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grep: fix a "path_list" memory leak

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Free the "path_list" used in builtin/grep.c, it was declared as
STRING_LIST_INIT_NODUP, let's change it to a STRING_LIST_INIT_DUP
since an early user in cmd_grep() appends a string passed via
parse-options.c to it, which needs to be duplicated.

Let's then convert the remaining callers to use
string_list_append_nodup() instead, allowing us to free the list.

This makes all the tests in t7811-grep-open.sh pass, 6/10 would fail
before this change. The only remaining failure would have been due to
a stray "git checkout" (which still leaks memory). In this case we can
use a "git reset --hard" instead, so let's do that, and move the
test_when_finished() above the code that would modify the relevant
file.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2021-10-22 10:55:41 +02:00 committed by Junio C Hamano
parent 96c101257b
commit b202e51b15
2 changed files with 7 additions and 5 deletions
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9
builtin/grep.c
View file

@ -401,7 +401,7 @@ static void append_path(struct grep_opt *opt, const void *data, size_t len)
if (len == 1 && *(const char *)data == '\0')
return;
string_list_append(path_list, xstrndup(data, len));
string_list_append_nodup(path_list, xstrndup(data, len));
}
static void run_pager(struct grep_opt *opt, const char *prefix)
@ -839,7 +839,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
struct grep_opt opt;
struct object_array list = OBJECT_ARRAY_INIT;
struct pathspec pathspec;
struct string_list path_list = STRING_LIST_INIT_NODUP;
struct string_list path_list = STRING_LIST_INIT_DUP;
int i;
int dummy;
int use_index = 1;
@ -1159,8 +1159,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
strbuf_addf(&buf, "+/%s%s",
strcmp("less", pager) ? "" : "*",
opt.pattern_list->pattern);
string_list_append(&path_list,
strbuf_detach(&buf, NULL));
string_list_append_nodup(&path_list,
strbuf_detach(&buf, NULL));
}
}
@ -1195,6 +1195,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
if (hit && show_in_pager)
run_pager(&opt, prefix);
clear_pathspec(&pathspec);
string_list_clear(&path_list, 0);
free_grep_patterns(&opt);
object_array_clear(&list);
free_repos();

3
t/t7811-grep-open.sh
View file

@ -3,6 +3,7 @@
test_description='git grep --open-files-in-pager
'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-pager.sh
unset PAGER GIT_PAGER
@ -114,8 +115,8 @@ test_expect_success 'modified file' '
unrelated
EOF
test_when_finished "git reset --hard" &&
echo "enum grep_pat_token" >unrelated &&
test_when_finished "git checkout HEAD unrelated" &&
GIT_PAGER=./less git grep -F -O "enum grep_pat_token" >out &&
test_cmp expect actual &&
test_must_be_empty out