CVE-2026-68230: media: amlogic-c3: Add validations for ae and awb config

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

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

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

media: amlogic-c3: Add validations for ae and awb config

Avoid invalid memory access if the zones_num is bigger than
zone_weight.

This patch fixes the following smatch errors:
drivers/media/platform/amlogic/c3/isp/c3-isp-params.c:111 c3_isp_params_awb_wt() error: buffer overflow 'cfg->zone_weight' 768 <= u32max
drivers/media/platform/amlogic/c3/isp/c3-isp-params.c:111 c3_isp_params_awb_wt() error: buffer overflow 'cfg->zone_weight' 768 <= u32max
drivers/media/platform/amlogic/c3/isp/c3-isp-params.c:227 c3_isp_params_ae_wt() error: buffer overflow 'cfg->zone_weight' 255 <= u32max
drivers/media/platform/amlogic/c3/isp/c3-isp-params.c:227 c3_isp_params_ae_wt() error: buffer overflow 'cfg->zone_weight' 255 <= u32max

The Linux kernel CVE team has assigned CVE-2026-68230 to this issue.


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

	Issue introduced in 6.16 with commit fb2e135208f364f26b7579c191434d38655e813f and fixed in 6.18.42 with commit 391fe3e36e59f3c6e3d46edfb3a5de51e00cd216
	Issue introduced in 6.16 with commit fb2e135208f364f26b7579c191434d38655e813f and fixed in 7.1.6 with commit 32cbe5474e74817aa8a576b94135cc45e59f5e07
	Issue introduced in 6.16 with commit fb2e135208f364f26b7579c191434d38655e813f and fixed in 7.2-rc1 with commit 9724164f71974a2a44a5e026614fbcc05bab6d91

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-2026-68230
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/media/platform/amlogic/c3/isp/c3-isp-params.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/391fe3e36e59f3c6e3d46edfb3a5de51e00cd216
	https://git.kernel.org/stable/c/32cbe5474e74817aa8a576b94135cc45e59f5e07
	https://git.kernel.org/stable/c/9724164f71974a2a44a5e026614fbcc05bab6d91