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--- contrib/libs/libidn/lib/idna.c
+++ contrib/libs/libidn/lib/idna.c
@@ -423,6 +423,12 @@ step3:
* step 3, using a case-insensitive ASCII comparison.
*/
+ if (c_strncasecmp (tmpout, IDNA_ACE_PREFIX, STRLEN (IDNA_ACE_PREFIX)) != 0)
+ {
+ free (utf8in);
+ return IDNA_ROUNDTRIP_VERIFY_ERROR;
+ }
+
if (c_strcasecmp (utf8in, tmpout + STRLEN (IDNA_ACE_PREFIX)) != 0)
{
free (utf8in);
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