Merge branch 'ab/plug-random-leaks'

Double-free fix for a recently merged topic.

* ab/plug-random-leaks:
  diff.c: fix a double-free regression in a18d66cefb
  tests: demonstrate "show --word-diff --color-moved" regression

diff.c

@@ -800,6 +800,14 @@ static void append_emitted_diff_symbol(struct diff_options *o,
 	f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
 }
 
+static void free_emitted_diff_symbols(struct emitted_diff_symbols *e)
+{
+	if (!e)
+		return;
+	free(e->buf);
+	free(e);
+}
+
 struct moved_entry {
 	const struct emitted_diff_symbol *es;
 	struct moved_entry *next_line;
@@ -2150,7 +2158,6 @@ static void diff_words_flush(struct emit_callback *ecbdata)
 
 		for (i = 0; i < wol->nr; i++)
 			free((void *)wol->buf[i].line);
-		free(wol->buf);
 
 		wol->nr = 0;
 	}
@@ -2228,7 +2235,7 @@ static void free_diff_words_data(struct emit_callback *ecbdata)
 {
 	if (ecbdata->diff_words) {
 		diff_words_flush(ecbdata);
-		free (ecbdata->diff_words->opt->emitted_symbols);
+		free_emitted_diff_symbols(ecbdata->diff_words->opt->emitted_symbols);
 		free (ecbdata->diff_words->opt);
 		free (ecbdata->diff_words->minus.text.ptr);
 		free (ecbdata->diff_words->minus.orig);

t/t4015-diff-whitespace.sh

@@ -6,6 +6,8 @@
 test_description='Test special whitespace in diff engine.
 
 '
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
@@ -1622,7 +1624,7 @@ test_expect_success 'cmd option assumes configured colored-moved' '
 	test_cmp expected actual
 '
 
-test_expect_success 'no effect from --color-moved with --word-diff' '
+test_expect_success 'no effect on diff from --color-moved with --word-diff' '
 	cat <<-\EOF >text.txt &&
 	Lorem Ipsum is simply dummy text of the printing and typesetting industry.
 	EOF
@@ -1636,6 +1638,12 @@ test_expect_success 'no effect from --color-moved with --word-diff' '
 	test_cmp expect actual
 '
 
+test_expect_success !SANITIZE_LEAK 'no effect on show from --color-moved with --word-diff' '
+	git show --color-moved --word-diff >actual &&
+	git show --word-diff >expect &&
+	test_cmp expect actual
+'
+
 test_expect_success 'set up whitespace tests' '
 	git reset --hard &&
 	# Note that these lines have no leading or trailing whitespace.
@@ -2016,7 +2024,7 @@ test_expect_success '--color-moved rewinds for MIN_ALNUM_COUNT' '
 	test_cmp expected actual
 '
 
-test_expect_success 'move detection with submodules' '
+test_expect_success !SANITIZE_LEAK 'move detection with submodules' '
 	test_create_repo bananas &&
 	echo ripe >bananas/recipe &&
 	git -C bananas add recipe &&