CVE-2023-53848

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> md/raid5-cache: fix a deadlock in r5l_exit_log()<br /> <br /> Commit b13015af94cf ("md/raid5-cache: Clear conf-&gt;log after finishing<br /> work") introduce a new problem:<br /> <br /> // caller hold reconfig_mutex<br /> r5l_exit_log<br /> flush_work(&amp;log-&gt;disable_writeback_work)<br /> r5c_disable_writeback_async<br /> wait_event<br /> /*<br /> * conf-&gt;log is not NULL, and mddev_trylock()<br /> * will fail, wait_event() can never pass.<br /> */<br /> conf-&gt;log = NULL<br /> <br /> Fix this problem by setting &amp;#39;config-&gt;log&amp;#39; to NULL before wake_up() as it<br /> used to be, so that wait_event() from r5c_disable_writeback_async() can<br /> exist. In the meantime, move forward md_unregister_thread() so that<br /> null-ptr-deref this commit fixed can still be fixed.