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From: Artem Dinaburg <artem@trailofbits.com>
To: stable@vger.kernel.org
Cc: Artem Dinaburg <artem@trailofbits.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sasha Levin <sashal@kernel.org>,
	Suraj Kandpal <suraj.kandpal@intel.com>,
	Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org,
	Tvrtko Ursulin <tursulin@ursulin.net>,
	Simona Vetter <simona@ffwll.ch>,
	intel-xe@lists.freedesktop.org
Subject: [PATCH 6.1.y 0/2] drm/i915/hdcp: guard both capability checks
Date: Fri,  2 Oct 2026 15:40:25 -0400	[thread overview]
Message-ID: <20261002194030.20489-1-artem@trailofbits.com> (raw)

Hi Greg, Sasha, and i915 maintainers,

Patch 1 alone is not enough on 6.1.y: intel_hdcp_info() calls
intel_hdcp_capable() and then intel_hdcp2_capable(), so the debugfs NULL
dereference moves to the second call. Patch 2 is the companion fix that
path needs, a backport of upstream commit d34f4f058edf ("drm/i915/hdcp:
Add encoder check in hdcp2_get_capability") with the guard in the common
intel_hdcp2_capable() helper, where 6.1.y still does the lookup. This
mirrors the 2-patch series picked up for 6.6.y, and both fixes are
already present in 6.12.y, 6.18.y, and 7.2.y. Could you please queue both
patches for 6.1.y?

AI assistance: An LLM helped adapt and validate both patches; I reviewed
the resulting code and validation evidence.

Thanks,
Artem Dinaburg

Series:
  1. drm/i915/hdcp: Add encoder check in intel_hdcp_get_capability
  2. drm/i915/hdcp: Add encoder check in hdcp2_get_capability

             reply	other threads:[~2026-10-02 19:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-02 19:40 Artem Dinaburg [this message]
2026-10-02 19:40 ` [PATCH 6.1.y 1/2] drm/i915/hdcp: Add encoder check in intel_hdcp_get_capability Artem Dinaburg
2026-10-02 19:40 ` [PATCH 6.1.y 2/2] drm/i915/hdcp: Add encoder check in hdcp2_get_capability Artem Dinaburg

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