CVE-2022-48985

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: mana: Fix race on per-CQ variable napi work_done<br /> <br /> After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be<br /> cleared, and another CPU can start napi thread and access per-CQ variable,<br /> cq-&gt;work_done. If the other thread (for example, from busy_poll) sets<br /> it to a value &gt;= budget, this thread will continue to run when it should<br /> stop, and cause memory corruption and panic.<br /> <br /> To fix this issue, save the per-CQ work_done variable in a local variable<br /> before napi_complete_done(), so it won&amp;#39;t be corrupted by a possible<br /> concurrent thread after napi_complete_done().<br /> <br /> Also, add a flag bit to advertise to the NIC firmware: the NAPI work_done<br /> variable race is fixed, so the driver is able to reliably support features<br /> like busy_poll.