do not segfault if make_cache_entry failed

diff --git a/reachable.c b/reachable.c
index 01760d70462927ad33c7976a50e31372863a45f9..3b1c18ff9b9060d0dd437ce89aedb8871c66c54c 100644 (file)
--- a/reachable.c
+++ b/reachable.c
@@ -15,12 +15,22 @@ static void process_blob(struct blob *blob,
 {
        struct object *obj = &blob->object;
 
+       if (!blob)
+               die("bad blob object");
        if (obj->flags & SEEN)
                return;
        obj->flags |= SEEN;
        /* Nothing to do, really .. The blob lookup was the important part */
 }
 
+static void process_gitlink(const unsigned char *sha1,
+                           struct object_array *p,
+                           struct name_path *path,
+                           const char *name)
+{
+       /* I don't think we want to recurse into this, really. */
+}
+
 static void process_tree(struct tree *tree,
                         struct object_array *p,
                         struct name_path *path,
@@ -31,6 +41,8 @@ static void process_tree(struct tree *tree,
        struct name_entry entry;
        struct name_path me;
 
+       if (!tree)
+               die("bad tree object");
        if (obj->flags & SEEN)
                return;
        obj->flags |= SEEN;
@@ -42,12 +54,13 @@ static void process_tree(struct tree *tree,
        me.elem = name;
        me.elem_len = strlen(name);
 
-       desc.buf = tree->buffer;
-       desc.size = tree->size;
+       init_tree_desc(&desc, tree->buffer, tree->size);
 
        while (tree_entry(&desc, &entry)) {
                if (S_ISDIR(entry.mode))
                        process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
+               else if (S_ISGITLINK(entry.mode))
+                       process_gitlink(entry.sha1, p, &me, entry.path);
                else
                        process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
        }
@@ -70,7 +83,8 @@ static void process_tag(struct tag *tag, struct object_array *p, const char *nam
 
        if (parse_tag(tag) < 0)
                die("bad tag object %s", sha1_to_hex(obj->sha1));
-       add_object(tag->tagged, p, NULL, name);
+       if (tag->tagged)
+               add_object(tag->tagged, p, NULL, name);
 }
 
 static void walk_commit_list(struct rev_info *revs)
@@ -141,7 +155,8 @@ static int add_one_reflog(const char *path, const unsigned char *sha1, int flag,
 static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
 {
        struct tree *tree = lookup_tree(sha1);
-       add_pending_object(revs, &tree->object, "");
+       if (tree)
+               add_pending_object(revs, &tree->object, "");
 }
 
 static void add_cache_tree(struct cache_tree *it, struct rev_info *revs)
@@ -160,6 +175,16 @@ static void add_cache_refs(struct rev_info *revs)
 
        read_cache();
        for (i = 0; i < active_nr; i++) {
+               /*
+                * The index can contain blobs and GITLINKs, GITLINKs are hashes
+                * that don't actually point to objects in the repository, it's
+                * almost guaranteed that they are NOT blobs, so we don't call
+                * lookup_blob() on them, to avoid populating the hash table
+                * with invalid information
+                */
+               if (S_ISGITLINK(active_cache[i]->ce_mode))
+                       continue;
+
                lookup_blob(active_cache[i]->sha1);
                /*
                 * We could add the blobs to the pending list, but quite
@@ -196,6 +221,7 @@ void mark_reachable_objects(struct rev_info *revs, int mark_reflog)
         * Set up the revision walk - this will move all commits
         * from the pending list to the commit walking list.
         */
-       prepare_revision_walk(revs);
+       if (prepare_revision_walk(revs))
+               die("revision walk setup failed");
        walk_commit_list(revs);
 }