
github.com/yuin/goldmark/ast.walkHelper(0x71dd60, 0xc0002863c0, 0xc000283d28, 0x3, 0x0, 0x0)
    /home/fuzz_target_go/goldmark/ast/ast.go:492 +0x5b
github.com/yuin/goldmark/ast.walkHelper(0x71ec00, 0xc000200ea0, 0xc000283d28, 0x3, 0x0, 0x0)
    /home/fuzz_target_go/goldmark/ast/ast.go:498 +0x175
github.com/yuin/goldmark/ast.walkHelper(0x71ed20, 0xc000200e10, 0xc000283d28, 0x3, 0x0, 0x0)
    /home/fuzz_target_go/goldmark/ast/ast.go:498 +0x175
github.com/yuin/goldmark/ast.walkHelper(0x71db20, 0xc000200d80, 0xc000283d28, 0xc0001ff900, 0x0, 0xc000200d00)
    /home/fuzz_target_go/goldmark/ast/ast.go:498 +0x175
github.com/yuin/goldmark/ast.Walk(...)
    /home/fuzz_target_go/goldmark/ast/ast.go:487
github.com/yuin/goldmark/renderer.(*renderer).Render(0xc00013ca50, 0x71a020, 0xc00029a720, 0x7f192c2bb000, 0x2f, 0x2f, 0x71db20, 0xc000200d80, 0xc00013ca01, 0xc00029a720)
    /home/fuzz_target_go/goldmark/renderer/renderer.go:161 +0x1ac
github.com/yuin/goldmark.(*markdown).Convert(0xc0001ff340, 0x7f192c2bb000, 0x2f, 0x2f, 0x71a020, 0xc00029a720, 0x0, 0x0, 0x0, 0x9, ...)
    /home/fuzz_target_go/goldmark/markdown.go:117 +0xfb
github.com/yuin/goldmark/fuzz.Fuzz(0x7f192c2bb000, 0x2f, 0x2f, 0x3)
    /home/fuzz_target_go/goldmark/fuzz/fuzz.go:34 +0x43a
go-fuzz-dep.Main(0xc000283f48, 0x1, 0x1)
    go-fuzz-dep/main.go:36 +0x1ad
main.main()
    github.com/yuin/goldmark/fuzz/go.fuzz.main/main.go:15 +0x52
exit status 2%

7. Did you confirm your output is different from CommonMark online demo or other official renderer correspond with an extension?: yes