In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
cachefiles: Fix double unlock in nomem_d_alloc error path<\/p>\n
When start_creating() fails and returns -ENOMEM, it has already
\nreleased the parent directory lock in __start_dirop():<\/p>\n
static struct dentry *__start_dirop(…)
\n {
\n …
\n inode_lock_nested(dir, I_MUTEX_PARENT);
\n dentry = lookup_one_qstr_excl(name, parent, lookup_flags);
\n if (IS_ERR(dentry))
\n inode_unlock(dir); <– Lock released on error
\n return dentry;
\n }<\/p>\n
However, the nomem_d_alloc error path in cachefiles_get_directory()
\nunconditionally calls inode_unlock(d_inode(dir)) again, causing a
\ndouble unlock that corrupts the rwsem state.<\/p>\n
This is a leftover from commit 7ab96df840e60 which replaced manual
\nlocking with start_creating() but failed to update the nomem_d_alloc
\npath (while correctly updating mkdir_error and lookup_error paths).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
cachefiles: Fix double unlock in nomem_d_alloc error path<\/p>\n
When start_creating() fails and returns -ENOMEM, it has already
\nreleased<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7007","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7007","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=7007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}