MT#59962 AmSdp::parse(): always check return value

When using that, the return value must always
be checked, because the parsing itself can indeed fail.

Fixes such things as:

** CID 583412:       Error handling issues  (CHECKED_RETURN)
/core/AmB2BSession.cpp: 340           in AmB2BSession::acceptPendingInvite(AmSipRequest *, const AmMimeBody *)()
_____________________________________________________________________________________________
*** CID 583412:         Error handling issues  (CHECKED_RETURN)
/core/AmB2BSession.cpp: 340             in AmB2BSession::acceptPendingInvite(AmSipRequest *, const AmMimeBody *)()
334         return;
335       }
336
337       /* port must reflect actual port in SDP offer coming in */
338       if (sdp) {
339         AmSdp fake_sdp;
>>>     CID 583412:         Error handling issues  (CHECKED_RETURN)
>>>     Calling "parse" without checking return value (as is done elsewhere 12 out of 15 times).
340         fake_sdp.parse((const char *)sdp->getPayload());
341         desired_port = getMediaPort(fake_sdp);
342       }
343
344       if (desired_port) {
345         ILOG_DLG(L_DBG, "Desired port for fake 200OK is '%d'\n", desired_port);

Change-Id: I7bd177a624ebe2df2629863eb31f97f99bd921bb

apps/sbc/SBCCallLeg.cpp

@@ -1869,7 +1869,13 @@ void SBCCallLeg::createHoldRequest(AmSdp &sdp)
   // version number in every SDP passing through?)
 
   AmMimeBody *s = dlg->established_body.hasContentType(SIP_APPLICATION_SDP);
-  if (s) sdp.parse((const char*)s->getPayload());
+  if (s) {
+    if (sdp.parse((const char*)s->getPayload()))
+    {
+      ILOG_DLG(L_WARN, "Failed to parse SDP.\n");
+      return;
+    }
+  }
 
   if (sdp.media.empty()) {
     // established SDP is not valid! generate complete fake

core/AmB2BSession.cpp

@@ -291,7 +291,11 @@ void AmB2BSession::addFakeSDPbasedOnPort(const AmMimeBody *src_sdp, AmMimeBody &
   /* create fake AmSdp from AmMimeBody */
   AmSdp fake_sdp;
   AmMimeBody fake_mimebody;
-  fake_sdp.parse((const char *)src_sdp->getPayload());
+  if (fake_sdp.parse((const char *)src_sdp->getPayload()))
+  {
+    ILOG_DLG(L_WARN, "Failed to parse SDP.\n");
+    return;
+  }
 
   for (auto it = fake_sdp.media.begin(); it != fake_sdp.media.end(); ++it)
   {
@@ -337,8 +341,13 @@ void AmB2BSession::acceptPendingInvite(AmSipRequest *invite, const AmMimeBody *s
   /* port must reflect actual port in SDP offer coming in */
   if (sdp) {
     AmSdp fake_sdp;
-    fake_sdp.parse((const char *)sdp->getPayload());
-    desired_port = getMediaPort(fake_sdp);
+    if (fake_sdp.parse((const char *)sdp->getPayload()))
+    {
+      ILOG_DLG(L_WARN, "Failed to parse SDP.\n");
+    }
+    else {
+      desired_port = getMediaPort(fake_sdp);
+    }
   }
 
   if (desired_port) {