In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: guard nfsd_serv deref in nfsd_file_net_dispose<\/p>\n
nfsd_file_net_dispose() is the consumer side of l->freeme: the nfsd
\nservice thread loop calls it to drain entries that the filecache
\ngarbage collector and shrinker append via
\nnfsd_file_dispose_list_delayed(). During per-net teardown,
\nnn->nfsd_serv is cleared before the filecache laundrette is shut
\ndown, so the service thread can still run a dispose pass that finds
\nmore than eight entries on l->freeme and dereferences a NULL
\nsvc_serv:<\/p>\n
nfsd service thread loop
\n nfsd_file_net_dispose(nn)
\n if (!list_empty(&l->freeme)) {
\n …
\n svc_wake_up(nn->nfsd_serv); \/* nn->nfsd_serv == NULL *\/
\n }<\/p>\n
The sibling helper nfsd_file_dispose_list_delayed() already documents
\nthis ordering and caches nn->nfsd_serv into a local before testing it
\nfor NULL. nfsd_file_net_dispose() was introduced with the same raw
\nsvc_wake_up(nn->nfsd_serv) call and never picked up the guard.<\/p>\n
Fix by loading nn->nfsd_serv into a local svc_serv pointer and only
\ncalling svc_wake_up() when it is non-NULL, matching the pattern in
\nnfsd_file_dispose_list_delayed().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: guard nfsd_serv deref in nfsd_file_net_dispose<\/p>\n
nfsd_file_net_dispose() is the consumer side of l->freeme: the nfsd
\nservice t<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28476","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28476","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=28476"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28476"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}