st/mesa: Initialize textures array in st_framebuffer_validate

And just reference pipe_resources to it in the validate callbacks.

Avoids pipe_resource leaks when st_framebuffer_validate ends up calling
the validate callback multiple times, e.g. when a window is resized.

v2:
* Use generic stable tag instead of Fixes: tag, since the problem could
  already happen before the commit referenced in v1 (Thomas Hellstrom)
* Use memset to initialize the array on the stack instead of allocating
  the array with os_calloc.

Cc: [email protected]
Reviewed-by: Thomas Hellstrom <[email protected]>

6 files changed, 7 insertions, 12 deletions

diff --git a/src/gallium/state_trackers/dri/dri_drawable.c b/src/gallium/state_trackers/dri/dri_drawable.c
index 75a8197d330..d586b7564ef 100644
--- a/src/gallium/state_trackers/dri/dri_drawable.c
+++ b/src/gallium/state_trackers/dri/dri_drawable.c
@@ -99,10 +99,8 @@ dri_st_framebuffer_validate(struct st_context_iface *stctx,
       return TRUE;
 
    /* Set the window-system buffers for the state tracker. */
-   for (i = 0; i < count; i++) {
-      out[i] = NULL;
+   for (i = 0; i < count; i++)
       pipe_resource_reference(&out[i], textures[statts[i]]);
-   }
 
    return TRUE;
 }
diff --git a/src/gallium/state_trackers/glx/xlib/xm_st.c b/src/gallium/state_trackers/glx/xlib/xm_st.c
index 0c42e653c76..946b5dcff29 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_st.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_st.c
@@ -245,10 +245,8 @@ xmesa_st_framebuffer_validate(struct st_context_iface *stctx,
       }
    }
 
-   for (i = 0; i < count; i++) {
-      out[i] = NULL;
+   for (i = 0; i < count; i++)
       pipe_resource_reference(&out[i], xstfb->textures[statts[i]]);
-   }
 
    return TRUE;
 }
diff --git a/src/gallium/state_trackers/hgl/hgl.c b/src/gallium/state_trackers/hgl/hgl.c
index 1b702815a3a..bbc477a978c 100644
--- a/src/gallium/state_trackers/hgl/hgl.c
+++ b/src/gallium/state_trackers/hgl/hgl.c
@@ -193,10 +193,8 @@ hgl_st_framebuffer_validate(struct st_context_iface *stctxi,
 		//}
 	}
 
-	for (i = 0; i < count; i++) {
-		out[i] = NULL;
+	for (i = 0; i < count; i++)
 		pipe_resource_reference(&out[i], buffer->textures[statts[i]]);
-	}
 
 	return TRUE;
 }
diff --git a/src/gallium/state_trackers/osmesa/osmesa.c b/src/gallium/state_trackers/osmesa/osmesa.c
index 2f9558db312..44a0cc43812 100644
--- a/src/gallium/state_trackers/osmesa/osmesa.c
+++ b/src/gallium/state_trackers/osmesa/osmesa.c
@@ -432,6 +432,7 @@ osmesa_st_framebuffer_validate(struct st_context_iface *stctx,
 
       templat.format = format;
       templat.bind = bind;
+      pipe_resource_reference(&out[i], NULL);
       out[i] = osbuffer->textures[statts[i]] =
          screen->resource_create(screen, &templat);
    }
diff --git a/src/gallium/state_trackers/wgl/stw_st.c b/src/gallium/state_trackers/wgl/stw_st.c
index 5e165c89f56..7cf18f0a8b0 100644
--- a/src/gallium/state_trackers/wgl/stw_st.c
+++ b/src/gallium/state_trackers/wgl/stw_st.c
@@ -161,10 +161,8 @@ stw_st_framebuffer_validate(struct st_context_iface *stctx,
       stwfb->fb->must_resize = FALSE;
    }
 
-   for (i = 0; i < count; i++) {
-      out[i] = NULL;
+   for (i = 0; i < count; i++)
       pipe_resource_reference(&out[i], stwfb->textures[statts[i]]);
-   }
 
    stw_framebuffer_unlock(stwfb->fb);
 
diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
index aef87ea8b75..eebde621837 100644
--- a/src/mesa/state_tracker/st_manager.c
+++ b/src/mesa/state_tracker/st_manager.c
@@ -190,6 +190,8 @@ st_framebuffer_validate(struct st_framebuffer *stfb,
    if (stfb->iface_stamp == new_stamp)
       return;
 
+   memset(textures, 0, stfb->num_statts * sizeof(textures[0]));
+
    /* validate the fb */
    do {
       if (!stfb->iface->validate(&st->iface, stfb->iface, stfb->statts,