[PATCH 08/26] line-log: fix leak when rewriting commit parents

[Patrick Steinhardt <ps@pks.im>]

In `process_ranges_merge_commit()` we try to figure out which of the
parents can be blamed for the given line changes. When we figure out
that none of the files in the line-log have changed we assign the
complete blame to that commit and rewrite the parents of the current
commit to only use that single parent.

This is done via `commit_list_append()`, which is misleadingly _not_
appending to the list of parents. Instead, we overwrite the parents with
the blamed parent. This makes us lose track of the old pointers,
creating a memory leak.

Fix this issue by freeing the parents before we overwrite them.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 line-log.c          | 1 +
 t/t4211-line-log.sh | 1 +
 2 files changed, 2 insertions(+)

diff --git a/line-log.c b/line-log.c
index bca9bd80407..bc67b75d10d 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1237,6 +1237,7 @@ static int process_ranges_merge_commit(struct rev_info *rev, struct commit *comm
 			 * don't follow any other path in history
 			 */
 			add_line_range(rev, parents[i], cand[i]);
+			free_commit_list(commit->parents);
 			commit_list_append(parents[i], &commit->parents);
 
 			ret = 0;
diff --git a/t/t4211-line-log.sh b/t/t4211-line-log.sh
index 950451cf6a6..1d6dd982a2a 100755
--- a/t/t4211-line-log.sh
+++ b/t/t4211-line-log.sh
@@ -4,6 +4,7 @@ test_description='test log -L'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup (import history)' '
-- 
2.47.0.229.g8f8d6eee53.dirty