https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Sun, 04 Oct 2026 00:25:16 +0000 https://vulnerability.circl.lu/vuln/cve-2022-49309 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()</p> <p>There is a deadlock in rtw_surveydone_event_callback(), which is shown below:</p> <p>(Thread 1) | (Thread 2) | _set_timer() rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_scan_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...</p> <p>We hold pmlmepriv-&gt;lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv-&gt;lock in position (2) of thread 2. As a result, rtw_surveydone_event_callback() will block forever.</p> <p>This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() in rtw_scan_timeout_handler() to spin_lock_irq(). Otherwise, spin_lock_bh() will also cause deadlock() in timer handler.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()</p> <p>There is a deadlock in rtw_surveydone_event_callback(), which is shown below:</p> <p>(Thread 1) | (Thread 2) | _set_timer() rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_scan_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...</p> <p>We hold pmlmepriv-&gt;lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv-&gt;lock in position (2) of thread 2. As a result, rtw_surveydone_event_callback() will block forever.</p> <p>This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() in rtw_scan_timeout_handler() to spin_lock_irq(). Otherwise, spin_lock_bh() will also cause deadlock() in timer handler.</p> https://vulnerability.circl.lu/vuln/cve-2022-49309