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Fix buffer overflow when setting NETVAR string console variable and ensure servername is within MAXSERVERNAME

See merge request STJr/SRB2!2445
This commit is contained in:
sphere 2024-06-05 12:23:25 +00:00
commit d2cde25177
2 changed files with 13 additions and 2 deletions
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2
src/command.c
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@ -1992,7 +1992,7 @@ static void CV_SetCVar(consvar_t *var, const char *value, boolean stealth)
if (var->flags & CV_NETVAR)
{
// send the value of the variable
UINT8 buf[128];
UINT8 buf[512];
UINT8 *p = buf;
// Loading from a config in a netgame? Set revert value.

13
src/netcode/mserv.c
View file

@ -50,6 +50,8 @@ static void Command_Listserv_f(void);
#endif/*MASTERSERVER*/
static boolean ServerName_CanChange (const char*);
static void Update_parameters (void);
static void MasterServer_OnChange(void);
@ -61,7 +63,7 @@ static CV_PossibleValue_t masterserver_update_rate_cons_t[] = {
};
consvar_t cv_masterserver = CVAR_INIT ("masterserver", "https://ds.ms.srb2.org/MS/0", CV_SAVE|CV_CALL, NULL, MasterServer_OnChange);
consvar_t cv_servername = CVAR_INIT ("servername", "SRB2 server", CV_SAVE|CV_NETVAR|CV_CALL|CV_NOINIT|CV_ALLOWLUA, NULL, Update_parameters);
consvar_t cv_servername = CVAR_INIT_WITH_CALLBACKS ("servername", "SRB2 server", CV_SAVE|CV_NETVAR|CV_CALL|CV_NOINIT|CV_ALLOWLUA, NULL, Update_parameters, ServerName_CanChange);
consvar_t cv_masterserver_update_rate = CVAR_INIT ("masterserver_update_rate", "15", CV_SAVE|CV_CALL|CV_NOINIT, masterserver_update_rate_cons_t, Update_parameters);
@ -497,6 +499,15 @@ Set_api (const char *api)
#endif/*MASTERSERVER*/
static boolean ServerName_CanChange(const char* newvalue)
{
if (strlen(newvalue) < MAXSERVERNAME)
return true;
CONS_Alert(CONS_NOTICE, "The server name must be shorter than %d characters\n", MAXSERVERNAME);
return false;
}
static void
Update_parameters (void)
{