From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4409E270545 for ; Sat, 28 Feb 2026 18:09:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302176; cv=none; b=hZVFjpoS/Geeo5+SLDygC4B1OYIBy9qBLjawjoUE0LdX9GtVsnDWi7RTCu6Ld/omrQlvvK3R+Y7k3XWJlsUUWSSpJxOqZuXND0uVCNITjvrZp5WVachGVQdiL3s5zLzWx4mnNlS1PReSJ0oQbxhhZA5bT/eQesehFIzAKZIHehQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302176; c=relaxed/simple; bh=ZI8EmwhkU14hhjxXFFt7gI5cGF9/AuGaxZmmSrSOXo4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IIsYwK4hAeWJXmltmmnLGSRZ71Z++ZsPOHTnYf/iGQvesG8wY0lYfphbnYgDONPhFcZcPFSGOfqfDnYhbAGvVPIrvN2/yRe/VLbLEHH8+TQg6fA3wN28RM0mcMFkd+BADAqNJZeu1lbnInonPkA2HqOqacq42HdKwr3+4Q8TXu8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=szmQKXjz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="szmQKXjz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8121C116D0; Sat, 28 Feb 2026 18:09:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302176; bh=ZI8EmwhkU14hhjxXFFt7gI5cGF9/AuGaxZmmSrSOXo4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=szmQKXjzRhHD4ZLyxZbL6oaK64OhLQ3MjRo0/k/mkg4tc3Uu9W04Gfplk7mxv8vSN 64DS/AOFrzIvnmxxORLQ0DgOw9MFZo/6zLvv9txQT84Riw4Ta0F9HBTNOtranUN2fp HV0xL/xm4GzztvngawH27racJQGUkqk3Nc0YdxAu68iNqvDw5fic/SUx2u61jMY6R7 MLjQyMFhep/6sOWg62qe0oZSa4G1njIZtG3Itf9Yp193lYqCDpiGKhL87qjUwpJFP5 Zn5z0xSIBBi3pv/cyqGteqbjkazZ5WQBTQUHLPyDMaZ4cZ4LRPHJg4MmpNc72LRgrP N+pGiiBdIkyDA== From: Sasha Levin To: patches@lists.linux.dev Cc: Waqar Hameed , Sebastian Reichel , Sasha Levin Subject: [PATCH 6.6 175/283] power: supply: goldfish: Fix use-after-free in power_supply_changed() Date: Sat, 28 Feb 2026 13:05:17 -0500 Message-ID: <20260228180709.1583486-175-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228180709.1583486-1-sashal@kernel.org> References: <20260228180709.1583486-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Waqar Hameed [ Upstream commit b2ce982e2e0c888dc55c888ad0e20ea04daf2e6b ] Using the `devm_` variant for requesting IRQ _before_ the `devm_` variant for allocating/registering the `power_supply` handle, means that the `power_supply` handle will be deallocated/unregistered _before_ the interrupt handler (since `devm_` naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just _after_ the `power_supply` handle has been freed, *but* just _before_ the corresponding unregistration of the IRQ handler has run. This will lead to the IRQ handler calling `power_supply_changed()` with a freed `power_supply` handle. Which usually crashes the system or otherwise silently corrupts the memory... Note that there is a similar situation which can also happen during `probe()`; the possibility of an interrupt firing _before_ registering the `power_supply` handle. This would then lead to the nasty situation of using the `power_supply` handle *uninitialized* in `power_supply_changed()`. Fix this racy use-after-free by making sure the IRQ is requested _after_ the registration of the `power_supply` handle. Fixes: 84d7b7687489 ("power: Add battery driver for goldfish emulator") Signed-off-by: Waqar Hameed Link: https://patch.msgid.link/500a606bb6fb6f2bb8d797e19a00cea9dd7b03c1.1766268280.git.waqar.hameed@axis.com Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/supply/goldfish_battery.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/power/supply/goldfish_battery.c b/drivers/power/supply/goldfish_battery.c index a58d713d75ce8..4d204f0e18532 100644 --- a/drivers/power/supply/goldfish_battery.c +++ b/drivers/power/supply/goldfish_battery.c @@ -224,12 +224,6 @@ static int goldfish_battery_probe(struct platform_device *pdev) if (data->irq < 0) return -ENODEV; - ret = devm_request_irq(&pdev->dev, data->irq, - goldfish_battery_interrupt, - IRQF_SHARED, pdev->name, data); - if (ret) - return ret; - psy_cfg.drv_data = data; data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg); @@ -245,6 +239,12 @@ static int goldfish_battery_probe(struct platform_device *pdev) platform_set_drvdata(pdev, data); + ret = devm_request_irq(&pdev->dev, data->irq, + goldfish_battery_interrupt, + IRQF_SHARED, pdev->name, data); + if (ret) + return ret; + GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK); return 0; } -- 2.51.0