From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E437753A89E for ; Wed, 9 Sep 2026 11:07:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788952069; cv=none; b=T/5fPB12umy86plNBB0gVPRz4phi2a4nLcYbGItHQCVUhETRIJE42Fz+W5RkcafcUWPkKtQVZZEob6MhKNUnRU5OUlX/qbHXe9TyrI+XR1fpfa1LMTMkYs8DiWXc++brXvDeU+Fm3mjV7RRcwJALSrM0Zv5UjvU/DNvWJFX4yJs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788952069; c=relaxed/simple; bh=l+vPXRxm5sXZIKNEnzZmxqdEYDW4PC8TT2TDeuZCs3o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ARnu5XaDAbhjk+20pOKkL5+GkR2kG7uN6fFoFMJDQKgy+nRcGO2bDpswi0eKOfv9jJvBCXCDP3ijLHUa+m3nTs+/6F9xTVoeWABxaLwKqtja4Sy4/FwlHP/g+kMbL80sK3Ge4MSbm9HTlOEzxx7r6kLMahkPiTNELfR1T6p+VVo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=N3PIhKz5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="N3PIhKz5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 560AE1F01569; Wed, 9 Sep 2026 11:07:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788952061; bh=75QD3h7gOcbE9IpaP7R4wa5g4nTaax4x9q5Z8vvtHds=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=N3PIhKz5wr56OmEWaru/UZWci6jhbJB3U6Pjz8BME7qBRo5JpikodqJa4/BXjGYXV d2jBP1PCA6eeqmePM9uCqTJ/9GlBGPHyqsNrYn41Q4542FqRk1sPKI8oWm2mQxQuWm txQqXMtThcgib+z/unoP35zv6d6CGGsscIIabAFHjc4DCxLCMLjeZwvu+DNTBRZ5KZ oONYauY0LuVbwcFXXkpoobyU4cqdz1YAqiDL5HRyZkIfPSoc83FyCT9bsrPcWwByhy D+eM89Nmg/apGVOhnwY3c7QCr1zrkT4AxA6UaJH/N+7wrSQq6sZoXigBRttEDlRt+I RomJio0BYJv0Q== From: Sasha Levin To: stable@vger.kernel.org Cc: Fan Wu , Sebastian Reichel , Sasha Levin Subject: [PATCH 5.15.y 3/3] power: supply: lp8788-charger: fix use-after-free on remove Date: Wed, 9 Sep 2026 07:07:37 -0400 Message-ID: <20260909110737.1741580-3-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260909110737.1741580-1-sashal@kernel.org> References: <2026090352-endanger-avenue-c367@gregkh> <20260909110737.1741580-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Fan Wu [ Upstream commit 831c29a12d560f8a3225f43050b3fbb5dfd79c66 ] lp8788_charger_remove() flushes charger_work before unregistering the IRQs. An IRQ thread can queue charger_work after flush_work() has returned. The work can then run after devres frees pchg and dereference it in lp8788_charger_event(). Unregister the IRQs first. free_irq() waits for any running threaded handler, so no handler can queue more work afterwards. Then use cancel_work_sync() to cancel pending work or wait for running work to finish. This issue was found by an in-house static analysis tool. Fixes: 98a276649358 ("power_supply: Add new lp8788 charger driver") Cc: stable@vger.kernel.org Assisted-by: Codex:gpt-5.6 Signed-off-by: Fan Wu Link: https://patch.msgid.link/20260802035442.421697-1-fanwu01@zju.edu.cn Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/supply/lp8788-charger.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/power/supply/lp8788-charger.c b/drivers/power/supply/lp8788-charger.c index 54f663ba95700..3cd2238fc5d8d 100644 --- a/drivers/power/supply/lp8788-charger.c +++ b/drivers/power/supply/lp8788-charger.c @@ -711,8 +711,8 @@ static void lp8788_charger_remove(struct platform_device *pdev) { struct lp8788_charger *pchg = platform_get_drvdata(pdev); - flush_work(&pchg->charger_work); lp8788_irq_unregister(pdev, pchg); + cancel_work_sync(&pchg->charger_work); } static struct platform_driver lp8788_charger_driver = { -- 2.53.0