diff --git a/builtin/diff.c b/builtin/diff.c
index 9b6cdabe15..6eac445579 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -388,6 +388,11 @@ static void symdiff_prepare(struct rev_info *rev, struct symdiff *sym)
 	sym->skip = map;
 }
 
+static void symdiff_release(struct symdiff *sdiff)
+{
+	bitmap_free(sdiff->skip);
+}
+
 int cmd_diff(int argc, const char **argv, const char *prefix)
 {
 	int i;
@@ -619,6 +624,7 @@ 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 () {