Bugzilla – Bug 1226540
VUL-0: CVE-2021-47579: kernel: ovl: fix warning in ovl_create_real()
Last modified: 2024-06-20 10:44:46 UTC
In the Linux kernel, the following vulnerability has been resolved: ovl: fix warning in ovl_create_real() Syzbot triggered the following warning in ovl_workdir_create() -> ovl_create_real(): if (!err && WARN_ON(!newdentry->d_inode)) { The reason is that the cgroup2 filesystem returns from mkdir without instantiating the new dentry. Weird filesystems such as this will be rejected by overlayfs at a later stage during setup, but to prevent such a warning, call ovl_mkdir_real() directly from ovl_workdir_create() and reject this case early. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47579 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47579.mbox https://git.kernel.org/stable/c/445d2dc63e5871d218f21b8f62ab29ac72f2e6b8 https://git.kernel.org/stable/c/f9f300a92297be8250547347fd52216ef0177ae0 https://git.kernel.org/stable/c/6859985a2fbda5d1586bf44538853e1be69e85f7 https://git.kernel.org/stable/c/d2ccdd4e4efab06178608a34d7bfb20a54104c02 https://git.kernel.org/stable/c/1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c https://www.cve.org/CVERecord?id=CVE-2021-47579