4 files changed, 41 insertions, 10 deletions
diff --git a/indra/llrender/llgltexture.cpp b/indra/llrender/llgltexture.cpp
index 9a2b2ef524..bb4205b319 100644
--- a/indra/llrender/llgltexture.cpp
+++ b/indra/llrender/llgltexture.cpp
@@ -170,6 +170,13 @@ bool LLGLTexture::createGLTexture(S32 discard_level, const LLImageRaw* imageraw,
 
 void LLGLTexture::getGLObjectLabel(std::string& label, bool& error) const
 {
+    // GL_VERSION_4_3
+    if (gGLManager.mGLVersion < 4.29f)
+    {
+        error = true;
+        label.clear();
+        return;
+    }
     if (!mGLTexturep)
     {
         error = true;
@@ -194,6 +201,8 @@ void LLGLTexture::getGLObjectLabel(std::string& label, bool& error) const
 
 std::string LLGLTexture::setGLObjectLabel(const std::string& prefix, bool append_texname) const
 {
+    if (gGLManager.mGLVersion < 4.29f) { return ""; } // GL_VERSION_4_3
+
     llassert(mGLTexturep);
     if (mGLTexturep)
     {
diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 5d3f3d58c6..4d0cffa2a9 100644
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -7935,7 +7935,18 @@
     <key>RenderDebugTextureLabel</key>
     <map>
       <key>Comment</key>
-      <string>Enable texture labels via glObjectLabel. Requires restart for some features.</string>
+      <string>Enable texture labels via glObjectLabel.</string>
+      <key>Persist</key>
+      <integer>0</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>0</integer>
+    </map>
+    <key>RenderDebugTextureLabelLocalFiles</key>
+    <map>
+      <key>Comment</key>
+      <string>Enumerate textures with local file names. Doesn't do anything until RenderDebugTextureLabel is set to true. Requires restart.</string>
       <key>Persist</key>
       <integer>1</integer>
       <key>Type</key>
diff --git a/indra/newview/llviewertexturelist.cpp b/indra/newview/llviewertexturelist.cpp
index 99df814f32..4c13105d5d 100644
--- a/indra/newview/llviewertexturelist.cpp
+++ b/indra/newview/llviewertexturelist.cpp
@@ -447,7 +447,7 @@ LLViewerFetchedTexture* LLViewerTextureList::getImageFromFile(const std::string&
     std::string url = "file://" + full_path;
 
     LLViewerFetchedTexture* tex = getImageFromUrl(url, f_type, usemipmaps, boost_priority, texture_type, internal_format, primary_format, force_id);
-    static LLCachedControl<bool> debug_texture_label(gSavedSettings, "RenderDebugTextureLabel", false);
+    static LLCachedControl<bool> debug_texture_label(gSavedSettings, "RenderDebugTextureLabelLocalFiles", false);
     if (debug_texture_label())
     {
         gTextureList.mNameTextureList.push_back(LLViewerTextureList::NameElement(tex, filename));
@@ -1160,12 +1160,24 @@ void LLViewerTextureList::updateImagesNameTextures()
     auto it = mNameTextureList.begin();
     while (it != mNameTextureList.end()) // For ALL textures needing names
     {
-        if (it->mTex->hasGLTexture())
+        LLViewerFetchedTexture* tex = it->mTex;
+        // Check that the texture is in the list first (otherwise it may be a dead pointer)
+        // A raw pointer ensures textures are cleaned up when this code isn't running.
+        const bool alive = mImageList.find(tex) != mImageList.end();
+
+        if (alive)
         {
-            if(it->mTex->getTexName())
+            if (tex->hasGLTexture())
             {
-                it->mTex->setGLObjectLabel(it->mPrefix, true);
-                it = mNameTextureList.erase(it); // Assume no rename needed
+                if(tex->getTexName())
+                {
+                    tex->setGLObjectLabel(it->mPrefix, true);
+                    it = mNameTextureList.erase(it); // Assume no rename needed
+                }
+                else
+                {
+                    ++it; // Not ready
+                }
             }
             else
             {
@@ -1174,7 +1186,7 @@ void LLViewerTextureList::updateImagesNameTextures()
         }
         else
         {
-            ++it; // Not ready
+            it = mNameTextureList.erase(it); // Remove dead pointer
         }
     }
 }
@@ -1190,9 +1202,8 @@ void LLViewerTextureList::labelAll()
 
     std::string label;
     bool error;
-    for (image_list_t::iterator it = mImageList.begin(); it != mImageList.end(); ++it)
+    for (LLViewerFetchedTexture* image : mImageList)
     {
-        LLViewerFetchedTexture* image = *it;
         image->getGLObjectLabel(label, error);
         if (!error && label.empty())
         {
diff --git a/indra/newview/llviewertexturelist.h b/indra/newview/llviewertexturelist.h
index 6424e5c3f0..08dd2d0f7f 100644
--- a/indra/newview/llviewertexturelist.h
+++ b/indra/newview/llviewertexturelist.h
@@ -220,7 +220,7 @@ public:
     struct NameElement
     {
         NameElement(LLViewerFetchedTexture* tex, const std::string& prefix) : mTex(tex), mPrefix(prefix) {}
-        LLPointer<LLViewerFetchedTexture> mTex;
+        LLViewerFetchedTexture* mTex;
         std::string mPrefix;
     };
     std::vector<NameElement> mNameTextureList;