Subject: FAILED: patch "[PATCH] drm/amdgpu: Fix acpi device leak in" failed to apply to 6.6-stable tree
To: vulab@iscas.ac.cn,alexander.deucher@amd.com,lijo.lazar@amd.com
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Tue, 29 Sep 2026 10:18:57 +0200
Message-ID: <2026092957-surreal-herring-0708@gregkh>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=ANSI_X3.4-1968
Content-Transfer-Encoding: 8bit


The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x a997baa61179b450bd55c4810c7ccfed3b753a54
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026092957-surreal-herring-0708@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:


thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a997baa61179b450bd55c4810c7ccfed3b753a54 Mon Sep 17 00:00:00 2001
From: Wentao Liang <vulab@iscas.ac.cn>
Date: Wed, 16 Sep 2026 09:54:32 +0000
Subject: [PATCH] drm/amdgpu: Fix acpi device leak in
 amdgpu_acpi_enumerate_xcc()

amdgpu_acpi_enumerate_xcc() looks up each XCC ACPI device with
acpi_dev_get_first_match_dev(), which takes a reference to the device.
The reference is dropped with acpi_dev_put() after the XCC info is
initialized, but if the kzalloc_obj() allocation of the XCC info fails
the function returns -ENOMEM without releasing the reference, leaking
the last reference to the ACPI device.

Drop the ACPI device reference on the allocation failure path before
returning.

Fixes: 4d5275ab0b18 ("drm/amdgpu: Add parsing of acpi xcc objects")
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 9211ef48b31ec66999cf55e04d0cbc60cd855fd5)
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 7f5abb03be1b..8b8acf98fdfe 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -1167,8 +1167,10 @@ int amdgpu_acpi_enumerate_xcc(void)
 		}
 
 		xcc_info = kzalloc_obj(struct amdgpu_acpi_xcc_info);
-		if (!xcc_info)
+		if (!xcc_info) {
+			acpi_dev_put(acpi_dev);
 			return -ENOMEM;
+		}
 
 		INIT_LIST_HEAD(&xcc_info->list);
 		xcc_info->handle = acpi_device_handle(acpi_dev);