CVE-2026-80949: wifi: brcmfmac: Fix memory leak in brcmf_sdio_read_control()

CVE-2026-80949: wifi: brcmfmac: Fix memory leak in brcmf_sdio_read_control()

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

wifi: brcmfmac: Fix memory leak in brcmf_sdio_read_control()

The memory allocated for buf is not freed in some of the error paths in
brcmf_sdio_read_control(). Fix that by adding vfree() calls.

[arend: rework as suggested by Johannes]

The Linux kernel CVE team has assigned CVE-2026-80949 to this issue.


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

	Issue introduced in 3.8 with commit dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 and fixed in 6.12.109 with commit fdb880a7d575efe8b5c7b5b819b96d9251a3937f
	Issue introduced in 3.8 with commit dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 and fixed in 6.18.50 with commit 261d7c7610b4b2f476382c88a2d1ae0cc5e07add
	Issue introduced in 3.8 with commit dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 and fixed in 7.2.4 with commit ba04715ee672c336272be3ceb43bda9ffc33eb75
	Issue introduced in 3.8 with commit dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 and fixed in 7.3-rc1 with commit 0d10db8e94fcb23a799789aaa696b4d8f937e207

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-2026-80949
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/net/wireless/broadcom/brcm80211/brcmfmac/sdio.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/fdb880a7d575efe8b5c7b5b819b96d9251a3937f
	https://git.kernel.org/stable/c/261d7c7610b4b2f476382c88a2d1ae0cc5e07add
	https://git.kernel.org/stable/c/ba04715ee672c336272be3ceb43bda9ffc33eb75
	https://git.kernel.org/stable/c/0d10db8e94fcb23a799789aaa696b4d8f937e207