Commit 8812f562 authored by Nick Mathewson's avatar Nick Mathewson 🐻
Browse files

Fix a memory leak in --dump-config

When freeing a configuration object from confparse.c in
dump_config(), we need to call the appropriate higher-level free
function (like or_options_free()) and not just config_free().

This only happens with options (since they're the one where
options_validate allocates extra stuff) and only when running
--dump-config with something other than minimal (since
OPTIONS_DUMP_MINIMAL doesn't hit this code).

Fixes bug 27893; bugfix on 0.3.2.1-alpha.
parent de0b07c6
o Minor bugfixes (memory leaks):
- Fix a small memory leak when calling Tor with --dump-config.
Fixes bug 27893; bugfix on 0.3.2.1-alpha.
......@@ -824,6 +824,7 @@ static void config_maybe_load_geoip_files_(const or_options_t *options,
static int options_validate_cb(void *old_options, void *options,
void *default_options,
int from_setconf, char **msg);
static void options_free_cb(void *options);
static void cleanup_protocol_warning_severity_level(void);
static void set_protocol_warning_severity_level(int warning_severity);
......@@ -839,6 +840,7 @@ STATIC config_format_t options_format = {
option_deprecation_notes_,
option_vars_,
options_validate_cb,
options_free_cb,
NULL
};
......@@ -3149,6 +3151,13 @@ options_validate_cb(void *old_options, void *options, void *default_options,
return rv;
}
/** Callback to free an or_options_t */
static void
options_free_cb(void *options)
{
or_options_free_(options);
}
#define REJECT(arg) \
STMT_BEGIN *msg = tor_strdup(arg); return -1; STMT_END
#if defined(__GNUC__) && __GNUC__ <= 3
......
......@@ -1009,8 +1009,9 @@ config_dump(const config_format_t *fmt, const void *default_options,
result = smartlist_join_strings(elements, "", 0, NULL);
SMARTLIST_FOREACH(elements, char *, cp, tor_free(cp));
smartlist_free(elements);
if (defaults_tmp)
config_free(fmt, defaults_tmp);
if (defaults_tmp) {
fmt->free_fn(defaults_tmp);
}
return result;
}
......
......@@ -155,6 +155,9 @@ typedef struct config_var_t {
* of arguments. */
typedef int (*validate_fn_t)(void*,void*,void*,int,char**);
/** Callback to free a configuration object. */
typedef void (*free_cfg_fn_t)(void*);
/** Information on the keys, value types, key-to-struct-member mappings,
* variable descriptions, validation functions, and abbreviations for a
* configuration or storage format. */
......@@ -169,6 +172,7 @@ typedef struct config_format_t {
config_var_t *vars; /**< List of variables we recognize, their default
* values, and where we stick them in the structure. */
validate_fn_t validate_fn; /**< Function to validate config. */
free_cfg_fn_t free_fn; /**< Function to free the configuration. */
/** If present, extra is a LINELIST variable for unrecognized
* lines. Otherwise, unrecognized lines are an error. */
config_var_t *extra;
......
......@@ -143,6 +143,8 @@ static int or_state_validate_cb(void *old_options, void *options,
void *default_options,
int from_setconf, char **msg);
static void or_state_free_cb(void *state);
/** Magic value for or_state_t. */
#define OR_STATE_MAGIC 0x57A73f57
......@@ -162,6 +164,7 @@ static const config_format_t state_format = {
NULL,
state_vars_,
or_state_validate_cb,
or_state_free_cb,
&state_extra_var,
};
......@@ -259,6 +262,12 @@ or_state_validate_cb(void *old_state, void *state, void *default_state,
return or_state_validate(state, msg);
}
static void
or_state_free_cb(void *state)
{
or_state_free_(state);
}
/** Return 0 if every setting in <b>state</b> is reasonable, and a
* permissible transition from <b>old_state</b>. Else warn and return -1.
* Should have no side effects, except for normalizing the contents of
......
......@@ -63,6 +63,7 @@ DUMMY_TYPECHECK_INSTANCE(sr_disk_state_t);
static int
disk_state_validate_cb(void *old_state, void *state, void *default_state,
int from_setconf, char **msg);
static void disk_state_free_cb(void *);
/* Array of variables that are saved to disk as a persistent state. */
static config_var_t state_vars[] = {
......@@ -96,6 +97,7 @@ static const config_format_t state_format = {
NULL,
state_vars,
disk_state_validate_cb,
disk_state_free_cb,
&state_extra_var,
};
......@@ -342,6 +344,12 @@ disk_state_validate_cb(void *old_state, void *state, void *default_state,
return 0;
}
static void
disk_state_free_cb(void *state)
{
disk_state_free_(state);
}
/* Parse the Commit line(s) in the disk state and translate them to the
* the memory state. Return 0 on success else -1 on error. */
static int
......
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