In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
IB\/IPoIB: Avoid restoring OPER_UP after multicast flush<\/p>\n
ipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to
\nprevent multicast joins while ipoib_mcast_dev_flush() is running, and
\nrestores the flag afterwards if it was previously set.<\/p>\n
This restore races with ipoib_ib_dev_down(). If the interface is brought
\ndown while the flush is in progress, ipoib_ib_dev_down() clears
\nIPOIB_FLAG_OPER_UP, but the flush path may set it again after the device
\nhas already gone down.<\/p>\n
Since commit 894021a75291 (“IB\/ipoib: Make the carrier_on_task race
\naware”), ipoib_mcast_carrier_on_task() relies on IPOIB_FLAG_OPER_UP
\nbeing cleared to terminate its rtnl_trylock() retry loop. If the flag is
\nleft set after shutdown, the workqueue retries forever, causing teardown
\nto deadlock when ipoib_ndo_uninit() waits in destroy_workqueue() while
\nholding RTNL.<\/p>\n
Instead of overloading IPOIB_FLAG_OPER_UP to block multicast joins
\nduring a light flush, introduce a dedicated IPOIB_FLAG_MCAST_FLUSH flag.
\nUse it together with IPOIB_FLAG_OPER_UP to determine whether multicast
\njoins are allowed, avoiding the race with device shutdown.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
IB\/IPoIB: Avoid restoring OPER_UP after multicast flush<\/p>\n
ipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to
\npreven<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33416","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33416","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=33416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}