safe_create_leading_directories: fix race that could give a false negative

diff --git a/builtin/grep.c b/builtin/grep.c
index 8aea00c04840552d8d9912195609883ed0dc6bb2..0654e0b0f693f9cdd4ba2d7f84c110f7ef8b11b4 100644 (file)
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -209,6 +209,7 @@ static void start_threads(struct grep_opt *opt)
                int err;
                struct grep_opt *o = grep_opt_dup(opt);
                o->output = strbuf_out;
+               o->debug = 0;
                compile_grep_patterns(o);
                err = pthread_create(&threads[i], NULL, run, o);
 
@@ -931,7 +932,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
        if (!seen_dashdash) {
                int j;
                for (j = i; j < argc; j++)
-                       verify_filename(prefix, argv[j]);
+                       verify_filename(prefix, argv[j], j == i);
        }
 
        paths = get_pathspec(prefix, argv + i);