linux-cve-announce - CVE-2024-50152: smb: client: fix possible double free in smb2_set

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Message-ID: <2024110745-CVE-2024-50152-535e@gregkh>
Date: Thu,  7 Nov 2024 10:34:52 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50152: smb: client: fix possible double free in smb2_set_ea()

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

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

smb: client: fix possible double free in smb2_set_ea()

Clang static checker(scan-build) warning：
fs/smb/client/smb2ops.c:1304:2: Attempt to free released memory.
 1304 |         kfree(ea);
      |         ^~~~~~~~~

There is a double free in such case:
'ea is initialized to NULL' -> 'first successful memory allocation for
ea' -> 'something failed, goto sea_exit' -> 'first memory release for ea'
-> 'goto replay_again' -> 'second goto sea_exit before allocate memory
for ea' -> 'second memory release for ea resulted in double free'.

Re-initialie 'ea' to NULL near to the replay_again label, it can fix this
double free problem.

The Linux kernel CVE team has assigned CVE-2024-50152 to this issue.


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

	Issue introduced in 6.6.32 with commit 433042a91f93 and fixed in 6.6.59 with commit b1813c220b76
	Issue introduced in 6.8 with commit 4f1fffa23769 and fixed in 6.11.6 with commit c9f758ecf256
	Issue introduced in 6.8 with commit 4f1fffa23769 and fixed in 6.12-rc4 with commit 19ebc1e6cab3

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-2024-50152
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/smb2ops.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/b1813c220b76f60b1727984794377c4aa849d4c1
	https://git.kernel.org/stable/c/c9f758ecf2562dfdd4adf12c22921b5de8366123
	https://git.kernel.org/stable/c/19ebc1e6cab334a8193398d4152deb76019b5d34