Commit b4322e1d authored by Dr. Stephen Henson's avatar Dr. Stephen Henson
Browse files

Fix CVE-2014-0221

Unnecessary recursion when receiving a DTLS hello request can be used to
crash a DTLS client. Fixed by handling DTLS hello request without recursion.

Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.
(cherry picked from commit d3152655)
parent a5362db4
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+2 −2
Original line number Diff line number Diff line
@@ -789,6 +789,7 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
	int i,al;
	struct hm_header_st msg_hdr;

	redo:
	/* see if we have the required fragment already */
	if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
		{
@@ -847,8 +848,7 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
					s->msg_callback_arg);
			
			s->init_num = 0;
			return dtls1_get_message_fragment(s, st1, stn,
				max, ok);
			goto redo;
			}
		else /* Incorrectly formated Hello request */
			{