builtin-tag.c: remove cruft

diff --git a/tag.c b/tag.c
index bbacd59a23f7994980f4bf017324833ca3d4adb3..990134fe7ab14043d40b97230571ffea109b9129 100644 (file)
--- a/tag.c
+++ b/tag.c
@@ -9,7 +9,10 @@ const char *tag_type = "tag";
 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
 {
        while (o && o->type == OBJ_TAG)
-               o = parse_object(((struct tag *)o)->tagged->sha1);
+               if (((struct tag *)o)->tagged)
+                       o = parse_object(((struct tag *)o)->tagged->sha1);
+               else
+                       o = NULL;
        if (!o && warn) {
                if (!warnlen)
                        warnlen = strlen(warn);
@@ -39,6 +42,7 @@ int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
        unsigned char sha1[20];
        const char *type_line, *tag_line, *sig_line;
        char type[20];
+       const char *start = data;
 
         if (item->object.parsed)
                 return 0;
@@ -53,11 +57,11 @@ int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
        if (memcmp("\ntype ", type_line-1, 6))
                return -1;
 
-       tag_line = strchr(type_line, '\n');
+       tag_line = memchr(type_line, '\n', size - (type_line - start));
        if (!tag_line || memcmp("tag ", ++tag_line, 4))
                return -1;
 
-       sig_line = strchr(tag_line, '\n');
+       sig_line = memchr(tag_line, '\n', size - (tag_line - start));
        if (!sig_line)
                return -1;
        sig_line++;
@@ -68,9 +72,7 @@ int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
        memcpy(type, type_line + 5, typelen);
        type[typelen] = '\0';
        taglen = sig_line - tag_line - strlen("tag \n");
-       item->tag = xmalloc(taglen + 1);
-       memcpy(item->tag, tag_line + 4, taglen);
-       item->tag[taglen] = '\0';
+       item->tag = xmemdupz(tag_line + 4, taglen);
 
        if (!strcmp(type, blob_type)) {
                item->tagged = &lookup_blob(sha1)->object;