CVE-2021-47453

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ice: Avoid crash from unnecessary IDA free<br /> <br /> In the remove path, there is an attempt to free the aux_idx IDA whether<br /> it was allocated or not. This can potentially cause a crash when<br /> unloading the driver on systems that do not initialize support for RDMA.<br /> But, this free cannot be gated by the status bit for RDMA, since it is<br /> allocated if the driver detects support for RDMA at probe time, but the<br /> driver can enter into a state where RDMA is not supported after the IDA<br /> has been allocated at probe time and this would lead to a memory leak.<br /> <br /> Initialize aux_idx to an invalid value and check for a valid value when<br /> unloading to determine if an IDA free is necessary.