Call dtls1_hm_fragment_free() from dtls1_drain_fragments()

Currently dtls1_drain_fragments() has a incomplete handrolled version of
dtls1_hm_fragment_free(), which has the potential to leak memory. Replace
the handrolled free with a call to dtls1_hm_fragment_free().

ok inoguchi@ tb@

2 files changed, 7 insertions, 8 deletions

diff --git a/src/lib/libssl/d1_both.c b/src/lib/libssl/d1_both.c
index 6541a395a7..3d2516ce41 100644
--- a/src/lib/libssl/d1_both.c
+++ b/src/lib/libssl/d1_both.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_both.c,v 1.59 2020/09/26 08:58:00 jsing Exp $ */
+/* $OpenBSD: d1_both.c,v 1.60 2020/09/26 14:43:17 jsing Exp $ */
 /*
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
@@ -166,7 +166,7 @@ static int dtls1_write_message_header(const struct hm_header_st *msg_hdr,
 static long dtls1_get_message_fragment(SSL *s, int st1, int stn, long max,
     int *ok);
 
-static void dtls1_hm_fragment_free(hm_fragment *frag);
+void dtls1_hm_fragment_free(hm_fragment *frag);
 
 static hm_fragment *
 dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
@@ -195,7 +195,7 @@ dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
         return NULL;
 }
 
-static void
+void
 dtls1_hm_fragment_free(hm_fragment *frag)
 {
         if (frag == NULL)
diff --git a/src/lib/libssl/d1_lib.c b/src/lib/libssl/d1_lib.c
index b2f05452c8..b7d23ef4ca 100644
--- a/src/lib/libssl/d1_lib.c
+++ b/src/lib/libssl/d1_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: d1_lib.c,v 1.49 2020/09/26 09:01:05 jsing Exp $ */
+/* $OpenBSD: d1_lib.c,v 1.50 2020/09/26 14:43:17 jsing Exp $ */
 /*
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
@@ -70,6 +70,8 @@
 #include "pqueue.h"
 #include "ssl_locl.h"
 
+void dtls1_hm_fragment_free(hm_fragment *frag);
+
 static int dtls1_listen(SSL *s, struct sockaddr *client);
 
 SSL3_ENC_METHOD DTLSv1_enc_data = {
@@ -130,15 +132,12 @@ static void
 dtls1_drain_fragments(pqueue queue)
 {
         pitem *item;
-        hm_fragment *frag;
 
         if (queue == NULL)
                 return;
 
         while ((item = pqueue_pop(queue)) != NULL) {
-                frag = (hm_fragment *)item->data;
-                free(frag->fragment);
-                free(frag);
+                dtls1_hm_fragment_free(item->data);
                 pitem_free(item);
         }
 }