From 9a6e4f032ef7ca45a71639ff5e60cbb9b8a6e556 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 28 Oct 2015 10:07:25 -0400
Subject: [PATCH] add_submodule_odb: initialize alt_odb list earlier
The add_submodule_odb function tries to add a submodule's
object store as an "alternate". It needs the existing list
to be initialized (from the objects/info/alternates file)
for two reasons:
1. We look for duplicates with the existing alternate
stores, but obviously this doesn't work if we haven't
loaded any yet.
2. We link our new entry into the list by prepending it to
alt_odb_list. But we do _not_ modify alt_odb_tail.
This variable starts as NULL, and is a signal to the
alt_odb code that the list has not yet been
initialized.
We then call read_info_alternates on the submodule (to
recursively load its alternates), which will try to
append to that tail, assuming it has been initialized.
This causes us to segfault if it is NULL.
This rarely comes up in practice, because we will have
initialized the alt_odb any time we do an object lookup. So
you can trigger this only when:
- you try to access a submodule (e.g., a diff with
diff.submodule=log)
- the access happens before any other object has been
accessed (e.g., because the diff is between the working
tree and the index)
- the submodule contains an alternates file (so we try to
add an entry to the NULL alt_odb_tail)
To fix this, we just need to call prepare_alt_odb at the
start of the function (and if we have already initialized,
it is a noop).
Note that we can remove the prepare_alt_odb call from the
end. It is guaranteed to be a noop, since we will have
called it earlier.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
submodule.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/submodule.c b/submodule.c
index b63978a161c..30e1d5bc836 100644
--- a/submodule.c
+++ b/submodule.c
@@ -49,6 +49,7 @@ static int add_submodule_odb(const char *path)
goto done;
}
/* avoid adding it twice */
+ prepare_alt_odb();
for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
if (alt_odb->name - alt_odb->base == objects_directory.len &&
!strncmp(alt_odb->base, objects_directory.buf,
@@ -66,7 +67,6 @@ static int add_submodule_odb(const char *path)
/* add possible alternates from the submodule */
read_info_alternates(objects_directory.buf, 0);
- prepare_alt_odb();
done:
strbuf_release(&objects_directory);
return ret;