Re: [PATCH v11 0/8] submodule inline diff format

[Jacob Keller <jacob.e.keller@intel.com>]

From: Jacob Keller <jacob.keller@gmail.com>

> On Fri, Aug 26, 2016 at 1:04 PM, Jeff King <peff@peff.net> wrote:
> > On Fri, Aug 26, 2016 at 07:58:07PM +0000, Keller, Jacob E wrote:
> >
> >> > >  char *git_pathdup_submodule(const char *path, const char *fmt,
> >> > > ...)
> >> > >  {
> >> > > +       int err;
> >> > >         va_list args;
> >> > >         struct strbuf buf = STRBUF_INIT;
> >> > >         va_start(args, fmt);
> >> > > -       do_submodule_path(&buf, path, fmt, args);
> >> > > +       err = do_submodule_path(&buf, path, fmt, args);
> >> > >         va_end(args);
> >> > > +       if (err)
> >> >
> >> > Here we need a strbuf_release(&buf) to avoid a memory leak?
> >>
> >> No, cause we "strbuf_detach" after this to return the buffer? Or is
> >> that not safe?
> >
> > That code path is OK. I think the question is whether you need to
> > release the buffer in the "err" case where you return NULL and don't hit
> > the strbuf_detach.
> >
> > IOW, does do_submodule_path() promise that when it returns an error,
> > "buf" has been left uninitialized? Some of our strbuf functions do, but
> > I do not know offhand about do_submodule_path().
> >
> > -Peff
> 
> We probably should release for the error case. I'll do that. I don't
> believe do_submodule_path ensures that the passed in argument is
> guaranteed to not be initialized or used.
> 
> Thanks,
> Jake

Here's the squash for this fix.

Thanks,
Jake

---------->8

From Jacob Keller <jacob.keller@gmail.com>
From 9cf89634e6f2b0f3f90f43a553f55eb57bb2f662 Mon Sep 17 00:00:00 2001
From: Jacob Keller <jacob.keller@gmail.com>
Date: Fri, 26 Aug 2016 16:06:54 -0700
Subject: [PATCH] squash! allow do_submodule_path to work even if submodule
 isn't checked out

Add a missing strbuf_release() when returning during the error flow of
git_pathdup_submodule().

Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
---
 path.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/path.c b/path.c
index e9369f75319d..b8515973252c 100644
--- a/path.c
+++ b/path.c
@@ -525,8 +525,10 @@ char *git_pathdup_submodule(const char *path, const char *fmt, ...)
 	va_start(args, fmt);
 	err = do_submodule_path(&buf, path, fmt, args);
 	va_end(args);
-	if (err)
+	if (err) {
+		strbuf_release(&buf);
 		return NULL;
+	}
 	return strbuf_detach(&buf, NULL);
 }
 
-- 
2.10.0.rc0.259.g83512d9