In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
firmware: arm_scmi: Drop handle on protocol bind failures<\/p>\n
The SCMI bus notifier acquires an SCMI handle when the driver core emits
\nBUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe
\ncallback. The protocol probe path only checks whether sdev->handle is
\nset.<\/p>\n
If device_link_add() fails after the handle has been acquired, the
\nprotocol device can still bind with a valid handle but without the
\ndependency link to the SCMI parent. A concurrent parent unbind can then
\nmiss the child and tear down the SCMI instance while the child still
\nholds a handle into it.<\/p>\n
If the protocol driver probe later fails, for example with
\n-EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather
\nthan BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the
\nhandle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind
\nleaked the SCMI instance users refcount and left sdev->handle set after
\nthe failed probe.<\/p>\n
Make the link helper report failure and drop the acquired handle if the
\nlink cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the
\nsame cleanup path used for unbind so failed probes balance the earlier
\nBUS_NOTIFY_BIND_DRIVER acquisition.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
firmware: arm_scmi: Drop handle on protocol bind failures<\/p>\n
The SCMI bus notifier acquires an SCMI handle when the driver core emits<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25943","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25943","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=25943"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25943"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25943"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}