revision: free diff options

There is a todo comment in `release_revisions()` that mentions that we
need to free the diff options, which was added via 54c8a7c379 (revisions
API: add a TODO for diff_free(&revs->diffopt), 2022-04-14). Releasing
the diff options wasn't quite feasible at that time because some call
sites rely on its contents to remain even after the revisions have been
released.

In fact, there really only are a couple of callsites that misbehave
here:

  - `cmd_shortlog()` releases the revisions, but continues to access its
    file pointer.

  - `do_diff_cache()` creates a shallow copy of `struct diff_options`,
    but does not set the `no_free` member. Consequently, we end up
    releasing resources of the caller-provided diff options.

  - `diff_free()` and friends do not play nice when being called
    multiple times as they don't unset data structures that they have
    just released.

Fix all of those cases and enable the call to `diff_free()`, which plugs
a bunch of memory leaks.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

11 files changed, 17 insertions, 7 deletions

diff --git a/builtin/shortlog.c b/builtin/shortlog.c
index d4daf31e22..5bde7c68c2 100644
--- a/builtin/shortlog.c
+++ b/builtin/shortlog.c
@@ -460,11 +460,8 @@ parse_done:
 	else
 		get_from_rev(&rev, &log);
 
-	release_revisions(&rev);
-
 	shortlog_output(&log);
-	if (log.file != stdout)
-		fclose(log.file);
+	release_revisions(&rev);
 	return 0;
 }
 
diff --git a/diff-lib.c b/diff-lib.c
index 5a5a50c5a1..1cbf03bf39 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -662,9 +662,11 @@ int do_diff_cache(const struct object_id *tree_oid, struct diff_options *opt)
 	repo_init_revisions(opt->repo, &revs, NULL);
 	copy_pathspec(&revs.prune_data, &opt->pathspec);
 	revs.diffopt = *opt;
+	revs.diffopt.no_free = 1;
 
 	if (diff_cache(&revs, tree_oid, NULL, 1))
 		exit(128);
+
 	release_revisions(&revs);
 	return 0;
 }
diff --git a/diff.c b/diff.c
index e70301df76..53e2f5a42e 100644
--- a/diff.c
+++ b/diff.c
@@ -6649,8 +6649,10 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
 
 static void diff_free_file(struct diff_options *options)
 {
-	if (options->close_file)
+	if (options->close_file && options->file) {
 		fclose(options->file);
+		options->file = NULL;
+	}
 }
 
 static void diff_free_ignore_regex(struct diff_options *options)
@@ -6661,7 +6663,9 @@ static void diff_free_ignore_regex(struct diff_options *options)
 		regfree(options->ignore_regex[i]);
 		free(options->ignore_regex[i]);
 	}
-	free(options->ignore_regex);
+
+	FREE_AND_NULL(options->ignore_regex);
+	options->ignore_regex_nr = 0;
 }
 
 void diff_free(struct diff_options *options)
diff --git a/revision.c b/revision.c
index 82c0aadb42..99c75c939d 100644
--- a/revision.c
+++ b/revision.c
@@ -3191,7 +3191,7 @@ void release_revisions(struct rev_info *revs)
 	release_revisions_mailmap(revs->mailmap);
 	free_grep_patterns(&revs->grep_filter);
 	graph_clear(revs->graph);
-	/* TODO (need to handle "no_free"): diff_free(&revs->diffopt) */
+	diff_free(&revs->diffopt);
 	diff_free(&revs->pruning);
 	reflog_walk_info_release(revs->reflog_info);
 	release_revisions_topo_walk_info(revs->topo_walk_info);
diff --git a/t/t4208-log-magic-pathspec.sh b/t/t4208-log-magic-pathspec.sh
index 806b2809d4..2a46eb6bed 100755
--- a/t/t4208-log-magic-pathspec.sh
+++ b/t/t4208-log-magic-pathspec.sh
@@ -5,6 +5,7 @@ test_description='magic pathspec tests using git-log'
 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' '
diff --git a/t/t6000-rev-list-misc.sh b/t/t6000-rev-list-misc.sh
index 6289a2e8b0..f6d17ee902 100755
--- a/t/t6000-rev-list-misc.sh
+++ b/t/t6000-rev-list-misc.sh
@@ -5,6 +5,7 @@ test_description='miscellaneous rev-list tests'
 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 '
diff --git a/t/t6001-rev-list-graft.sh b/t/t6001-rev-list-graft.sh
index 73a2465aa0..3553bbbfe7 100755
--- a/t/t6001-rev-list-graft.sh
+++ b/t/t6001-rev-list-graft.sh
@@ -5,6 +5,7 @@ test_description='Revision traversal vs grafts and path limiter'
 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 '
diff --git a/t/t6013-rev-list-reverse-parents.sh b/t/t6013-rev-list-reverse-parents.sh
index 39793cbbd6..4128269c1d 100755
--- a/t/t6013-rev-list-reverse-parents.sh
+++ b/t/t6013-rev-list-reverse-parents.sh
@@ -5,6 +5,7 @@ test_description='--reverse combines with --parents'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 
diff --git a/t/t6017-rev-list-stdin.sh b/t/t6017-rev-list-stdin.sh
index 4821b90e74..a0a40fe55c 100755
--- a/t/t6017-rev-list-stdin.sh
+++ b/t/t6017-rev-list-stdin.sh
@@ -8,6 +8,7 @@ test_description='log family learns --stdin'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check () {
diff --git a/t/t9500-gitweb-standalone-no-errors.sh b/t/t9500-gitweb-standalone-no-errors.sh
index 7679780fb8..ccfa415384 100755
--- a/t/t9500-gitweb-standalone-no-errors.sh
+++ b/t/t9500-gitweb-standalone-no-errors.sh
@@ -13,6 +13,7 @@ or warnings to log.'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gitweb.sh
 
 # ----------------------------------------------------------------------
diff --git a/t/t9502-gitweb-standalone-parse-output.sh b/t/t9502-gitweb-standalone-parse-output.sh
index 81d5625557..b41ea19331 100755
--- a/t/t9502-gitweb-standalone-parse-output.sh
+++ b/t/t9502-gitweb-standalone-parse-output.sh
@@ -13,6 +13,7 @@ in the HTTP header or the actual script output.'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gitweb.sh
 
 # ----------------------------------------------------------------------