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MDEV-7641 Server crash on set global server_audit_incl_users=null.

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plugin_variable_update() can get NULL as a value for a string parameter.
Needs to be checked and handled properly.
This commit is contained in:
Alexey Botchkov
2015-03-19 19:46:08 +04:00
parent c020d362b6
commit 5e20df2ff9
3 changed files with 16 additions and 7 deletions
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19
plugin/server_audit/server_audit.c
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@@ -877,6 +877,7 @@ static struct connection_info *
#define SAFE_STRLEN(s) (s ? strlen(s) : 0)
static char empty_str[1]= { 0 };
static int is_space(char c)
@@ -2156,10 +2157,12 @@ static void update_file_path(MYSQL_THD thd,
struct st_mysql_sys_var *var __attribute__((unused)),
void *var_ptr __attribute__((unused)), const void *save)
{
char *new_name= (*(char **) save) ? *(char **) save : empty_str;
flogger_mutex_lock(&lock_operations);
internal_stop_logging= 1;
error_header();
fprintf(stderr, "Log file name was changed to '%s'.\n", *(const char **) save);
fprintf(stderr, "Log file name was changed to '%s'.\n", new_name);
if (logging)
log_current_query(thd);
@@ -2168,7 +2171,7 @@ static void update_file_path(MYSQL_THD thd,
{
char *sav_path= file_path;
file_path= *(char **) save;
file_path= new_name;
internal_stop_logging= 1;
stop_logging();
if (start_logging())
@@ -2188,7 +2191,7 @@ static void update_file_path(MYSQL_THD thd,
internal_stop_logging= 0;
}
strncpy(path_buffer, *(const char **) save, sizeof(path_buffer));
strncpy(path_buffer, new_name, sizeof(path_buffer));
file_path= path_buffer;
exit_func:
internal_stop_logging= 0;
@@ -2235,9 +2238,10 @@ static void update_incl_users(MYSQL_THD thd,
struct st_mysql_sys_var *var __attribute__((unused)),
void *var_ptr __attribute__((unused)), const void *save)
{
char *new_users= (*(char **) save) ? *(char **) save : empty_str;
flogger_mutex_lock(&lock_operations);
mark_always_logged(thd);
strncpy(incl_user_buffer, *(const char **) save, sizeof(incl_user_buffer));
strncpy(incl_user_buffer, new_users, sizeof(incl_user_buffer));
incl_users= incl_user_buffer;
user_hash_fill(&incl_user_hash, incl_users, &excl_user_hash, 1);
error_header();
@@ -2250,9 +2254,10 @@ static void update_excl_users(MYSQL_THD thd __attribute__((unused)),
struct st_mysql_sys_var *var __attribute__((unused)),
void *var_ptr __attribute__((unused)), const void *save)
{
char *new_users= (*(char **) save) ? *(char **) save : empty_str;
flogger_mutex_lock(&lock_operations);
mark_always_logged(thd);
strncpy(excl_user_buffer, *(const char **) save, sizeof(excl_user_buffer));
strncpy(excl_user_buffer, new_users, sizeof(excl_user_buffer));
excl_users= excl_user_buffer;
user_hash_fill(&excl_user_hash, excl_users, &incl_user_hash, 0);
error_header();
@@ -2377,8 +2382,8 @@ static void update_syslog_ident(MYSQL_THD thd __attribute__((unused)),
struct st_mysql_sys_var *var __attribute__((unused)),
void *var_ptr __attribute__((unused)), const void *save)
{
strncpy(syslog_ident_buffer, *(const char **) save,
sizeof(syslog_ident_buffer));
char *new_ident= (*(char **) save) ? *(char **) save : empty_str;
strncpy(syslog_ident_buffer, new_ident, sizeof(syslog_ident_buffer));
syslog_ident= syslog_ident_buffer;
error_header();
fprintf(stderr, "SYSYLOG ident was changed to '%s'\n", syslog_ident);