Add some missing null checks

toxav/bwcontroller.c

@@ -67,6 +67,11 @@ BWController *bwc_new(Messenger *m, Tox *tox, uint32_t friendnumber, m_cb *mcb,
                       Mono_Time *bwc_mono_time)
 {
     BWController *retu = (BWController *)calloc(sizeof(struct BWController_s), 1);
+
+    if (retu == nullptr) {
+        return nullptr;
+    }
+
     LOGGER_DEBUG(m->log, "Creating bandwidth controller");
     retu->mcb = mcb;
     retu->mcb_user_data = mcb_user_data;

toxav/ring_buffer.c

@@ -32,6 +32,10 @@ bool rb_empty(const RingBuffer *b)
  */
 void *rb_write(RingBuffer *b, void *p)
 {
+    if (b == nullptr) {
+        return p;
+    }
+
     void *rc = nullptr;
 
     if ((b->end + 1) % b->size == b->start) { /* full */

toxav/rtp.c

@@ -578,7 +578,13 @@ NEW_MULTIPARTED:
         /* Store message.
          */
         session->mp = new_message(&header, header.data_length_lower, data + RTP_HEADER_SIZE, length - RTP_HEADER_SIZE);
+
+        if (session->mp != nullptr) {
             memmove(session->mp->data + header.offset_lower, session->mp->data, session->mp->len);
+        } else {
+            LOGGER_WARNING(m->log, "new_message() returned a null pointer");
+            return -1;
+        }
     }
 
     return 0;

toxav/toxav.c

@@ -1302,7 +1302,7 @@ static bool call_prepare_transmission(ToxAVCall *call)
 
     ToxAV *av = call->av;
 
-    if (!av->acb && !av->vcb) {
+    if (av->acb == nullptr && av->vcb == nullptr) {
         /* It makes no sense to have CSession without callbacks */
         return false;
     }
@@ -1323,10 +1323,15 @@ static bool call_prepare_transmission(ToxAVCall *call)
     /* Prepare bwc */
     call->bwc = bwc_new(av->m, av->tox, call->friend_number, callback_bwc, call, av->toxav_mono_time);
 
+    if (call->bwc == nullptr) {
+        LOGGER_ERROR(av->m->log, "Failed to create new bwc");
+        goto FAILURE;
+    }
+
     {   /* Prepare audio */
         call->audio = ac_new(av->toxav_mono_time, av->m->log, av, call->friend_number, av->acb, av->acb_user_data);
 
-        if (!call->audio) {
+        if (call->audio == nullptr) {
             LOGGER_ERROR(av->m->log, "Failed to create audio codec session");
             goto FAILURE;
         }
@@ -1334,15 +1339,16 @@ static bool call_prepare_transmission(ToxAVCall *call)
         call->audio_rtp = rtp_new(RTP_TYPE_AUDIO, av->m, av->tox, call->friend_number, call->bwc,
                                   call->audio, ac_queue_message);
 
-        if (!call->audio_rtp) {
+        if (call->audio_rtp == nullptr) {
             LOGGER_ERROR(av->m->log, "Failed to create audio rtp session");
             goto FAILURE;
         }
     }
+
     {   /* Prepare video */
         call->video = vc_new(av->toxav_mono_time, av->m->log, av, call->friend_number, av->vcb, av->vcb_user_data);
 
-        if (!call->video) {
+        if (call->video == nullptr) {
             LOGGER_ERROR(av->m->log, "Failed to create video codec session");
             goto FAILURE;
         }
@@ -1350,7 +1356,7 @@ static bool call_prepare_transmission(ToxAVCall *call)
         call->video_rtp = rtp_new(RTP_TYPE_VIDEO, av->m, av->tox, call->friend_number, call->bwc,
                                   call->video, vc_queue_message);
 
-        if (!call->video_rtp) {
+        if (call->video_rtp == nullptr) {
             LOGGER_ERROR(av->m->log, "Failed to create video rtp session");
             goto FAILURE;
         }

toxcore/group.c

@@ -1542,6 +1542,10 @@ static bool send_invite_response(Group_Chats *g_c, int groupnumber, uint32_t fri
 {
     Group_c *g = get_group_c(g_c, groupnumber);
 
+    if (g == nullptr) {
+        return false;
+    }
+
     const bool member = (g->status == GROUPCHAT_STATUS_CONNECTED);
 
     VLA(uint8_t, response, member ? INVITE_MEMBER_PACKET_SIZE : INVITE_ACCEPT_PACKET_SIZE);