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- crash after filter update if its data is too small

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This commit is contained in:
Simon Zolin 2019-09-27 13:22:08 +03:00
parent 309feeae9a
commit 319cc848bd
1 changed files with 8 additions and 2 deletions
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10
home/filter.go
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@ -370,11 +370,17 @@ func (filter *filter) update() (bool, error) {
return false, nil
}
if !isPrintableText(body[:4096]) {
var firstChunk []byte
if len(body) <= 4096 {
firstChunk = body
} else {
firstChunk = body[:4096]
}
if !isPrintableText(firstChunk) {
return false, fmt.Errorf("Data contains non-printable characters")
}
s := strings.ToLower(string(body[:4096]))
s := strings.ToLower(string(firstChunk))
if strings.Index(s, "<html") >= 0 ||
strings.Index(s, "<!doctype") >= 0 {
return false, fmt.Errorf("Data is HTML, not plain text")