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Fix invalid pad length [v3] (#413)

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* Update filter_aesv3.go
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Gunnsteinn Hall 2019-04-15 15:59:23 +00:00 committed by GitHub
parent f8ac397bdf
commit 01f3ac17b7
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1 changed files with 2 additions and 3 deletions
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pdf/core/security/crypt/filter_aesv3.go
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@ -140,10 +140,9 @@ func (filterAES) DecryptBytes(buf []byte, okey []byte) ([]byte, error) {
} }
// The padded length is indicated by the last values. Remove those. // The padded length is indicated by the last values. Remove those.
padLen := int(buf[len(buf)-1]) padLen := int(buf[len(buf)-1])
if padLen >= len(buf) { if padLen > len(buf) {
common.Log.Debug("Illegal pad length") common.Log.Debug("Illegal pad length (%d > %d)", padLen, len(buf))
return buf, fmt.Errorf("invalid pad length") return buf, fmt.Errorf("invalid pad length")
} }
buf = buf[:len(buf)-padLen] buf = buf[:len(buf)-padLen]