[PATCH 22/24] revisions API: call diff_free(&revs->pruning) in revisions_release()

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Call diff_free() on the "pruning" member of "struct rev_info". We'll
handle the "diffopt" member of the same type some other time, doing so
will require us to untangle the "no_free" conditions I added in
e900d494dcf (diff: add an API for deferred freeing, 2021-02-11).

Even without "diffopt" addressing leaks in "pruning" makes several
tests pass under SANITIZE=leak.

This was also the last missing piece that allows us to remove the
UNLEAK() in "cmd_diff" and "cmd_diff_index", which allows us to use
those commands as a canary for general leaks in the revisions API. See
[1] for further rationale, and 886e1084d78 (builtin/: add UNLEAKs,
2017-10-01) for the commit that added the UNLEAK() there.

1. https://lore.kernel.org/git/220218.861r00ib86.gmgdl@evledraar.gmail.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/diff-index.c                | 1 -
 builtin/diff.c                      | 1 -
 revision.c                          | 2 ++
 t/t2016-checkout-patch.sh           | 1 +
 t/t4039-diff-assume-unchanged.sh    | 1 +
 t/t4206-log-follow-harder-copies.sh | 2 ++
 t/t6131-pathspec-icase.sh           | 2 ++
 7 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/builtin/diff-index.c b/builtin/diff-index.c
index 3a83183c312..7d158af6b6d 100644
--- a/builtin/diff-index.c
+++ b/builtin/diff-index.c
@@ -70,7 +70,6 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix)
 		return -1;
 	}
 	result = run_diff_index(&rev, option);
-	UNLEAK(rev);
 	result = diff_result_code(&rev.diffopt, result);
 	release_revisions(&rev);
 	return result;
diff --git a/builtin/diff.c b/builtin/diff.c
index dd48336da56..f539132ac68 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -594,7 +594,6 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 	result = diff_result_code(&rev.diffopt, result);
 	if (1 < rev.diffopt.skip_stat_unmatch)
 		refresh_index_quietly();
-	UNLEAK(rev);
 	release_revisions(&rev);
 	UNLEAK(ent);
 	UNLEAK(blob);
diff --git a/revision.c b/revision.c
index ec6cd662467..81f4a36fc9d 100644
--- a/revision.c
+++ b/revision.c
@@ -2956,6 +2956,8 @@ void release_revisions(struct rev_info *revs)
 	clear_pathspec(&revs->prune_data);
 	release_revisions_mailmap(revs->mailmap);
 	free_grep_patterns(&revs->grep_filter);
+	/* TODO (need to handle "no_free"): diff_free(&revs->diffopt) */
+	diff_free(&revs->pruning);
 	reflog_walk_info_release(revs->reflog_info);
 }
 
diff --git a/t/t2016-checkout-patch.sh b/t/t2016-checkout-patch.sh
index abfd586c32b..83c246ab0a5 100755
--- a/t/t2016-checkout-patch.sh
+++ b/t/t2016-checkout-patch.sh
@@ -2,6 +2,7 @@
 
 test_description='git checkout --patch'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-patch-mode.sh
 
 test_expect_success PERL 'setup' '
diff --git a/t/t4039-diff-assume-unchanged.sh b/t/t4039-diff-assume-unchanged.sh
index 0eb0314a8b3..78090e6852d 100755
--- a/t/t4039-diff-assume-unchanged.sh
+++ b/t/t4039-diff-assume-unchanged.sh
@@ -2,6 +2,7 @@
 
 test_description='diff with assume-unchanged entries'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # external diff has been tested in t4020-diff-external.sh
diff --git a/t/t4206-log-follow-harder-copies.sh b/t/t4206-log-follow-harder-copies.sh
index 4871a5dc92f..33ecf82c7f9 100755
--- a/t/t4206-log-follow-harder-copies.sh
+++ b/t/t4206-log-follow-harder-copies.sh
@@ -6,6 +6,8 @@
 test_description='Test --follow should always find copies hard in git log.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
diff --git a/t/t6131-pathspec-icase.sh b/t/t6131-pathspec-icase.sh
index 39fc3f6769b..770cce026cb 100755
--- a/t/t6131-pathspec-icase.sh
+++ b/t/t6131-pathspec-icase.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test case insensitive pathspec limiting'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 if test_have_prereq CASE_INSENSITIVE_FS
-- 
2.35.1.1295.g6b025d3e231