CVE-2026-45863: i3c: dw: Fix memory leak in dw_i3c_master_i2c_xfers()

CVE-2026-45863: i3c: dw: Fix memory leak in dw_i3c_master_i2c_xfers()

[Greg Kroah-Hartman]

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

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

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

i3c: dw: Fix memory leak in dw_i3c_master_i2c_xfers()

The dw_i3c_master_i2c_xfers() function allocates memory for the xfer
structure using dw_i3c_master_alloc_xfer(). If pm_runtime_resume_and_get()
fails, the function returns without freeing the allocated xfer, resulting
in a memory leak.

Add a dw_i3c_master_free_xfer() call to the error path to ensure the
allocated memory is properly freed.

Compile tested only. Issue found using a prototype static analysis tool
and code review.

The Linux kernel CVE team has assigned CVE-2026-45863 to this issue.


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

	Issue introduced in 6.11 with commit 62fe9d06f5709caa1fa68055873ff279e05ade37 and fixed in 6.12.75 with commit 140a45bd4f6db7d1b30cab967d29689b946c52fa
	Issue introduced in 6.11 with commit 62fe9d06f5709caa1fa68055873ff279e05ade37 and fixed in 6.18.14 with commit 8e71414e252c1cb235911008a98fd47927d3a55c
	Issue introduced in 6.11 with commit 62fe9d06f5709caa1fa68055873ff279e05ade37 and fixed in 6.19.4 with commit a2c41467ef42f69a3958493a0395ba75174710dc
	Issue introduced in 6.11 with commit 62fe9d06f5709caa1fa68055873ff279e05ade37 and fixed in 7.0 with commit 2537089413514caaa9a5fdeeac3a34d45100f747

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-2026-45863
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/i3c/master/dw-i3c-master.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/140a45bd4f6db7d1b30cab967d29689b946c52fa
	https://git.kernel.org/stable/c/8e71414e252c1cb235911008a98fd47927d3a55c
	https://git.kernel.org/stable/c/a2c41467ef42f69a3958493a0395ba75174710dc
	https://git.kernel.org/stable/c/2537089413514caaa9a5fdeeac3a34d45100f747