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Check and better errors

This commit is contained in:
Miek Gieben 2014-04-08 00:09:26 +01:00
parent 8f8b675103
commit fcbb2e7a9a
1 changed files with 5 additions and 2 deletions
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7
msg.go
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@ -508,7 +508,7 @@ func packTxtString(s string, msg []byte, offset int, tmp []byte) (int, error) {
}
l := offset - lenByteOffset - 1
if l > 255 {
return offset, &Error{err: "TXT string exceeded 255 bytes"}
return offset, &Error{err: "string exceeded 255 bytes in txt"}
}
msg[lenByteOffset] = byte(l)
return offset, nil
@ -528,9 +528,12 @@ func unpackTxt(msg []byte, offset, rdend int) ([]string, int, error) {
}
func unpackTxtString(msg []byte, offset int) (string, int, error) {
if offset + 1 > len(msg) {
return "", offset, &Error{err: "overflow unpacking txt"}
}
l := int(msg[offset])
if offset+l+1 > len(msg) {
return "", offset, &Error{err: "TXT string truncated"}
return "", offset, &Error{err: "overflow unpacking txt"}
}
s := make([]byte, 0, l)
for _, b := range msg[offset+1 : offset+1+l] {