From a2678df335f3404bc5d96683fa36b8cfab7946b0 Mon Sep 17 00:00:00 2001
From: Stefan Naewe <stefan.naewe@gmail.com>
Date: Sat, 5 Dec 2015 16:27:24 +0100
Subject: [PATCH] revision.c: fix possible null pointer arithmetic

mark_tree_uninteresting() dereferences a tree pointer before
checking if the pointer is valid. Fix that by doing the check first.

Signed-off-by: Stefan Naewe <stefan.naewe@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 revision.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/revision.c b/revision.c
index 9b9d77dc43..7f4acad456 100644
--- a/revision.c
+++ b/revision.c
@@ -131,10 +131,12 @@ static void mark_tree_contents_uninteresting(struct tree *tree)
 
 void mark_tree_uninteresting(struct tree *tree)
 {
-	struct object *obj = &tree->object;
+	struct object *obj;
 
 	if (!tree)
 		return;
+
+	obj = &tree->object;
 	if (obj->flags & UNINTERESTING)
 		return;
 	obj->flags |= UNINTERESTING;
-- 
2.39.2