[PATCH] blame: drop strdup of string literal

[Jeff King <peff@peff.net>]

On Tue, Jun 14, 2016 at 01:05:41AM -0400, Jeff King wrote:

> On Tue, Jun 14, 2016 at 12:32:15AM -0400, Eric Sunshine wrote:
> 
> > > +       struct string_list range_list = STRING_LIST_INIT_NODUP;
> > 
> > Related to this series, there's an additional "fix" which ought to be
> > made, probably as a separate patch. In particular, in cmd_blame():
> > 
> >     if (lno && !range_list.nr)
> >         string_list_append(&range_list, xstrdup("1"));
> > 
> > which supplies a default range ("line 1 through end of file") if -L
> > was not specified. I used xstrdup() on the literal "1" in 58dbfa2
> > (blame: accept multiple -L ranges, 2013-08-06) to be consistent with
> > parse_opt_string_list() which was unconditionally xstrdup'ing the
> > argument (but no longer does as of patch 1/3 of this series).
> 
> Yeah, I'd agree that this is a minor bug both before and after the
> series due to the leak. Want to roll a patch on top?

Here it is, just to tie up a loose end. I marked you as the author since
the hard part was noticing the issue and explaining the history, which
you already did above.

-- >8 --
From: Eric Sunshine <sunshine@sunshineco.com>
Subject: [PATCH] blame: drop strdup of string literal

This strdup was added as part of 58dbfa2 (blame: accept
multiple -L ranges, 2013-08-06) to be consistent with
parse_opt_string_list(), which appends to the same list.

But as of 7a7a517 (parse_opt_string_list: stop allocating
new strings, 2016-06-13), we should stop using strdup (to
match parse_opt_string_list, and for all the reasons
described in that commit; namely that it does nothing useful
and causes us to leak the memory).

Signed-off-by: Jeff King <peff@peff.net>
---
 builtin/blame.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/blame.c b/builtin/blame.c
index ab66cde..29bd479 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -2805,7 +2805,7 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 	lno = prepare_lines(&sb);
 
 	if (lno && !range_list.nr)
-		string_list_append(&range_list, xstrdup("1"));
+		string_list_append(&range_list, "1");
 
 	anchor = 1;
 	range_set_init(&ranges, range_list.nr);
-- 
2.9.2.670.g42e63de