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Add check for ID array length

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This commit is contained in:
Gunnsteinn Hall 2017-07-23 12:30:21 +00:00
parent 9ff2413609
commit 3639b5c279
1 changed files with 1 additions and 1 deletions
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2
pdf/core/crypt.go
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@ -292,7 +292,7 @@ func PdfCryptMakeNew(parser *PdfParser, ed, trailer *PdfObjectDictionary) (PdfCr
// Strictly, if file is encrypted, the ID should always be specified
// but clearly not everyone is following the specification.
id0 := PdfObjectString("")
if idArray, ok := trailer.Get("ID").(*PdfObjectArray); ok {
if idArray, ok := trailer.Get("ID").(*PdfObjectArray); ok && len(*idArray) >= 1 {
id0obj, ok := (*idArray)[0].(*PdfObjectString)
if !ok {
return crypter, errors.New("Invalid trailer ID")