[PATCH v3 22/22] builtin/diff: free symmetric diff members

[Patrick Steinhardt <ps@pks.im>]

We populate a `struct symdiff` in case the user has requested a
symmetric diff. Part of this is to populate a `skip` bitmap that
indicates which commits shall be ignored in the diff. But while this
bitmap is dynamically allocated, we never free it.

Fix this by introducing and calling a new `symdiff_release()` function
that does this for us.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 builtin/diff.c                       | 10 +++++++++-
 t/t4068-diff-symmetric-merge-base.sh |  1 +
 t/t4108-apply-threeway.sh            |  1 +
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/builtin/diff.c b/builtin/diff.c
index 9b6cdabe15..f87f68a5bc 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -388,6 +388,13 @@ static void symdiff_prepare(struct rev_info *rev, struct symdiff *sym)
 	sym->skip = map;
 }
 
+static void symdiff_release(struct symdiff *sdiff)
+{
+	if (!sdiff)
+		return;
+	bitmap_free(sdiff->skip);
+}
+
 int cmd_diff(int argc, const char **argv, const char *prefix)
 {
 	int i;
@@ -398,7 +405,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 	struct object_array_entry *blob[2];
 	int nongit = 0, no_index = 0;
 	int result;
-	struct symdiff sdiff;
+	struct symdiff sdiff = {0};
 
 	/*
 	 * We could get N tree-ish in the rev.pending_objects list.
@@ -619,6 +626,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 		refresh_index_quietly();
 	release_revisions(&rev);
 	object_array_clear(&ent);
+	symdiff_release(&sdiff);
 	UNLEAK(blob);
 	return result;
 }
diff --git a/t/t4068-diff-symmetric-merge-base.sh b/t/t4068-diff-symmetric-merge-base.sh
index eff63c16b0..4d6565e728 100755
--- a/t/t4068-diff-symmetric-merge-base.sh
+++ b/t/t4068-diff-symmetric-merge-base.sh
@@ -5,6 +5,7 @@ test_description='behavior of diff with symmetric-diff setups and --merge-base'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # build these situations:
diff --git a/t/t4108-apply-threeway.sh b/t/t4108-apply-threeway.sh
index c558282bc0..3211e1e65f 100755
--- a/t/t4108-apply-threeway.sh
+++ b/t/t4108-apply-threeway.sh
@@ -5,6 +5,7 @@ test_description='git apply --3way'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 print_sanitized_conflicted_diff () {
-- 
2.46.0.46.g406f326d27.dirty