CVE-2021-46969

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bus: mhi: core: Fix invalid error returning in mhi_queue<br /> <br /> mhi_queue returns an error when the doorbell is not accessible in<br /> the current state. This can happen when the device is in non M0<br /> state, like M3, and needs to be waken-up prior ringing the DB. This<br /> case is managed earlier by triggering an asynchronous M3 exit via<br /> controller resume/suspend callbacks, that in turn will cause M0<br /> transition and DB update.<br /> <br /> So, since it&amp;#39;s not an error but just delaying of doorbell update, there<br /> is no reason to return an error.<br /> <br /> This also fixes a use after free error for skb case, indeed a caller<br /> queuing skb will try to free the skb if the queueing fails, but in<br /> that case queueing has been done.