In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
rapidio: mport_cdev: fix use-after-free in dma_req_free()<\/p>\n
dma_req_free() acquires buf_mutex through req->map, drops the mapping
\nreference with kref_put(), and then dereferences req->map again to unlock
\nthe mutex.<\/p>\n
If kref_put() drops the last reference, mport_release_mapping() frees the
\nmapping, and the subsequent mutex_unlock() dereferences a freed object.
\nThis is a use-after-free.<\/p>\n
Fix this by caching map and md before kref_put(), clearing req->map while
\nholding buf_mutex, and using the cached md for mutex unlocking.<\/p>\n
The bug is reachable from userspace via the RapidIO mport character device
\ninterface.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
rapidio: mport_cdev: fix use-after-free in dma_req_free()<\/p>\n
dma_req_free() acquires buf_mutex through req->map, drops the mapping
\nre<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21664","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21664","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=21664"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21664"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}