In the Linux kernel, the following vulnerability has been resolved:
ppdev: Add an error check in register_device
In registerdevice, the return value of idasimpleget is unchecked, in witch idasimple_get will use an invalid index value.
To address this issue, index should be checked after idasimpleget. When the index value is abnormal, a warning message should be printed, the port should be dropped, and the value should be recorded.