CVE-2022-50044

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: qrtr: start MHI channel after endpoit creation<br /> <br /> MHI channel may generates event/interrupt right after enabling.<br /> It may leads to 2 race conditions issues.<br /> <br /> 1)<br /> Such event may be dropped by qcom_mhi_qrtr_dl_callback() at check:<br /> <br /> if (!qdev || mhi_res-&gt;transaction_status)<br /> return;<br /> <br /> Because dev_set_drvdata(&amp;mhi_dev-&gt;dev, qdev) may be not performed at<br /> this moment. In this situation qrtr-ns will be unable to enumerate<br /> services in device.<br /> ---------------------------------------------------------------<br /> <br /> 2)<br /> Such event may come at the moment after dev_set_drvdata() and<br /> before qrtr_endpoint_register(). In this case kernel will panic with<br /> accessing wrong pointer at qcom_mhi_qrtr_dl_callback():<br /> <br /> rc = qrtr_endpoint_post(&amp;qdev-&gt;ep, mhi_res-&gt;buf_addr,<br /> mhi_res-&gt;bytes_xferd);<br /> <br /> Because endpoint is not created yet.<br /> --------------------------------------------------------------<br /> So move mhi_prepare_for_transfer_autoqueue after endpoint creation<br /> to fix it.