fix: crash in mbox_to_udomain

Fixes #778

diff --git a/mutt_idna.c b/mutt_idna.c
index 2923444f7545758f1f400b8fee518ecc10fad06d..7a956fdca5f91daf6c1842b0a975981212644a9b 100644 (file)
--- a/mutt_idna.c
+++ b/mutt_idna.c
@@ -57,6 +57,8 @@ static int mbox_to_udomain(const char *mbx, char **user, char **domain)
   char *p = NULL;
 
   mutt_str_replace(&buff, mbx);
+  if (!buff)
+    return -1;
 
   p = strchr(buff, '@');
   if (!p || !p[1])