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Fix unchecked mallocs/strdups added by recent placeholder-config-vars 

patch.

Thomas Hallgren
This commit is contained in:
Tom Lane 2004-07-05 23:14:14 +00:00
parent 1fcaceeae0
commit ab50ed8f57
1 changed files with 117 additions and 88 deletions
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205
src/backend/utils/misc/guc.c
View File

@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.212 2004/07/01 00:51:24 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.213 2004/07/05 23:14:14 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -1608,7 +1608,7 @@ static struct config_string ConfigureNamesString[] =
gettext_noop("Sets the target for log output."),
gettext_noop("Valid values are combinations of stderr, syslog "
"and eventlog, depending on platform."),
GUC_LIST_INPUT | GUC_REPORT
GUC_LIST_INPUT
},
&log_destination_string,
"stderr", assign_log_destination, NULL
@ -1749,6 +1749,49 @@ static void ReportGUCOption(struct config_generic * record);
static char *_ShowOption(struct config_generic * record);
/*
* Some infrastructure for checking malloc/strdup/realloc calls
*/
static void *
guc_malloc(int elevel, size_t size)
{
void *data;
data = malloc(size);
if (data == NULL)
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return data;
}
static void *
guc_realloc(int elevel, void *old, size_t size)
{
void *data;
data = realloc(old, size);
if (data == NULL)
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return data;
}
static char *
guc_strdup(int elevel, const char *src)
{
char *data;
data = strdup(src);
if (data == NULL)
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return data;
}
/*
* Support for assigning to a field of a string GUC item. Free the prior
* value if it's not referenced anywhere else in the item (including stacked
@ -1860,11 +1903,7 @@ build_guc_variables(void)
size_vars = num_vars + num_vars / 4;
guc_vars = (struct config_generic **)
malloc(size_vars * sizeof(struct config_generic *));
if (!guc_vars)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
guc_malloc(FATAL, size_vars * sizeof(struct config_generic *));
num_vars = 0;
@ -1923,28 +1962,30 @@ is_custom_class(const char *name, int dotPos)
* Add a new GUC variable to the list of known variables. The
* list is expanded if needed.
*/
static void
add_guc_variable(struct config_generic *var)
static bool
add_guc_variable(struct config_generic *var, int elevel)
{
if(num_guc_variables + 1 >= size_guc_variables)
{
/* Increase the vector with 20%
/* Increase the vector by 25%
*/
int size_vars = size_guc_variables + size_guc_variables / 4;
struct config_generic** guc_vars;
if(size_vars == 0)
size_vars = 100;
guc_vars = (struct config_generic**)
malloc(size_vars * sizeof(struct config_generic*));
if (guc_variables != NULL)
{
memcpy(guc_vars, guc_variables,
num_guc_variables * sizeof(struct config_generic*));
free(guc_variables);
size_vars = 100;
guc_vars = (struct config_generic**)
guc_malloc(elevel, size_vars * sizeof(struct config_generic*));
}
else
{
guc_vars = (struct config_generic**)
guc_realloc(elevel, guc_variables, size_vars * sizeof(struct config_generic*));
}
if(guc_vars == NULL)
return false; /* out of memory */
guc_variables = guc_vars;
size_guc_variables = size_vars;
@ -1952,22 +1993,34 @@ add_guc_variable(struct config_generic *var)
guc_variables[num_guc_variables++] = var;
qsort((void*) guc_variables, num_guc_variables,
sizeof(struct config_generic*), guc_var_compare);
return true;
}
/*
* Create and add a placeholder variable. Its presumed to belong
* Create and add a placeholder variable. It's presumed to belong
* to a valid custom variable class at this point.
*/
static struct config_string*
add_placeholder_variable(const char *name)
add_placeholder_variable(const char *name, int elevel)
{
size_t sz = sizeof(struct config_string) + sizeof(char*);
struct config_string* var = (struct config_string*)malloc(sz);
struct config_generic* gen = &var->gen;
struct config_string* var;
struct config_generic* gen;
var = (struct config_string*)guc_malloc(elevel, sz);
if(var == NULL)
return NULL;
gen = &var->gen;
memset(var, 0, sz);
gen->name = strdup(name);
gen->name = guc_strdup(elevel, name);
if(gen->name == NULL)
{
free(var);
return NULL;
}
gen->context = PGC_USERSET;
gen->group = CUSTOM_OPTIONS;
gen->short_desc = "GUC placeholder variable";
@ -1978,7 +2031,14 @@ add_placeholder_variable(const char *name)
* no 'static' place to point to.
*/
var->variable = (char**)(var + 1);
add_guc_variable((struct config_generic*)var);
if(!add_guc_variable((struct config_generic*) var, elevel))
{
free((void *) gen->name);
free(var);
return NULL;
}
return var;
}
@ -1987,7 +2047,7 @@ add_placeholder_variable(const char *name)
* else return NULL.
*/
static struct config_generic *
find_option(const char *name)
find_option(const char *name, int elevel)
{
const char *dot;
const char **key = &name;
@ -2016,7 +2076,7 @@ find_option(const char *name)
for (i = 0; map_old_guc_names[i] != NULL; i += 2)
{
if (guc_name_compare(name, map_old_guc_names[i]) == 0)
return find_option(map_old_guc_names[i+1]);
return find_option(map_old_guc_names[i+1], elevel);
}
/*
@ -2026,7 +2086,7 @@ find_option(const char *name)
dot = strchr(name, GUC_QUALIFIER_SEPARATOR);
if(dot != NULL && is_custom_class(name, dot - name))
/* Add a placeholder variable for this name */
return (struct config_generic*)add_placeholder_variable(name);
return (struct config_generic*)add_placeholder_variable(name, elevel);
/* Unknown name */
return NULL;
@ -2172,11 +2232,7 @@ InitializeGUCOptions(void)
break;
}
str = strdup(conf->boot_val);
if (str == NULL)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
str = guc_strdup(FATAL, conf->boot_val);
conf->reset_val = str;
if (conf->assign_hook)
@ -2912,7 +2968,7 @@ set_config_option(const char *name, const char *value,
else
elevel = ERROR;
record = find_option(name);
record = find_option(name, elevel);
if (record == NULL)
{
ereport(elevel,
@ -3368,14 +3424,9 @@ set_config_option(const char *name, const char *value,
if (value)
{
newval = strdup(value);
newval = guc_strdup(elevel, value);
if (newval == NULL)
{
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return false;
}
if (record->context == PGC_USERLIMIT)
{
@ -3426,14 +3477,9 @@ set_config_option(const char *name, const char *value,
* make this case work the same as the normal
* assignment case.
*/
newval = strdup(conf->reset_val);
newval = guc_strdup(elevel, conf->reset_val);
if (newval == NULL)
{
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return false;
}
source = conf->gen.reset_source;
}
else
@ -3571,7 +3617,7 @@ GetConfigOption(const char *name)
struct config_generic *record;
static char buffer[256];
record = find_option(name);
record = find_option(name, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
@ -3607,7 +3653,7 @@ GetConfigOptionResetString(const char *name)
struct config_generic *record;
static char buffer[256];
record = find_option(name);
record = find_option(name, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
@ -3663,7 +3709,7 @@ flatten_set_variable_args(const char *name, List *args)
return NULL;
/* Else get flags for the variable */
record = find_option(name);
record = find_option(name, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
@ -3834,7 +3880,7 @@ define_custom_variable(struct config_generic* variable)
if(res == NULL)
{
add_guc_variable(variable);
add_guc_variable(variable, ERROR);
return;
}
@ -3883,7 +3929,7 @@ static void init_custom_variable(
GucContext context,
enum config_type type)
{
gen->name = strdup(name);
gen->name = guc_strdup(ERROR, name);
gen->context = context;
gen->group = CUSTOM_OPTIONS;
gen->short_desc = short_desc;
@ -3901,7 +3947,7 @@ void DefineCustomBoolVariable(
GucShowHook show_hook)
{
size_t sz = sizeof(struct config_bool);
struct config_bool* var = (struct config_bool*)malloc(sz);
struct config_bool* var = (struct config_bool*)guc_malloc(ERROR, sz);
memset(var, 0, sz);
init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_BOOL);
@ -3923,7 +3969,7 @@ void DefineCustomIntVariable(
GucShowHook show_hook)
{
size_t sz = sizeof(struct config_int);
struct config_int* var = (struct config_int*)malloc(sz);
struct config_int* var = (struct config_int*)guc_malloc(ERROR, sz);
memset(var, 0, sz);
init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_INT);
@ -3945,7 +3991,7 @@ void DefineCustomRealVariable(
GucShowHook show_hook)
{
size_t sz = sizeof(struct config_real);
struct config_real* var = (struct config_real*)malloc(sz);
struct config_real* var = (struct config_real*)guc_malloc(ERROR, sz);
memset(var, 0, sz);
init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_REAL);
@ -3967,7 +4013,7 @@ void DefineCustomStringVariable(
GucShowHook show_hook)
{
size_t sz = sizeof(struct config_string);
struct config_string* var = (struct config_string*)malloc(sz);
struct config_string* var = (struct config_string*)guc_malloc(ERROR, sz);
memset(var, 0, sz);
init_custom_variable(&var->gen, name, short_desc, long_desc, context, PGC_STRING);
@ -4139,7 +4185,7 @@ GetConfigOptionByName(const char *name, const char **varname)
{
struct config_generic *record;
record = find_option(name);
record = find_option(name, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
@ -4506,16 +4552,18 @@ write_nondefault_variables(GucContext context)
/*
* Open file
*/
new_filename = malloc(strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) +
new_filename = guc_malloc(elevel, strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) +
strlen(".new") + 2);
filename = malloc(strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) + 2);
if (new_filename == NULL || filename == NULL)
if(new_filename == NULL)
return;
filename = guc_malloc(elevel, strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) + 2);
if (filename == NULL)
{
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
free(new_filename);
return;
}
sprintf(new_filename, "%s/" CONFIG_EXEC_PARAMS ".new", DataDir);
sprintf(filename, "%s/" CONFIG_EXEC_PARAMS, DataDir);
@ -4627,9 +4675,9 @@ read_string_with_null(FILE *fp)
elog(FATAL, "invalid format of exec config params file");
}
if (i == 0)
str = malloc(maxlen);
str = guc_malloc(FATAL, maxlen);
else if (i == maxlen)
str = realloc(str, maxlen *= 2);
str = guc_realloc(FATAL, str, maxlen *= 2);
str[i++] = ch;
} while (ch != 0);
@ -4655,14 +4703,7 @@ read_nondefault_variables(void)
/*
* Open file
*/
filename = malloc(strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) + 2);
if (filename == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return;
}
filename = guc_malloc(FATAL, strlen(DataDir) + strlen(CONFIG_EXEC_PARAMS) + 2);
sprintf(filename, "%s/" CONFIG_EXEC_PARAMS, DataDir);
fp = AllocateFile(filename, "r");
@ -4684,7 +4725,7 @@ read_nondefault_variables(void)
if ((varname = read_string_with_null(fp)) == NULL)
break;
if ((record = find_option(varname)) == NULL)
if ((record = find_option(varname, FATAL)) == NULL)
elog(FATAL, "failed to locate variable %s in exec config params file",varname);
if ((varvalue = read_string_with_null(fp)) == NULL)
elog(FATAL, "invalid format of exec config params file");
@ -4725,28 +4766,16 @@ ParseLongOption(const char *string, char **name, char **value)
if (string[equal_pos] == '=')
{
*name = malloc(equal_pos + 1);
if (!*name)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
*name = guc_malloc(FATAL, equal_pos + 1);
strncpy(*name, string, equal_pos);
(*name)[equal_pos] = '\0';
*value = strdup(&string[equal_pos + 1]);
if (!*value)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
*value = guc_strdup(FATAL, &string[equal_pos + 1]);
}
else
{
/* no equal sign in string */
*name = strdup(string);
if (!*name)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
*name = guc_strdup(FATAL, string);
*value = NULL;
}