archive.c: avoid access to the_index

diff --git a/tree-walk.c b/tree-walk.c
index 8f5090862b5193db135f18854974b21e75eb8ae4..77b37f36fa1bc8fae48231d35514b88d51902488 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -2,6 +2,7 @@
 #include "tree-walk.h"
 #include "unpack-trees.h"
 #include "dir.h"
+#include "object-store.h"
 #include "tree.h"
 #include "pathspec.h"
 
@@ -26,8 +27,9 @@ static int decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned l
 {
        const char *path;
        unsigned int mode, len;
+       const unsigned hashsz = the_hash_algo->rawsz;
 
-       if (size < 23 || buf[size - 21]) {
+       if (size < hashsz + 3 || buf[size - (hashsz + 1)]) {
                strbuf_addstr(err, _("too-short tree object"));
                return -1;
        }