Vulnerability CVE-2024-27389
Published: 2024-05-01

Description:
In the Linux kernel, the following vulnerability has been resolved:

pstore: inode: Only d_invalidate() is needed

Unloading a modular pstore backend with records in pstorefs would
trigger the dput() double-drop warning:

WARNING: CPU: 0 PID: 2569 at fs/dcache.c:762 dput.part.0+0x3f3/0x410

Using the combo of d_drop()/dput() (as mentioned in
Documentation/filesystems/vfs.rst) isn't the right approach here, and
leads to the reference counting problem seen above. Use d_invalidate()
and update the code to not bother checking for error codes that can
never happen.

---

 References:
https://git.kernel.org/stable/c/db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e
https://git.kernel.org/stable/c/4cdf9006fc095af71da80e9b5f48a32e991b9ed3
https://git.kernel.org/stable/c/cb9e802e49c24eeb3af35e9e8c04d526f35f112a
https://git.kernel.org/stable/c/340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6
https://git.kernel.org/stable/c/a43e0fc5e9134a46515de2f2f8d4100b74e50de3
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