fix: crash with short attachment name

diff --git a/ncrypt/crypt.c b/ncrypt/crypt.c
index 2ea8fa09976e255d38cb36d39e803bea75bfa172..abcf83feb61883d41e48bec8261c01dd118e6c35 100644 (file)
--- a/ncrypt/crypt.c
+++ b/ncrypt/crypt.c
@@ -637,7 +637,7 @@ int mutt_is_application_smime(struct Body *m)
 
   /* no .p7c, .p10 support yet. */
 
-  size_t len = mutt_str_strlen(t) - 4;
+  int len = mutt_str_strlen(t) - 4;
   if (len > 0 && *(t + len) == '.')
   {
     len++;