diff --git a/opengl/libagl/egl.cpp b/opengl/libagl/egl.cpp
index 81864bd..b6e0aae 100644
--- a/opengl/libagl/egl.cpp
+++ b/opengl/libagl/egl.cpp
@@ -2092,7 +2092,20 @@
 
     if (native_buffer->common.version != sizeof(android_native_buffer_t))
         return setError(EGL_BAD_PARAMETER, EGL_NO_IMAGE_KHR);
-    
+
+    switch (native_buffer->format) {
+        case HAL_PIXEL_FORMAT_RGBA_8888:
+        case HAL_PIXEL_FORMAT_RGBX_8888:
+        case HAL_PIXEL_FORMAT_RGB_888:
+        case HAL_PIXEL_FORMAT_RGB_565:
+        case HAL_PIXEL_FORMAT_BGRA_8888:
+        case HAL_PIXEL_FORMAT_RGBA_5551:
+        case HAL_PIXEL_FORMAT_RGBA_4444:
+            break;
+        default:
+            return setError(EGL_BAD_PARAMETER, EGL_NO_IMAGE_KHR);
+    }
+
     native_buffer->common.incRef(&native_buffer->common);
     return (EGLImageKHR)native_buffer;
 }
diff --git a/opengl/libagl/texture.cpp b/opengl/libagl/texture.cpp
index a1a776f..fa25fa9 100644
--- a/opengl/libagl/texture.cpp
+++ b/opengl/libagl/texture.cpp
@@ -1628,6 +1628,11 @@
         return;
     }
 
+    if (image == EGL_NO_IMAGE_KHR) {
+        ogles_error(c, GL_INVALID_VALUE);
+        return;
+    }
+
     android_native_buffer_t* native_buffer = (android_native_buffer_t*)image;
     if (native_buffer->common.magic != ANDROID_NATIVE_BUFFER_MAGIC) {
         ogles_error(c, GL_INVALID_VALUE);
@@ -1652,4 +1657,26 @@
 
 void glEGLImageTargetRenderbufferStorageOES(GLenum target, GLeglImageOES image)
 {
+    ogles_context_t* c = ogles_context_t::get();
+    if (target != GL_RENDERBUFFER_OES) {
+        ogles_error(c, GL_INVALID_ENUM);
+        return;
+    }
+
+    if (image == EGL_NO_IMAGE_KHR) {
+        ogles_error(c, GL_INVALID_VALUE);
+        return;
+    }
+
+    android_native_buffer_t* native_buffer = (android_native_buffer_t*)image;
+    if (native_buffer->common.magic != ANDROID_NATIVE_BUFFER_MAGIC) {
+        ogles_error(c, GL_INVALID_VALUE);
+        return;
+    }
+    if (native_buffer->common.version != sizeof(android_native_buffer_t)) {
+        ogles_error(c, GL_INVALID_VALUE);
+        return;
+    }
+
+    // well, we're not supporting this extension anyways
 }