CVE-2026-64145: wifi: wilc1000: fix dma_buffer leak on bus acquire failure

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

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

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

wifi: wilc1000: fix dma_buffer leak on bus acquire failure

wilc_wlan_firmware_download() allocates dma_buffer with kmalloc() at
the top of the function and uses a 'fail:' label to free it via
kfree(dma_buffer) on error.

All later error paths correctly use 'goto fail' to route through this
cleanup. However, the early failure path after the first acquire_bus()
call uses a bare 'return ret;', which leaks dma_buffer whenever the bus
acquire fails.

Replace the early return with goto fail so the existing cleanup path
runs.

Found via a custom Coccinelle semantic patch hunting for kmalloc'd
locals leaked on early-return error paths in driver firmware-download
code.

The Linux kernel CVE team has assigned CVE-2026-64145 to this issue.


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

	Issue introduced in 6.13 with commit 1241c5650ff7a0236cebb89acca8aade48839fd6 and fixed in 6.18.34 with commit 95c82d498d74c4e587db30021ca1aec90e29b5a5
	Issue introduced in 6.13 with commit 1241c5650ff7a0236cebb89acca8aade48839fd6 and fixed in 7.0.11 with commit 32d7584441b9ecb279a03653b432612546e5efbe
	Issue introduced in 6.13 with commit 1241c5650ff7a0236cebb89acca8aade48839fd6 and fixed in 7.1 with commit dd7b6a8671939708cc4b7a46786d8c11297e8f69

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-2026-64145
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/microchip/wilc1000/wlan.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/95c82d498d74c4e587db30021ca1aec90e29b5a5
	https://git.kernel.org/stable/c/32d7584441b9ecb279a03653b432612546e5efbe
	https://git.kernel.org/stable/c/dd7b6a8671939708cc4b7a46786d8c11297e8f69