test-dump-cache-tree: avoid overflow of cache-tree name

When dumping a cache-tree, we sprintf sub-tree names directly
into a fixed-size buffer, which can overflow. We can
trivially fix this by converting to xsnprintf to at least
notice and die.

This probably should handle arbitrary-sized names, but
there's not much point. It's used only by the test scripts,
so the trivial fix is enough.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/test-dump-cache-tree.c b/test-dump-cache-tree.c
index 54c0872fcb18edb4ca28a63fdfd4be3a17df388e..bb53c0aa655c7a2df09638024b304a79e8b07fc6 100644 (file)
--- a/test-dump-cache-tree.c
+++ b/test-dump-cache-tree.c
@@ -47,7 +47,7 @@ static int dump_cache_tree(struct cache_tree *it,
                struct cache_tree_sub *rdwn;
 
                rdwn = cache_tree_sub(ref, down->name);
-               sprintf(path, "%s%.*s/", pfx, down->namelen, down->name);
+               xsnprintf(path, sizeof(path), "%s%.*s/", pfx, down->namelen, down->name);
                if (dump_cache_tree(down->cache_tree, rdwn->cache_tree, path))
                        errs = 1;
        }