[client] overlay: fix unsafe ImGui string handling

client/src/overlay/config.c

@@ -28,10 +28,11 @@
 
 #include "common/debug.h"
 #include "common/appstrings.h"
+#include "common/stringutils.h"
 
 typedef struct ConfigCallback
 {
-  const char * title;
+  char * title;
   void * udata;
   void (*callback)(void * udata, int * id);
 }
@@ -61,7 +62,10 @@ static void config_freeList(struct ll * list)
 {
   ConfigCallback * cb;
   while(ll_shift(list, (void **)&cb))
+  {
+    free(cb->title);
     free(cb);
+  }
   ll_free(list);
 }
 
@@ -78,9 +82,9 @@ static void config_renderLGTab(void)
   if (igCollapsingHeader_BoolPtr("Donations", NULL,
         ImGuiTreeNodeFlags_DefaultOpen))
   {
-    igTextWrapped(LG_DONATION_STR);
+    igTextWrapped("%s", LG_DONATION_STR);
 
-    igBeginTable("split", 2, 0, (ImVec2){}, 0.0f);
+    igBeginTable("donations_split", 2, 0, (ImVec2){}, 0.0f);
     igTableSetupColumn("", ImGuiTableColumnFlags_WidthFixed, fontSize, 0);
     igTableNextColumn();
     igBulletText("");
@@ -93,12 +97,12 @@ static void config_renderLGTab(void)
   if (igCollapsingHeader_BoolPtr("Help & Support", NULL,
         ImGuiTreeNodeFlags_DefaultOpen))
   {
-    igBeginTable("split", 2, 0, (ImVec2){}, 0.0f);
+    igBeginTable("help_support_split", 2, 0, (ImVec2){}, 0.0f);
     igTableSetupColumn("", ImGuiTableColumnFlags_WidthFixed, fontSize * 9.0f, 0);
     for(const StringPair * help = LG_HELP_LINKS; help->name; ++help)
     {
       igTableNextColumn();
-      igBulletText(help->name);
+      igBulletText("%s", help->name);
       igTableNextColumn();
       overlayTextMaybeURL(help->value, true);
     }
@@ -113,7 +117,7 @@ static void config_renderLGTab(void)
       if (igTreeNode_Str(member->name))
       {
         igSpacing();
-        igTextWrapped(member->blurb);
+        igTextWrapped("%s", member->blurb);
         if (member->donate[0].name)
         {
           igSeparator();
@@ -122,13 +126,13 @@ static void config_renderLGTab(void)
               "do so directly via the following platform%s:",
               member->donate[1].name ? "s" : "");
 
-          igBeginTable("split", 2, 0, (ImVec2){}, 0.0f);
+          igBeginTable("member_donations_split", 2, 0, (ImVec2){}, 0.0f);
           igTableSetupColumn("", ImGuiTableColumnFlags_WidthFixed,
               fontSize * 10.0f, 0);
           for(const StringPair * donate = member->donate; donate->name; ++donate)
           {
             igTableNextColumn();
-            igBulletText(donate->name);
+            igBulletText("%s", donate->name);
             igTableNextColumn();
             overlayTextMaybeURL(donate->value, false);
           }
@@ -143,11 +147,11 @@ static void config_renderLGTab(void)
 
 static void config_renderLicenseTab(void)
 {
-  igText(LG_COPYRIGHT_STR);
+  igTextUnformatted(LG_COPYRIGHT_STR, NULL);
   overlayTextURL(LG_WEBSITE_URL, NULL);
-  igText(LG_VERSION_STR);
+  igTextUnformatted(LG_VERSION_STR, NULL);
   igSeparator();
-  igTextWrapped(LG_LICENSE_STR);
+  igTextWrapped("%s", LG_LICENSE_STR);
 }
 
 static int config_render(void * udata, bool interactive, struct Rect * windowRects,
@@ -246,6 +250,12 @@ struct LG_OverlayOps LGOverlayConfig =
 static void config_addToList(struct ll * list, const char * title,
     void(*callback)(void * udata, int * id), void * udata)
 {
+  if (!title || !*title)
+  {
+    DEBUG_ERROR("configuration title must not be empty");
+    return;
+  }
+
   ConfigCallback * cb = calloc(1, sizeof(*cb));
   if (!cb)
   {
@@ -253,7 +263,14 @@ static void config_addToList(struct ll * list, const char * title,
     return;
   }
 
-  cb->title    = title;
+  cb->title = lg_strdup(title);
+  if (!cb->title)
+  {
+    DEBUG_ERROR("failed to allocate ram");
+    free(cb);
+    return;
+  }
+
   cb->udata    = udata;
   cb->callback = callback;
   ll_push(list, cb);

client/src/overlay/graphs.c

@@ -24,6 +24,7 @@
 #include "../main.h"
 
 #include "common/debug.h"
+#include "common/stringutils.h"
 #include "overlay_utils.h"
 
 struct GraphState
@@ -36,7 +37,7 @@ static struct GraphState gs = {0};
 
 struct OverlayGraph
 {
-  const char *  name;
+  char *        name;
   RingBuffer    buffer;
   bool          enabled;
   float         min;
@@ -50,7 +51,7 @@ static void configCallback(void * udata, int * id)
   igCheckbox("Show timing graphs", &gs.show);
   igSeparator();
 
-  igBeginTable("split", 2, 0, (ImVec2){}, 0);
+  igBeginTable("graphs_split", 2, 0, (ImVec2){}, 0);
 
   GraphHandle graph;
   ll_lock(gs.graphs);
@@ -89,7 +90,10 @@ static void graphs_free(void * udata)
 {
   struct OverlayGraph * graph;
   while(ll_shift(gs.graphs, (void **)&graph))
+  {
+    free(graph->name);
     free(graph);
+  }
   ll_free(gs.graphs);
   gs.graphs = NULL;
 }
@@ -231,6 +235,12 @@ struct LG_OverlayOps LGOverlayGraphs =
 GraphHandle overlayGraph_register(const char * name, RingBuffer buffer,
     float min, float max, GraphFormatFn formatFn)
 {
+  if (!name || !*name)
+  {
+    DEBUG_ERROR("graph name must not be empty");
+    return NULL;
+  }
+
   struct OverlayGraph * graph = malloc(sizeof(*graph));
   if (!graph)
   {
@@ -238,7 +248,14 @@ GraphHandle overlayGraph_register(const char * name, RingBuffer buffer,
     return NULL;
   }
 
-  graph->name     = name;
+  graph->name = lg_strdup(name);
+  if (!graph->name)
+  {
+    DEBUG_ERROR("out of memory");
+    free(graph);
+    return NULL;
+  }
+
   graph->buffer   = buffer;
   graph->enabled  = true;
   graph->min      = min;
@@ -250,10 +267,11 @@ GraphHandle overlayGraph_register(const char * name, RingBuffer buffer,
 
 void overlayGraph_unregister(GraphHandle handle)
 {
-  if (!gs.graphs)
+  if (!gs.graphs || !handle)
     return;
 
   ll_removeData(gs.graphs, handle);
+  free(handle->name);
   free(handle);
 
   if (gs.show)

client/src/overlay/help.c

@@ -75,7 +75,7 @@ static int help_render(void * udata, bool interactive, struct Rect * windowRects
       else
         igText("%s+%c", escapeName, handle->charcode);
       igTableNextColumn();
-      igText(handle->description);
+      igTextUnformatted(handle->description, NULL);
     }
 
     igEndTable();

client/src/overlay/msg.c

@@ -205,35 +205,56 @@ MsgBoxHandle overlayMsg_show(
     const char * caption, MsgBoxConfirmCallback confirm, void * opaque,
     const char * fmt, va_list args)
 {
-  struct Msg * msg = malloc(sizeof(*msg));
+  struct Msg * msg = calloc(1, sizeof(*msg));
   if (!msg)
   {
     DEBUG_ERROR("out of memory");
     return NULL;
   }
 
-  msg->caption = strdup(caption);
+  msg->caption = lg_strdup(caption && *caption ? caption : "Message");
+  if (!msg->caption)
+  {
+    DEBUG_ERROR("out of memory");
+    free(msg);
+    return NULL;
+  }
+
   msg->lines   = stringlist_new(false);
+  if (!msg->lines)
+  {
+    free(msg->caption);
+    free(msg);
+    return NULL;
+  }
+
   msg->confirm = confirm;
   msg->opaque  = opaque;
-  valloc_sprintf(&msg->message, fmt, args);
+  if (valloc_sprintf(&msg->message, fmt ? fmt : "", args) < 0)
+  {
+    DEBUG_ERROR("failed to format message");
+    freeMsg(msg);
+    return NULL;
+  }
 
   char * token = msg->message;
-  char * rest  = msg->message;
+  for(char * rest = msg->message; ; ++rest)
-  do
   {
     if (*rest == '\n')
     {
       *rest = '\0';
       stringlist_push(msg->lines, token);
       token = rest + 1;
+      continue;
     }
-    ++rest;
-  }
-  while(*rest != '\0');
 
+    if (*rest == '\0')
+    {
       if (*token)
         stringlist_push(msg->lines, token);
+      break;
+    }
+  }
 
   ll_push(l_msg.messages, msg);
   app_invalidateOverlay(false);

client/src/overlay_utils.c

@@ -69,7 +69,7 @@ static void overlayAddUnderline(ImU32 color)
 
 void overlayTextURL(const char * url, const char * text)
 {
-  igText(text ? text : url);
+  igTextUnformatted(text ? text : url, NULL);
 
   if (igIsItemHovered(ImGuiHoveredFlags_None))
   {
@@ -87,9 +87,9 @@ void overlayTextMaybeURL(const char * text, bool wrapped)
   if (strncmp(text, "https://", 8) == 0)
     overlayTextURL(text, NULL);
   else if (wrapped)
-    igTextWrapped(text);
+    igTextWrapped("%s", text);
   else
-    igText(text);
+    igTextUnformatted(text, NULL);
 }
 
 bool overlayLoadSVG(const char * data, unsigned int size, OverlayImage * image,