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Tue, 15 Sep 2026 00:47:26 -0700 (PDT) Received: from localhost.localdomain ([78.40.184.2]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b8a0469a8esm3090013e87.50.2026.09.15.00.47.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2026 00:47:25 -0700 (PDT) From: Roman Demidov To: stable@vger.kernel.org, Greg Kroah-Hartman Cc: Roman Demidov , Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , Xinhui Pan , David Airlie , Simona Vetter , Sasha Levin , Wayne Lin , =?UTF-8?q?Timur=20Krist=C3=B3f?= , Fangzhi Zuo , Mario Limonciello , Srinivasan Shanmugam , Ivan Lipski , Melissa Wen , Alex Hung , "Mario Limonciello (AMD)" , Thomas Zimmermann , Sunil Khatri , Andrey Grodzovsky , Bhawanpreet Lakha , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, WenTao Liang , George Zhang Subject: [PATCH 5.10/5.15/6.1 v2] drm/amd/display: set new_stream to NULL after release Date: Tue, 15 Sep 2026 10:46:09 +0300 Message-ID: <20260915074611.9133-1-roman.demidov.nn@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: WenTao Liang commit 9fa26b9eed6195bf840f39ac183b9a6237548755 upstream. In dm_update_crtc_state(), the skip_modeset path releases new_stream via dc_stream_release() but does not set the pointer to NULL. If a later error (e.g., color management failure) triggers the fail label, the error path calls dc_stream_release() again on the same dangling pointer, causing a double release and potential use-after-free. Fix this by setting new_stream to NULL after the initial release. Fixes: 9b690ef3c704 ("drm/amd/display: Avoid full modeset when not required= ") Signed-off-by: WenTao Liang Reviewed-by: George Zhang Signed-off-by: Alex Deucher Signed-off-by: Roman Demidov --- Backport fix for CVE-2026-68236 v2: Include version 5.15 in the patch, as Sasha Levin suggested. drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gp= u/drm/amd/display/amdgpu_dm/amdgpu_dm.c index bb5e3a6086f2..deaf98957cb7 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -9293,6 +9293,7 @@ static int dm_update_crtc_state(struct amdgpu_display= _manager *dm, /* Release extra reference */ if (new_stream) dc_stream_release(new_stream); + new_stream =3D NULL; =20 /* * We want to do dc stream updates that do not require a --=20 2.53.0