Add string length checking to function COM_StripExtension. This fixes the R_RemapShader buffer overflow exploit that can be found here:

http://milw0rm.com/exploits/1750

code/qcommon/vm.c

@@ -230,7 +230,7 @@ void VM_LoadSymbols( vm_t *vm ) {
 		return;
 	}
 
-	COM_StripExtension( vm->name, name );
+	COM_StripExtension(vm->name, name, sizeof(name));
 	Com_sprintf( symbols, sizeof( symbols ), "vm/%s.map", name );
 	len = FS_ReadFile( symbols, (void **)&mapfile );
 	if ( !mapfile ) {