diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 5d2c0044e85..962cd7c5334 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -828,6 +828,22 @@ _mesa_dest_buffer_exists(struct gl_context *ctx, GLenum format)
    return renderbuffer_exists(ctx, ctx->DrawBuffer, format, GL_FALSE);
 }
 
+extern bool
+_mesa_has_rtt_samples(const struct gl_framebuffer *fb)
+{
+   /* If there are multiple attachments, all of them are guaranteed
+    * to have the same sample count. */
+   if (fb->_ColorReadBufferIndex) {
+      assert(fb->Attachment[fb->_ColorReadBufferIndex].Type != GL_NONE);
+      return fb->Attachment[fb->_ColorReadBufferIndex].NumSamples > 0;
+   } else if (fb->Attachment[BUFFER_DEPTH].Type != GL_NONE) {
+      return fb->Attachment[BUFFER_DEPTH].NumSamples > 0;
+   } else if (fb->Attachment[BUFFER_STENCIL].Type != GL_NONE) {
+      return fb->Attachment[BUFFER_STENCIL].NumSamples > 0;
+   }
+
+   return true;
+}
 
 /**
  * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES queries (using
diff --git a/src/mesa/main/framebuffer.h b/src/mesa/main/framebuffer.h
index 8891e4e4164..60c53e6af21 100644
--- a/src/mesa/main/framebuffer.h
+++ b/src/mesa/main/framebuffer.h
@@ -161,6 +161,9 @@ extern struct gl_renderbuffer *
 _mesa_get_read_renderbuffer_for_format(const struct gl_context *ctx,
                                        GLenum format);
 
+extern bool
+_mesa_has_rtt_samples(const struct gl_framebuffer *fb);
+
 extern void
 _mesa_print_framebuffer(const struct gl_framebuffer *fb);
 
diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index e7ab5f681d0..99788846058 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -1119,8 +1119,25 @@ read_pixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
          return;
       }
 
+      /**
+       * From the GL_EXT_multisampled_render_to_texture spec:
+       *
+       * Similarly, for ReadPixels:
+       * "An INVALID_OPERATION error is generated if the value of READ_-
+       *  FRAMEBUFFER_BINDING (see section 9) is non-zero, the read framebuffer
+       *  is framebuffer complete, and the value of SAMPLE_BUFFERS for the read
+       *  framebuffer is one."
+       *
+       * These errors do not apply to textures and renderbuffers that have
+       * associated multisample data specified by the mechanisms described in
+       * this extension, i.e., the above operations are allowed even when
+       * SAMPLE_BUFFERS is non-zero for renderbuffers created via Renderbuffer-
+       * StorageMultisampleEXT or textures attached via FramebufferTexture2D-
+       * MultisampleEXT.
+       */
       if (_mesa_is_user_fbo(ctx->ReadBuffer) &&
-          ctx->ReadBuffer->Visual.samples > 0) {
+          ctx->ReadBuffer->Visual.samples > 0 &&
+          !_mesa_has_rtt_samples(ctx->ReadBuffer)) {
          _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(multisample FBO)");
          return;
       }
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index a8fd97d9f63..412fce4d8c7 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -2692,8 +2692,27 @@ copytexsubimage_error_check(struct gl_context *ctx, GLuint dimensions,
          return GL_TRUE;
       }
 
+      /**
+       * From the GL_EXT_multisampled_render_to_texture spec:
+       *
+       * "An INVALID_OPERATION error is generated by CopyTexSubImage3D,
+       * CopyTexImage2D, or CopyTexSubImage2D if [...] the value of
+       * READ_FRAMEBUFFER_BINDING is non-zero, and:
+       *   - the read buffer selects an attachment that has no image attached,
+       *     or
+       *   - the value of SAMPLE_BUFFERS for the read framebuffer is one."
+       *
+       * [...]
+       * These errors do not apply to textures and renderbuffers that have
+       * associated multisample data specified by the mechanisms described in
+       * this extension, i.e., the above operations are allowed even when
+       * SAMPLE_BUFFERS is non-zero for renderbuffers created via Renderbuffer-
+       * StorageMultisampleEXT or textures attached via FramebufferTexture2D-
+       * MultisampleEXT.
+       */
       if (!ctx->st_opts->allow_multisampled_copyteximage &&
-          ctx->ReadBuffer->Visual.samples > 0) {
+          ctx->ReadBuffer->Visual.samples > 0 &&
+          !_mesa_has_rtt_samples(ctx->ReadBuffer)) {
          _mesa_error(ctx, GL_INVALID_OPERATION, "%s(multisample FBO)",
                      caller);
          return GL_TRUE;