diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 26fc15d..ce5eeae 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -222,15 +222,21 @@
  * default / window-system FB object.
  * If \p attachment is GL_DEPTH_STENCIL_ATTACHMENT, return a pointer to
  * the depth buffer attachment point.
+ * Returns if the attachment is a GL_COLOR_ATTACHMENTm_EXT on
+ * is_color_attachment, because several callers would return different errors
+ * if they don't find the attachment.
  */
 static struct gl_renderbuffer_attachment *
 get_attachment(struct gl_context *ctx, struct gl_framebuffer *fb,
-               GLenum attachment)
+               GLenum attachment, bool *is_color_attachment)
 {
    GLuint i;
 
    assert(_mesa_is_user_fbo(fb));
 
+   if (is_color_attachment)
+      *is_color_attachment = false;
+
    switch (attachment) {
    case GL_COLOR_ATTACHMENT0_EXT:
    case GL_COLOR_ATTACHMENT1_EXT:
@@ -248,6 +254,8 @@
    case GL_COLOR_ATTACHMENT13_EXT:
    case GL_COLOR_ATTACHMENT14_EXT:
    case GL_COLOR_ATTACHMENT15_EXT:
+      if (is_color_attachment)
+         *is_color_attachment = true;
       /* Only OpenGL ES 1.x forbids color attachments other than
        * GL_COLOR_ATTACHMENT0.  For all other APIs the limit set by the
        * hardware is used.
@@ -543,13 +551,13 @@
 
    mtx_lock(&fb->Mutex);
 
-   att = get_attachment(ctx, fb, attachment);
+   att = get_attachment(ctx, fb, attachment, NULL);
    assert(att);
    if (rb) {
       set_renderbuffer_attachment(ctx, att, rb);
       if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
          /* do stencil attachment here (depth already done above) */
-         att = get_attachment(ctx, fb, GL_STENCIL_ATTACHMENT_EXT);
+         att = get_attachment(ctx, fb, GL_STENCIL_ATTACHMENT_EXT, NULL);
          assert(att);
          set_renderbuffer_attachment(ctx, att, rb);
       }
@@ -559,7 +567,7 @@
       remove_attachment(ctx, att);
       if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
          /* detach stencil (depth was detached above) */
-         att = get_attachment(ctx, fb, GL_STENCIL_ATTACHMENT_EXT);
+         att = get_attachment(ctx, fb, GL_STENCIL_ATTACHMENT_EXT, NULL);
          assert(att);
          remove_attachment(ctx, att);
       }
@@ -1219,7 +1227,7 @@
       for (j = 0; j < ctx->Const.MaxDrawBuffers; j++) {
          if (fb->ColorDrawBuffer[j] != GL_NONE) {
             const struct gl_renderbuffer_attachment *att
-               = get_attachment(ctx, fb, fb->ColorDrawBuffer[j]);
+               = get_attachment(ctx, fb, fb->ColorDrawBuffer[j], NULL);
             assert(att);
             if (att->Type == GL_NONE) {
                fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT;
@@ -1232,7 +1240,7 @@
       /* Check that the ReadBuffer is present */
       if (fb->ColorReadBuffer != GL_NONE) {
          const struct gl_renderbuffer_attachment *att
-            = get_attachment(ctx, fb, fb->ColorReadBuffer);
+            = get_attachment(ctx, fb, fb->ColorReadBuffer, NULL);
          assert(att);
          if (att->Type == GL_NONE) {
             fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT;
@@ -3151,7 +3159,7 @@
    }
 
    /* Not a hash lookup, so we can afford to get the attachment here. */
-   att = get_attachment(ctx, fb, attachment);
+   att = get_attachment(ctx, fb, attachment, NULL);
    if (att == NULL) {
       _mesa_error(ctx, GL_INVALID_ENUM, "%s(invalid attachment %s)", caller,
                   _mesa_enum_to_string(attachment));
@@ -3495,7 +3503,7 @@
       return;
    }
 
-   att = get_attachment(ctx, fb, attachment);
+   att = get_attachment(ctx, fb, attachment, NULL);
    if (att == NULL) {
       _mesa_error(ctx, GL_INVALID_ENUM,
                   "%s(invalid attachment %s)", func,
@@ -3668,7 +3676,7 @@
    }
    else {
       /* user-created framebuffer FBO */
-      att = get_attachment(ctx, buffer, attachment);
+      att = get_attachment(ctx, buffer, attachment, NULL);
    }
 
    if (att == NULL) {
@@ -3692,8 +3700,8 @@
          return;
       }
       /* the depth and stencil attachments must point to the same buffer */
-      depthAtt = get_attachment(ctx, buffer, GL_DEPTH_ATTACHMENT);
-      stencilAtt = get_attachment(ctx, buffer, GL_STENCIL_ATTACHMENT);
+      depthAtt = get_attachment(ctx, buffer, GL_DEPTH_ATTACHMENT, NULL);
+      stencilAtt = get_attachment(ctx, buffer, GL_STENCIL_ATTACHMENT, NULL);
       if (depthAtt->Renderbuffer != stencilAtt->Renderbuffer) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "%s(DEPTH/STENCIL attachments differ)", caller);