In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio-ap: Fix NULL deref in status_show() during queue probe<\/p>\n
When vfio_ap_mdev_probe_queue() creates the sysfs attribute group,
\nthe queue’s driver data has not yet been set. A concurrent read of
\nthe ‘status’ attribute can therefore call dev_get_drvdata() and
\nget NULL, which is then passed directly to
\nvfio_ap_mdev_for_queue() where q->apqn is unconditionally
\ndereferenced, causing a NULL pointer dereference.<\/p>\n
Fix this by acquiring the update locks before calling
\nsysfs_create_group(). The status_show() function acquires
\nguests_lock before reading the driver data, so any concurrent
\nread will block until after dev_set_drvdata() has been called
\nand the update locks are released.<\/p>\n
As a bonus, the APQN no longer needs to be read from the queue
\nstruct after allocation \u2014 it can be read directly from apdev
\nbefore allocation and stored in a local variable, which is then
\nassigned to q->apqn once the allocation succeeds.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio-ap: Fix NULL deref in status_show() during queue probe<\/p>\n
When vfio_ap_mdev_probe_queue() creates the sysfs attribute group<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24642","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24642","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=24642"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24642"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}