Subject: CVE-2024-36947: qibfs: fix dentry leak

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

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

qibfs: fix dentry leak

simple_recursive_removal() drops the pinning references to all positives
in subtree.  For the cases when its argument has been kept alive by
the pinning alone that's exactly the right thing to do, but here
the argument comes from dcache lookup, that needs to be balanced by
explicit dput().

Fucked-up-by: Al Viro <[email-masked]>

The Linux kernel CVE team has assigned CVE-2024-36947 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 5.13 with commit e41d23781859 and fixed in 5.15.159 with commit 24dd9b08df71
	Issue introduced in 5.13 with commit e41d23781859 and fixed in 6.1.91 with commit bd8f78c71def
	Issue introduced in 5.13 with commit e41d23781859 and fixed in 6.6.31 with commit db71ca93259d
	Issue introduced in 5.13 with commit e41d23781859 and fixed in 6.8.10 with commit 02ee394a5d89
	Issue introduced in 5.13 with commit e41d23781859 and fixed in 6.9 with commit aa23317d0268

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-36947
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/infiniband/hw/qib/qib_fs.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/24dd9b08df718f20ccf2dd1519909fefd8c233ee
	https://git.kernel.org/stable/c/bd8f78c71defbcb7a9ed331e7f287507df972b00
	https://git.kernel.org/stable/c/db71ca93259dd1078bcfea3afafde2143cfc2da7
	https://git.kernel.org/stable/c/02ee394a5d899d9bd2f0759382e9481cab6166f8
	https://git.kernel.org/stable/c/aa23317d0268b309bb3f0801ddd0d61813ff5afb