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go/doc: fix incorrect indentifier decoding in comments

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This code was trying to decode each codepoint one by one, but didn't resliced the string, so it was instead reading the first codepoint over and over, if the string length was not a multiple of the codepoint length, this would cause us to walk past the end of the string.

This was a latent bug introduced in CL 397277 but was revealed to OSS-Fuzz in CL 384265.

Fixes #52353
This commit is contained in:
Jorropo 2022-04-14 13:00:47 +02:00
parent 0c6d8bb109
commit 424f6cfad1
2 changed files with 13 additions and 1 deletions
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2
src/go/doc/comment/parse.go
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@ -1063,7 +1063,7 @@ func ident(s string) (id string, ok bool) {
}
break
}
r, nr := utf8.DecodeRuneInString(s)
r, nr := utf8.DecodeRuneInString(s[n:])
if unicode.IsLetter(r) {
n += nr
continue

12
src/go/doc/comment/parse_test.go Normal file
View File

@ -0,0 +1,12 @@
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package comment
import "testing"
// See https://golang.org/issue/52353
func Test52353(t *testing.T) {
ident("𫕐ﯯ")
}