From 07437fa3bdd88a51c497aeaa7ee4dce8c2724579 Mon Sep 17 00:00:00 2001
From: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Date: Tue, 19 Apr 2022 16:06:44 -0400
Subject: [PATCH] util/draw: handle draw_count=0 when reading indirect
 parameters
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Fixes: 3eb99323172 ("aux/draw: add a util function for reading back indirect draw params")

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15963>
---
 src/gallium/auxiliary/util/u_draw.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_draw.c b/src/gallium/auxiliary/util/u_draw.c
index 7072158..273724f 100644
--- a/src/gallium/auxiliary/util/u_draw.c
+++ b/src/gallium/auxiliary/util/u_draw.c
@@ -154,6 +154,10 @@ util_draw_indirect_read(struct pipe_context *pipe,
          draw_count = dc_param[0];
       pipe_buffer_unmap(pipe, dc_transfer);
    }
+   if (!draw_count) {
+      *num_draws = draw_count;
+      return NULL;
+   }
    draws = malloc(sizeof(struct u_indirect_params) * draw_count);
    if (!draws)
       return NULL;
-- 
2.7.4