linux-cve-announce - CVE-2024-56729: smb: Initialize cfid->tcon before performing network ops

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Message-ID: <2024122924-CVE-2024-56729-8f1c@gregkh>
Date: Sun, 29 Dec 2024 12:29:30 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56729: smb: Initialize cfid->tcon before performing network ops

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

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

smb: Initialize cfid->tcon before performing network ops

Avoid leaking a tcon ref when a lease break races with opening the
cached directory. Processing the leak break might take a reference to
the tcon in cached_dir_lease_break() and then fail to release the ref in
cached_dir_offload_close, since cfid->tcon is still NULL.

The Linux kernel CVE team has assigned CVE-2024-56729 to this issue.


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

	Issue introduced in 6.1 with commit ebe98f1447bbccf8228335c62d86af02a0ed23f7 and fixed in 6.6.64 with commit 625e2357c8fcfae6e66dcc667dc656fe390bab15
	Issue introduced in 6.1 with commit ebe98f1447bbccf8228335c62d86af02a0ed23f7 and fixed in 6.11.11 with commit 4b216c8f9c7d84ef7de33ca60b97e08e03ef3292
	Issue introduced in 6.1 with commit ebe98f1447bbccf8228335c62d86af02a0ed23f7 and fixed in 6.12.2 with commit 1b9ab6b648f89441c8a13cb3fd8ca83ffebc5262
	Issue introduced in 6.1 with commit ebe98f1447bbccf8228335c62d86af02a0ed23f7 and fixed in 6.13-rc1 with commit c353ee4fb119a2582d0e011f66a76a38f5cf984d

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-2024-56729
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:
	fs/smb/client/cached_dir.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/625e2357c8fcfae6e66dcc667dc656fe390bab15
	https://git.kernel.org/stable/c/4b216c8f9c7d84ef7de33ca60b97e08e03ef3292
	https://git.kernel.org/stable/c/1b9ab6b648f89441c8a13cb3fd8ca83ffebc5262
	https://git.kernel.org/stable/c/c353ee4fb119a2582d0e011f66a76a38f5cf984d