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message: double-check part-type in Multipart 

Avoid exception for some messages (unsigned messages with signed
attachment).
This commit is contained in:
Dirk-Jan C. Binnema 2023-07-05 20:21:42 +03:00
parent 9004363aa5
commit c5f3894374
1 changed files with 6 additions and 3 deletions
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9
lib/message/mu-mime-object.hh
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@ -1291,12 +1291,15 @@ public:
void for_each(const ForEachFunc& func) const noexcept;
private:
// Note: the part may not be available if the message was marked as
// _signed_ or _encrypted_ because it contained a forwarded signed or
// encrypted message.
Option<MimePart> part(int index) const {
if (MimeObject mobj{g_mime_multipart_get_part(self(),index)}; !mobj)
if (auto&& p{g_mime_multipart_get_part(self() ,index)};
!GMIME_IS_PART(p))
return Nothing;
else
return mobj;
return Some(MimeObject{p});
}
GMimeMultipart* self() const {