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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	Pei Xiao <xiaopei01@kylinos.cn>,
	Stable@vger.kernel.org,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH 6.6 189/254] iio: adc: at91-sama5d2_adc: Fix potential use-after-free in sama5d2_adc driver
Date: Wed, 28 Jan 2026 16:22:45 +0100
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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pei Xiao <xiaopei01@kylinos.cn>

commit dbdb442218cd9d613adeab31a88ac973f22c4873 upstream.

at91_adc_interrupt can call at91_adc_touch_data_handler function
to start the work by schedule_work(&st->touch_st.workq).

If we remove the module which will call at91_adc_remove to
make cleanup, it will free indio_dev through iio_device_unregister but
quite a bit later. While the work mentioned above will be used. The
sequence of operations that may lead to a UAF bug is as follows:

CPU0                                      CPU1

                                     | at91_adc_workq_handler
at91_adc_remove                      |
iio_device_unregister(indio_dev)     |
//free indio_dev a bit later         |
                                     | iio_push_to_buffers(indio_dev)
                                     | //use indio_dev

Fix it by ensuring that the work is canceled before proceeding with
the cleanup in at91_adc_remove.

Fixes: 23ec2774f1cc ("iio: adc: at91-sama5d2_adc: add support for position and pressure channels")
Signed-off-by: Pei Xiao <xiaopei01@kylinos.cn>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iio/adc/at91-sama5d2_adc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -2504,6 +2504,7 @@ static int at91_adc_remove(struct platfo
 	struct at91_adc_state *st = iio_priv(indio_dev);
 
 	iio_device_unregister(indio_dev);
+	cancel_work_sync(&st->touch_st.workq);
 
 	at91_adc_dma_disable(st);
 




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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	Samuel Wu <wusamuel@google.com>,
	Alex Hoh <Alex.Hoh@mediatek.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.12 082/169] sched/fair: Fix pelt clock sync when entering idle
Date: Wed, 28 Jan 2026 16:22:45 +0100
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6.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vincent Guittot <vincent.guittot@linaro.org>

[ Upstream commit 98c88dc8a1ace642d9021b103b28cba7b51e3abc ]

Samuel and Alex reported regressions of the util_avg of RT rq with
commit 17e3e88ed0b6 ("sched/fair: Fix pelt lost idle time detection").
It happens that fair is updating and syncing the pelt clock with task one
when pick_next_task_fair() fails to pick a task but before the prev
scheduling class got a chance to update its pelt signals.

Move update_idle_rq_clock_pelt() in set_next_task_idle() which is called
after prev class has been called.

Fixes: 17e3e88ed0b6 ("sched/fair: Fix pelt lost idle time detection")
Closes: https://lore.kernel.org/all/CAG2KctpO6VKS6GN4QWDji0t92_gNBJ7HjjXrE+6H+RwRXt=iLg@mail.gmail.com/
Closes: https://lore.kernel.org/all/8cf19bf0e0054dcfed70e9935029201694f1bb5a.camel@mediatek.com/
Reported-by: Samuel Wu <wusamuel@google.com>
Reported-by: Alex Hoh <Alex.Hoh@mediatek.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Samuel Wu <wusamuel@google.com>
Tested-by: Alex Hoh <Alex.Hoh@mediatek.com>
Link: https://patch.msgid.link/20260121163317.505635-1-vincent.guittot@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 kernel/sched/fair.c | 6 ------
 kernel/sched/idle.c | 6 ++++++
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1436d6bb86ec4..6efb1dfcd943a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9033,12 +9033,6 @@ pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf
 			goto again;
 	}
 
-	/*
-	 * rq is about to be idle, check if we need to update the
-	 * lost_idle_time of clock_pelt
-	 */
-	update_idle_rq_clock_pelt(rq);
-
 	return NULL;
 }
 
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 53bb9193c537a..624ef809f6715 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -462,6 +462,12 @@ static void set_next_task_idle(struct rq *rq, struct task_struct *next, bool fir
 	scx_update_idle(rq, true, true);
 	schedstat_inc(rq->sched_goidle);
 	next->se.exec_start = rq_clock_task(rq);
+
+	/*
+	 * rq is about to be idle, check if we need to update the
+	 * lost_idle_time of clock_pelt
+	 */
+	update_idle_rq_clock_pelt(rq);
 }
 
 struct task_struct *pick_task_idle(struct rq *rq)
-- 
2.51.0





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ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) heae/cli.js:689:2042)
    at async sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1197)
2026-01-28T16:37:40.543Z [ERROR] Error: Error: {"stack":"Error: Failed to export 28 events\n    at sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1299)","message":"Failed to export 28 events","name":"Error"}
    at Jf6.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:1860:34863)
    at v46.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:7018)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38043
    at $r3 (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38589)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:684:20245
2026-01-28T16:37:41.851Z [DEBUG] MCP server "ide": Tool 'openDiff' still running (690s elapsed)
2026-01-28T16:37:50.439Z [ERROR] Error: Error: 1P event logging: 14 events failed to export
    at sK6.queueFailedEvents (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:2042)
    at async sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1197)
2026-01-28T16:37:50.439Z [ERROR] Error: Error: {"stack":"Error: Failed to export 14 events\n    at sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1299)","message":"Failed to export 14 events","name":"Error"}
    at Jf6.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:1860:34863)
    at v46.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:7018)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38043
    at $r3 (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38589)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:684:20245
2026-01-28T16:37:55.695Z [ERROR] Error: Error: 1P event logging: 28 events failed to export
    at sK6.queueFailedEvents (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:2042)
    at async sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1197)
2026-01-28T16:37:55.695Z [ERROR] Error: Error: {"stack":"Error: Failed to export 28 events\n    at sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1299)","message":"Failed to export 28 events","name":"Error"}
    at Jf6.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:1860:34863)
    at v46.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:7018)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38043
    at $r3 (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38589)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:684:20245
2026-01-28T16:38:05.588Z [ERROR] Error: Error: 1P event logging: 14 events failed to export
    at sK6.queueFailedEvents (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:2042)
    at async sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1197)
2026-01-28T16:38:05.589Z [ERROR] Error: Error: {"stack":"Error: Failed to export 14 events\n    at sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1299)","message":"Failed to export 14 events","name":"Error"}
    at Jf6.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:1860:34863)
    at v46.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:7018)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38043
    at $r3 (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38589)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:684:20245
2026-01-28T16:38:10.844Z [ERROR] Error: Error: 1P event logging: 28 events failed to export
    at sK6.queueFailedEvents (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:2042)
    at async sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1197)
2026-01-28T16:38:10.844Z [ERROR] Error: Error: {"stack":"Error: Failed to export 28 events\n    at sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1299)","message":"Failed to export 28 events","name":"Error"}
    at Jf6.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:1860:34863)
    at v46.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:7018)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38043
    at $r3 (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38589)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:684:20245
2026-01-28T16:38:11.850Z [DEBUG] MCP server "ide": Tool 'openDiff' still running (720s elapsed)
2026-01-28T16:38:20.745Z [ERROR] Error: Error: 1P event logging: 14 events failed to export
    at sK6.queueFailedEvents (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:2042)
    at async sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1197)
2026-01-28T16:38:20.746Z [ERROR] Error: Error: {"stack":"Error: Failed to export 14 events\n    at sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1299)","message":"Failed to export 14 events","name":"Error"}
    at Jf6.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:1860:34863)
    at v46.error (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:7018)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38043
    at $r3 (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:683:38589)
    at file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:684:20245
2026-01-28T16:38:26.003Z [ERROR] Error: Error: 1P event logging: 28 events failed to export
    at sK6.queueFailedEvents (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:2042)
    at async sK6.doExport (file:///home/josie/.config/nvm/versions/node/v20.19.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:689:1197)
2026-01-28T16:38:26.003Z [ERROR] Error: Error: {"stack":"Error: Failed-b660-dbad011b7314","isSidechain":false,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch/notes","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","slug":"purrfect-soaring-sunbeam","message":{"model":"claude-opus-4-5-20251101","id":"msg_015gW5PDcz6oNLvzUQYu7FV6","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01EYxo2HgecZ6e9xzDybotMy","name":"Bash","input":{"command":"mmdc -i /home/josie/development/archlinux/s390-arch/notes/diagrams/boot-sequence.mmd -o /home/josie/development/archlinux/s390-arch/notes/diagrams/boot-sequence.png -c /home/josie/development/archlinux/s390-arch/notes/diagrams/mermaid-config.json -b transparent","description":"Render boot sequence row 1","timeout":30000}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":8,"cache_creation_input_tokens":74249,"cache_read_input_tokens":0,"cache_creation":{"ephemeral_5m_input_tokens":74249,"ephemeral_1h_input_tokens":0},"output_tokens":7,"service_tier":"standard"}},"requestId":"req_011CXa9Mode6xRncHzgij9YJ","type":"assistant","uuid":"01586b8d-0493-4e1b-b53b-37ed47a21d2d","timestamp":"2026-01-28T17:09:03.629Z"}
{"parentUuid":"01586b8d-0493-4e1b-b53b-37ed47a21d2d","isSidechain":false,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch/notes","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","slug":"purrfect-soaring-sunbeam","message":{"model":"claude-opus-4-5-20251101","id":"msg_015gW5PDcz6oNLvzUQYu7FV6","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01QbQdyQCSSH4D6Thgp87LHc","name":"Bash","input":{"command":"mmdc -i /home/josie/development/archlinux/s390-arch/notes/diagrams/boot-sequence-2.mmd -o /home/josie/development/archlinux/s390-arch/notes/diagrams/boot-sequence-2.png -c /home/josie/development/archlinux/s390-arch/notes/diagrams/mermaid-config.json -b transparent","description":"Render boot sequence row 2","timeout":30000}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":8,"cache_creation_input_tokens":74249,"cache_read_input_tokens":0,"cache_creation":{"ephemeral_5m_input_tokens":74249,"ephemeral_1h_input_tokens":0},"output_tokens":7,"service_tier":"standard"}},"requestId":"req_011CXa9Mode6xRncHzgij9YJ","type":"assistant","uuid":"07b70e85-aad5-46d6-8ed1-a6ad17110d72","timestamp":"2026-01-28T17:09:04.784Z"}
{"parentUuid":"07b70e85-aad5-46d6-8ed1-a6ad17110d72","isSidechain":false,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch/notes","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","slug":"purrfect-soaring-sunbeam","type":"progress","data":{"type":"hook_progress","hookEvent":"PreToolUse","hookName":"PreToolUse:Bash","command":"python3 ${CLAUDE_PLUGIN_ROOT}/hooks/pretooluse.py"},"toolUseID":"toolu_01EYxo2HgecZ6e9xzDybotMy","parentToolUseID":"toolu_01EYxo2HgecZ6e9xzDybotMy","uuid":"fcb9baa2-f602-4fcf-9a64-5680c9d9c3b2","timestamp":"2026-01-28T17:09:04.840Z"}
{"parentUuid":"01586b8d-0493-4e1b-b53b-37ed47a21d2d","isSidechain":false,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch/notes","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","slug":"purrfect-soaring-sunbeam","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01EYxo2HgecZ6e9xzDybotMy","type":"tool_result","content":"Generating single mermaid chart","is_error":false}]},"uuid":"304e6436-b616-4013-b687-3671a927c15c","timestamp":"2026-01-28T17:22:29.599Z","toolUseResult":{"stdout":"Generating single mermaid chart","stderr":"","interrupted":false,"isImage":false},"sourceToolAssistantUUID":"01586b8d-0493-4e1b-b53b-37ed47a21d2d"}
{"parentUuid":"304e6436-b616-4013-b687-3671a927c15c","isSidechain":false,"userType":"external","cwd":"/home/josie/development/archlinux/s390-arch/notes","sessionId":"c1fdf23c-acf3-4b1f-a3df-1b7acf06bfa7","version":"2.1.19","gitBranch":"main","slug":"purrfect-soaring-sunbeam","type":"progress","data":{"type":"hook_progress","