CVE-2024-41078

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: qgroup: fix quota root leak after quota disable failure<br /> <br /> If during the quota disable we fail when cleaning the quota tree or when<br /> deleting the root from the root tree, we jump to the &amp;#39;out&amp;#39; label without<br /> ever dropping the reference on the quota root, resulting in a leak of the<br /> root since fs_info-&gt;quota_root is no longer pointing to the root (we have<br /> set it to NULL just before those steps).<br /> <br /> Fix this by always doing a btrfs_put_root() call under the &amp;#39;out&amp;#39; label.<br /> This is a problem that exists since qgroups were first added in 2012 by<br /> commit bed92eae26cc ("Btrfs: qgroup implementation and prototypes"), but<br /> back then we missed a kfree on the quota root and free_extent_buffer()<br /> calls on its root and commit root nodes, since back then roots were not<br /> yet reference counted.