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BusDesktopFile: Refactor logic to free the parser contents

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Now that we have _DBUS_STRING_INIT_INVALID, we can initialize
parser.data to a value that is safe for _dbus_string_free(), which
means we can put all the cleanup through a single code path that
definitely frees everything.

(This is just refactoring, not a correctness fix.)

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2018-11-16 17:30:47 +00:00
parent e1ad4e202d
commit 3987f5a4bd
2 changed files with 40 additions and 44 deletions
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79
bus/desktop-file.c
View file

@ -66,6 +66,12 @@ typedef struct
} BusDesktopFileParser;
#define BUS_DESKTOP_FILE_PARSER_INIT \
{ \
_DBUS_STRING_INIT_INVALID, \
NULL, 0, 0, 0, 0 \
}
#define VALID_KEY_CHAR 1
#define VALID_LOCALE_CHAR 2
static unsigned char valid[256] = {
@ -93,10 +99,9 @@ static void report_error (BusDesktopFileParser *parser,
DBusError *error);
static void
parser_free (BusDesktopFileParser *parser)
parser_clear (BusDesktopFileParser *parser)
{
bus_desktop_file_free (parser->desktop_file);
bus_clear_desktop_file (&parser->desktop_file);
_dbus_string_free (&parser->data);
}
@ -418,13 +423,11 @@ parse_section_start (BusDesktopFileParser *parser, DBusError *error)
_dbus_string_get_byte (&parser->data, line_end - 1) != ']')
{
report_error (parser, "Invalid syntax for section header", BUS_DESKTOP_PARSE_ERROR_INVALID_SYNTAX, error);
parser_free (parser);
return FALSE;
}
if (!_dbus_string_init (&section_name))
{
parser_free (parser);
BUS_SET_OOM (error);
return FALSE;
}
@ -433,7 +436,6 @@ parse_section_start (BusDesktopFileParser *parser, DBusError *error)
line_end - parser->pos - 2,
&section_name, 0))
{
parser_free (parser);
_dbus_string_free (&section_name);
BUS_SET_OOM (error);
return FALSE;
@ -442,7 +444,6 @@ parse_section_start (BusDesktopFileParser *parser, DBusError *error)
if (!is_valid_section_name (&section_name))
{
report_error (parser, "Invalid characters in section name", BUS_DESKTOP_PARSE_ERROR_INVALID_CHARS, error);
parser_free (parser);
_dbus_string_free (&section_name);
return FALSE;
}
@ -450,7 +451,6 @@ parse_section_start (BusDesktopFileParser *parser, DBusError *error)
if (open_section (parser, _dbus_string_get_const_data (&section_name)) == NULL)
{
_dbus_string_free (&section_name);
parser_free (parser);
BUS_SET_OOM (error);
return FALSE;
}
@ -493,7 +493,6 @@ parse_key_value (BusDesktopFileParser *parser, DBusError *error)
if (key_start == key_end)
{
report_error (parser, "Empty key name", BUS_DESKTOP_PARSE_ERROR_INVALID_SYNTAX, error);
parser_free (parser);
return FALSE;
}
@ -517,14 +516,12 @@ parse_key_value (BusDesktopFileParser *parser, DBusError *error)
if (p < line_end && _dbus_string_get_byte (&parser->data, p) != '=')
{
report_error (parser, "Invalid characters in key name", BUS_DESKTOP_PARSE_ERROR_INVALID_CHARS, error);
parser_free (parser);
return FALSE;
}
if (p == line_end)
{
report_error (parser, "No '=' in key/value pair", BUS_DESKTOP_PARSE_ERROR_INVALID_SYNTAX, error);
parser_free (parser);
return FALSE;
}
@ -540,7 +537,6 @@ parse_key_value (BusDesktopFileParser *parser, DBusError *error)
value = unescape_string (parser, &parser->data, value_start, line_end, error);
if (value == NULL)
{
parser_free (parser);
return FALSE;
}
@ -548,7 +544,6 @@ parse_key_value (BusDesktopFileParser *parser, DBusError *error)
if (line == NULL)
{
dbus_free (value);
parser_free (parser);
BUS_SET_OOM (error);
return FALSE;
}
@ -556,7 +551,6 @@ parse_key_value (BusDesktopFileParser *parser, DBusError *error)
if (!_dbus_string_init (&key))
{
dbus_free (value);
parser_free (parser);
BUS_SET_OOM (error);
return FALSE;
}
@ -566,7 +560,6 @@ parse_key_value (BusDesktopFileParser *parser, DBusError *error)
{
_dbus_string_free (&key);
dbus_free (value);
parser_free (parser);
BUS_SET_OOM (error);
return FALSE;
}
@ -575,7 +568,6 @@ parse_key_value (BusDesktopFileParser *parser, DBusError *error)
{
_dbus_string_free (&key);
dbus_free (value);
parser_free (parser);
BUS_SET_OOM (error);
return FALSE;
}
@ -620,9 +612,9 @@ BusDesktopFile*
bus_desktop_file_load (DBusString *filename,
DBusError *error)
{
DBusString str;
BusDesktopFileParser parser;
BusDesktopFileParser parser = BUS_DESKTOP_FILE_PARSER_INIT;
DBusStat sb;
BusDesktopFile *result = NULL;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
@ -630,44 +622,39 @@ bus_desktop_file_load (DBusString *filename,
* that we do something silly, we still handle doing it below.
*/
if (!_dbus_stat (filename, &sb, error))
return NULL;
goto out;
if (sb.size > _DBUS_ONE_KILOBYTE * 128)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Desktop file size (%ld bytes) is too large", (long) sb.size);
return NULL;
goto out;
}
if (!_dbus_string_init (&str))
if (!_dbus_string_init (&parser.data))
{
BUS_SET_OOM (error);
return NULL;
}
if (!_dbus_file_get_contents (&str, filename, error))
{
_dbus_string_free (&str);
return NULL;
goto out;
}
if (!_dbus_string_validate_utf8 (&str, 0, _dbus_string_get_length (&str)))
if (!_dbus_file_get_contents (&parser.data, filename, error))
goto out;
if (!_dbus_string_validate_utf8 (&parser.data, 0,
_dbus_string_get_length (&parser.data)))
{
_dbus_string_free (&str);
dbus_set_error (error, DBUS_ERROR_FAILED,
"invalid UTF-8");
return NULL;
goto out;
}
parser.desktop_file = dbus_new0 (BusDesktopFile, 1);
if (parser.desktop_file == NULL)
{
_dbus_string_free (&str);
BUS_SET_OOM (error);
return NULL;
goto out;
}
parser.data = str;
parser.line_num = 1;
parser.pos = 0;
parser.len = _dbus_string_get_length (&parser.data);
@ -678,9 +665,7 @@ bus_desktop_file_load (DBusString *filename,
if (_dbus_string_get_byte (&parser.data, parser.pos) == '[')
{
if (!parse_section_start (&parser, error))
{
return NULL;
}
goto out;
}
else if (is_blank_line (&parser) ||
_dbus_string_get_byte (&parser.data, parser.pos) == '#')
@ -689,21 +674,27 @@ bus_desktop_file_load (DBusString *filename,
{
dbus_set_error(error, DBUS_ERROR_FAILED,
"invalid service file: key=value before [Section]");
parser_free (&parser);
return NULL;
goto out;
}
else
{
if (!parse_key_value (&parser, error))
{
return NULL;
}
goto out;
}
}
_dbus_string_free (&parser.data);
/* Transfer ownership on success */
result = parser.desktop_file;
parser.desktop_file = NULL;
return parser.desktop_file;
out:
if (result != NULL)
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
else
_DBUS_ASSERT_ERROR_IS_SET (error);
parser_clear (&parser);
return result;
}
static BusDesktopFileSection *

5
bus/desktop-file.h
View file

@ -53,5 +53,10 @@ dbus_bool_t bus_desktop_file_get_string (BusDesktopFile *desktop_file,
char **val,
DBusError *error);
static inline void
bus_clear_desktop_file (BusDesktopFile **desktop_p)
{
_dbus_clear_pointer_impl (BusDesktopFile, desktop_p, bus_desktop_file_free);
}
#endif /* BUS_DESKTOP_FILE_H */