From 94eff2b69a3dc662edac9984a08241d033e764d7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Scharfe?= <l.s.r@web.de>
Date: Sun, 10 Jun 2018 12:56:31 +0200
Subject: merge-recursive: use xstrdup() instead of fixed buffer

Paths can be longer than PATH_MAX.  Avoid a buffer overrun in
check_dir_renamed() by using xstrdup() to make a private copy safely.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/merge-recursive.c b/merge-recursive.c
index 13b4762..16d2377 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -2017,18 +2017,18 @@ static struct hashmap *get_directory_renames(struct diff_queue_struct *pairs,
 static struct dir_rename_entry *check_dir_renamed(const char *path,
 						  struct hashmap *dir_renames)
 {
-	char temp[PATH_MAX];
+	char *temp = xstrdup(path);
 	char *end;
-	struct dir_rename_entry *entry;
+	struct dir_rename_entry *entry = NULL;;
 
-	strcpy(temp, path);
 	while ((end = strrchr(temp, '/'))) {
 		*end = '\0';
 		entry = dir_rename_find_entry(dir_renames, temp);
 		if (entry)
-			return entry;
+			break;
 	}
-	return NULL;
+	free(temp);
+	return entry;
 }
 
 static void compute_collisions(struct hashmap *collisions,
-- 
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