[PATCH v2 06/11] prune_refs(): also free the linked list

[Michael Haggerty]

At least since v1.7, the elements of the `refs_to_prune` linked list
have been leaked. Fix the leak by teaching `prune_refs()` to free the
list elements as it processes them.

Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---
 refs/files-backend.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 3475c6f8a2..60031fe3ae 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -1057,11 +1057,17 @@ static void prune_ref(struct files_ref_store *refs, 
struct ref_to_prune *r)
        strbuf_release(&err);
 }
 
-static void prune_refs(struct files_ref_store *refs, struct ref_to_prune *r)
+/*
+ * Prune the loose versions of the references in the linked list
+ * `*refs_to_prune`, freeing the entries in the list as we go.
+ */
+static void prune_refs(struct files_ref_store *refs, struct ref_to_prune 
**refs_to_prune)
 {
-       while (r) {
+       while (*refs_to_prune) {
+               struct ref_to_prune *r = *refs_to_prune;
+               *refs_to_prune = r->next;
                prune_ref(refs, r);
-               r = r->next;
+               free(r);
        }
 }
 
@@ -1148,7 +1154,7 @@ static int files_pack_refs(struct ref_store *ref_store, 
unsigned int flags)
 
        packed_refs_unlock(refs->packed_ref_store);
 
-       prune_refs(refs, refs_to_prune);
+       prune_refs(refs, &refs_to_prune);
        strbuf_release(&err);
        return 0;
 }
-- 
2.14.1