In update_working_directory(), we take in a pattern_list, attach it to
the repository index by assigning it to index->sparse_checkout_patterns,
and then call unpack_trees. Afterwards, we remove it by setting
index->sparse_checkout_patterns back to NULL.
But there are two possible leaks here:
1. If the index already had a populated sparse_checkout_patterns,
we've obliterated it. We can fix this by saving and restoring it,
rather than always setting it back to NULL.
2. We may call the function with a NULL pattern_list, expecting it to
use the on-disk sparse file. In that case, the index routines will
lazy-load the sparse patterns automatically. But now at the end of
the function when we restore the patterns, we'll leak those
lazy-loaded ones!
We can fix this by freeing the pattern list before overwriting its
pointer whenever it does not match what was passed in (in practice
this should only happen when the passed-in list is NULL, but this
is erring on the defensive side).
Together these remove 48 indirect leaks found in t1091.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
builtin/sparse-checkout.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
index 8f8f5c359f..356b7349f9 100644
--- a/builtin/sparse-checkout.c
+++ b/builtin/sparse-checkout.c
@@ -205,11 +205,13 @@ static int update_working_directory(struct pattern_list *pl)
struct unpack_trees_options o;
struct lock_file lock_file = LOCK_INIT;
struct repository *r = the_repository;
+ struct pattern_list *old_pl;
/* If no branch has been checked out, there are no updates to make. */
if (is_index_unborn(r->index))
return UPDATE_SPARSITY_SUCCESS;
+ old_pl = r->index->sparse_checkout_patterns;
r->index->sparse_checkout_patterns = pl;
memset(&o, 0, sizeof(o));
@@ -241,7 +243,12 @@ static int update_working_directory(struct pattern_list *pl)
clean_tracked_sparse_directories(r);
- r->index->sparse_checkout_patterns = NULL;
+ if (r->index->sparse_checkout_patterns != pl) {
+ clear_pattern_list(r->index->sparse_checkout_patterns);
+ FREE_AND_NULL(r->index->sparse_checkout_patterns);
+ } else {
+ r->index->sparse_checkout_patterns = old_pl;
+ }
return result;
}
--
2.45.1.727.ge984192922
