stream: count realloc in memcap

TCP memory cap was not taking into account the memory that can
be used by realloc of Packet headers in TCP segments.

src/stream-tcp-list.c

@@ -595,9 +595,9 @@ static void StreamTcpSegmentAddPacketData(
          * need to check that this is sufficient and allocate more memory if
          * not.
          */
-        if (GET_PKT_LEN(rp) - p->payload_len > seg->pcap_hdr_storage->alloclen) {
-            uint8_t *tmp_pkt_hdr =
-                    SCRealloc(seg->pcap_hdr_storage->pkt_hdr, GET_PKT_LEN(rp) - p->payload_len);
+        if (seg->pcap_hdr_storage->pktlen > seg->pcap_hdr_storage->alloclen) {
+            uint8_t *tmp_pkt_hdr = StreamTcpReassembleRealloc(seg->pcap_hdr_storage->pkt_hdr,
+                    seg->pcap_hdr_storage->alloclen, seg->pcap_hdr_storage->pktlen);
             if (tmp_pkt_hdr == NULL) {
                 SCLogDebug("Failed to realloc");
                 seg->pcap_hdr_storage->ts.tv_sec = 0;

src/stream-tcp-reassemble.c

@@ -224,7 +224,7 @@ static void *ReassembleCalloc(size_t n, size_t size)
 /*
     void *(*Realloc)(void *ptr, size_t orig_size, size_t size);
 */
-static void *ReassembleRealloc(void *optr, size_t orig_size, size_t size)
+void *StreamTcpReassembleRealloc(void *optr, size_t orig_size, size_t size)
 {
     if (size > orig_size) {
         if (StreamTcpReassembleCheckMemcap(size - orig_size) == 0)
@@ -484,7 +484,7 @@ static int StreamTcpReassemblyConfig(bool quiet)
     stream_config.sbcnf.buf_size = 2048;
     stream_config.sbcnf.Malloc = ReassembleMalloc;
     stream_config.sbcnf.Calloc = ReassembleCalloc;
-    stream_config.sbcnf.Realloc = ReassembleRealloc;
+    stream_config.sbcnf.Realloc = StreamTcpReassembleRealloc;
     stream_config.sbcnf.Free = ReassembleFree;
 
     return 0;

src/stream-tcp-reassemble.h

@@ -85,6 +85,7 @@ void StreamTcpReassembleInitMemuse(void);
 int StreamTcpReassembleHandleSegment(ThreadVars *, TcpReassemblyThreadCtx *, TcpSession *, TcpStream *, Packet *, PacketQueueNoLock *);
 int StreamTcpReassembleInit(bool);
 void StreamTcpReassembleFree(bool);
+void *StreamTcpReassembleRealloc(void *optr, size_t orig_size, size_t size);
 void StreamTcpReassembleRegisterTests(void);
 TcpReassemblyThreadCtx *StreamTcpReassembleInitThreadCtx(ThreadVars *tv);
 void StreamTcpReassembleFreeThreadCtx(TcpReassemblyThreadCtx *);