From 86f660b1f1dc207897281a77f969a56b2e551374 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Wed, 21 Jun 2006 04:46:05 +0200
Subject: object-refs: avoid division by zero

Currently, we don't check refs_hash_size size and happily call
lookup_object_refs() even if refs_hash_size is zero which leads to
a division by zero in hash_obj().

Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/object-refs.c b/object-refs.c
index 8afa227..a7d49c6 100644
--- a/object-refs.c
+++ b/object-refs.c
@@ -127,6 +127,9 @@ void mark_reachable(struct object *obj, unsigned int mask)
 
 	if (!track_object_refs)
 		die("cannot do reachability with object refs turned off");
+	/* nothing to lookup */
+	if (!refs_hash_size)
+		return;
 	/* If we've been here already, don't bother */
 	if (obj->flags & mask)
 		return;
-- 
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