[intel] Allow attIndex to be negative to avoid defeating the >= 0 check.

Otherwise, we would go wildly out of bounds if passed -1 (no renderbuffer), such
as while doing LOCK_HARDWARE with glDrawBuffer(GL_NONE).

2 files changed, 2 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_fbo.c b/src/mesa/drivers/dri/intel/intel_fbo.c
index c430e90382..94d499f001 100644
--- a/src/mesa/drivers/dri/intel/intel_fbo.c
+++ b/src/mesa/drivers/dri/intel/intel_fbo.c
@@ -69,7 +69,7 @@ intel_renderbuffer(struct gl_renderbuffer *rb)
 
 
 struct intel_renderbuffer *
-intel_get_renderbuffer(struct gl_framebuffer *fb, GLuint attIndex)
+intel_get_renderbuffer(struct gl_framebuffer *fb, int attIndex)
 {
    if (attIndex >= 0)
       return intel_renderbuffer(fb->Attachment[attIndex].Renderbuffer);
diff --git a/src/mesa/drivers/dri/intel/intel_fbo.h b/src/mesa/drivers/dri/intel/intel_fbo.h
index 2fda7dca00..c90c84b48c 100644
--- a/src/mesa/drivers/dri/intel/intel_fbo.h
+++ b/src/mesa/drivers/dri/intel/intel_fbo.h
@@ -98,7 +98,7 @@ extern void intel_fbo_init(struct intel_context *intel);
 /* XXX make inline or macro */
 extern struct intel_renderbuffer *intel_get_renderbuffer(struct gl_framebuffer
                                                          *fb,
-                                                         GLuint attIndex);
+                                                         int attIndex);
 
 extern void intel_flip_renderbuffers(struct intel_framebuffer *intel_fb);