From ca002a3389877f5e150659649e27e7ae59d7d402 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage.weil@dreamhost.com>
Date: Thu, 8 Dec 2011 08:01:12 -0800
Subject: [PATCH] crush: fix stepping on unallocated memory

If size is 0 we can't write here.

Reported-by: pankaj singh <psingh.ait@gmail.com>
Signed-off-by: Sage Weil <sage.weil@dreamhost.com>
---
 src/crush/builder.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/crush/builder.c b/src/crush/builder.c
index c3382692c99cc..ce1f21bc449f5 100644
--- a/src/crush/builder.c
+++ b/src/crush/builder.c
@@ -317,7 +317,8 @@ int crush_calc_straw(struct crush_bucket_straw *bucket)
 
 	/* reverse sort by weight (simple insertion sort) */
 	reverse = malloc(sizeof(int) * size);
-	reverse[0] = 0;
+	if (size)
+		reverse[0] = 0;
 	for (i=1; i<size; i++) {
 		for (j=0; j<i; j++) {
 			if (weights[i] < weights[reverse[j]]) {
-- 
2.39.5