[PATCH 1/2] refs/files-backend: duplicate strings added to affected_refnames

["Martin Ågren" <martin.agren@gmail.com>]

files_transaction_prepare() and the functions it calls add strings to a
string list without duplicating them, i.e., we keep the original raw
pointers we were given. That is "ok", since we keep them only for a
short-enough time, but we end up leaking some of them.

Switch to duplicating the strings, so that affected_refnames does not
leak memory. The original strings might still leak, but at least that
can now be addressed without worrying about these pointers.

No-one takes any pointers to the strings in the list (it is basically
only used to check for set membership), so it is ok for
string_list_clear to free them.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 refs/files-backend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 5cca55510..22daca2ba 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2407,7 +2407,7 @@ static int files_transaction_prepare(struct ref_store *ref_store,
 			       "ref_transaction_prepare");
 	size_t i;
 	int ret = 0;
-	struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
+	struct string_list affected_refnames = STRING_LIST_INIT_DUP;
 	char *head_ref = NULL;
 	int head_type;
 	struct object_id head_oid;
-- 
2.14.1.151.g45c1275a3.dirty