CVE-2026-43462: net: spacemit: Fix error handling in emac_tx_mem_map()

CVE-2026-43462: net: spacemit: Fix error handling in emac_tx_mem_map()

[Greg Kroah-Hartman]

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

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

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

net: spacemit: Fix error handling in emac_tx_mem_map()

The DMA mappings were leaked on mapping error. Free them with the
existing emac_free_tx_buf() function.

The Linux kernel CVE team has assigned CVE-2026-43462 to this issue.


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

	Issue introduced in 6.18 with commit bfec6d7f2001c7470c3cd261ae65a3ba8737f226 and fixed in 6.18.19 with commit c34ebd7b24ea70be3c6fdb6936f79f593f37df60
	Issue introduced in 6.18 with commit bfec6d7f2001c7470c3cd261ae65a3ba8737f226 and fixed in 6.19.9 with commit edeaba385318f60ec1b32470da4d5eb800294d16
	Issue introduced in 6.18 with commit bfec6d7f2001c7470c3cd261ae65a3ba8737f226 and fixed in 7.0 with commit 86292155bea578ebab0ca3b65d4d87ecd8a0e9ea

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-2026-43462
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/ethernet/spacemit/k1_emac.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/c34ebd7b24ea70be3c6fdb6936f79f593f37df60
	https://git.kernel.org/stable/c/edeaba385318f60ec1b32470da4d5eb800294d16
	https://git.kernel.org/stable/c/86292155bea578ebab0ca3b65d4d87ecd8a0e9ea