In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()<\/p>\n
l2cap_chan_close() removes the channel from conn->chan_l, which
\nmust be done under conn->lock. cleanup_listen() runs under the
\nparent sk_lock, so acquiring conn->lock would invert the
\nestablished conn->lock -> chan->lock -> sk_lock order.<\/p>\n
Instead of calling l2cap_chan_close() directly, schedule
\nl2cap_chan_timeout with delay 0 to close the channel
\nasynchronously. The timeout handler already acquires conn->lock
\nand chan->lock in the correct order.<\/p>\n
The timer is only armed when chan->conn is still set: if it is
\nalready NULL, l2cap_conn_del() has already processed this channel
\n(l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb),
\nso there is nothing left to do. If l2cap_conn_del() races in
\nafter the timer is armed, __clear_chan_timer() inside
\nl2cap_chan_del() cancels it; if the timer has already fired, the
\nhandler returns harmlessly because chan->conn was cleared.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()<\/p>\n
l2cap_chan_close() removes the channel from conn->chan_l, w<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12700","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}