In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
null_blk: free zones array on device power-off<\/p>\n
null_init_zoned_dev() allocates dev->zones when a zoned device is powered
\non, but null_del_dev() never frees it on power-off; dev->zones is only
\nfreed later in null_free_dev(), when the configfs directory is removed. If
\nthe device is powered off and then on again, null_init_zoned_dev()
\nallocates a new array and overwrites the dev->zones pointer, leaking the
\nprevious allocation each power cycle.<\/p>\n
Free dev->zones in null_del_dev() via null_free_zoned_dev() to solve it.
\nAnd calling null_free_zoned_dev() in null_free_dev() is no longer necessary
\nbecause every caller already invokes null_del_dev() first: via
\nnullb_group_drop_item() before nullb_device_release(), in the
\nnull_add_dev() error path of null_create_dev(), and in null_destroy_dev().
\nRemove the redundant call.<\/p>\n
And take &lock around zone_cond_store() in the two store wrappers to
\nserialize dev->zones check-and-deref against its alloc\/free, which already
\nrun under &lock. The reason there was no problem before is that only
\nnullb_device_release() or null_exit() frees the dev->zones, which
\nguarantees that subsequent users won’t access the configfs interface.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
null_blk: free zones array on device power-off<\/p>\n
null_init_zoned_dev() allocates dev->zones when a zoned device is powered
\non, but n<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25596","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25596","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=25596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25596"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}