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Fix panic by checking slice bounds in handleEntities (telegram). Fixes #857 (#858)

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Besides the bound checking, this now also use utf16 as suggested by
https://github.com/go-telegram-bot-api/telegram-bot-api/issues/231
This commit is contained in:
Wim 2019-07-08 22:19:45 +02:00 committed by GitHub
parent e60949ff3f
commit 1fb91c6316
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1 changed files with 9 additions and 3 deletions
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12
bridge/telegram/handlers.go
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@ -5,10 +5,11 @@ import (
"regexp" "regexp"
"strconv" "strconv"
"strings" "strings"
"unicode/utf16"
"github.com/42wim/matterbridge/bridge/config" "github.com/42wim/matterbridge/bridge/config"
"github.com/42wim/matterbridge/bridge/helper" "github.com/42wim/matterbridge/bridge/helper"
"github.com/go-telegram-bot-api/telegram-bot-api" tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api"
) )
func (b *Btelegram) handleUpdate(rmsg *config.Message, message, posted, edited *tgbotapi.Message) *tgbotapi.Message { func (b *Btelegram) handleUpdate(rmsg *config.Message, message, posted, edited *tgbotapi.Message) *tgbotapi.Message {
@ -375,8 +376,13 @@ func (b *Btelegram) handleEntities(rmsg *config.Message, message *tgbotapi.Messa
b.Log.Errorf("entity text_link url parse failed: %s", err) b.Log.Errorf("entity text_link url parse failed: %s", err)
continue continue
} }
link := rmsg.Text[e.Offset : e.Offset+e.Length] utfEncodedString := utf16.Encode([]rune(rmsg.Text))
rmsg.Text = strings.Replace(rmsg.Text, link, url.String(), 1) if e.Offset+e.Length > len(utfEncodedString) {
b.Log.Errorf("entity length is too long %d > %d", e.Offset+e.Length, len(utfEncodedString))
continue
}
link := utf16.Decode(utfEncodedString[e.Offset : e.Offset+e.Length])
rmsg.Text = strings.Replace(rmsg.Text, string(link), url.String(), 1)
} }
} }
} }