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 B9FF12225D6; Fri, 4 Oct 2024 18:19:21 +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=1728065961; cv=none; b=mnizz6M+r2ry2f3oSkk0by29/6Gq8CtIglIcNNKt+YJbQkH5+ZHCcXPJffvgZpcgKzk0VEVF7vxD4YLkssoD7B7phHxfeWfgtSybw8xVRdvVBUZfARa+p7otHRwtVOScvXC0GPyDY/4LzAmztmR6l6KxBgckPXwgnpEDXhSW+QI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728065961; c=relaxed/simple; bh=NpFwHIc43h0KX6FekzSz+SQmAEBtDGBPknm+Mi89JxY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VINFhtnqfLmcusK9U5Hyg9MQpbmb0wsQ45uNffPZzHgdR+d/JKcJm37kCVIKcnJxioNNjoO70MS2JE3qJeAg4cjof69SwUm98lu2FQ8XAQkhOviplhk+UhxWGHiRfi1VAgSMmbpxGqz+pV2BTS4mIOBVTAWKobuTRN/MIrLeFDI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=atZlRSE+; 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="atZlRSE+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C36ACC4CED1; Fri, 4 Oct 2024 18:19:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728065961; bh=NpFwHIc43h0KX6FekzSz+SQmAEBtDGBPknm+Mi89JxY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=atZlRSE+feSWT/OnsAtmMaBbJfJwZh4GITdsvhiJnw0PtW3qCuODVZsnzsKKlpjY2 9SRZCPqnISmUFIoRRrDp/0k/XhelCSAMr2E6GelPGIAvBvBDG27hsbmiv7uM7R2bXZ PJf2PaMPHcxrCye9DgU6OMQLg8vK/2RzpyHu5tdhWd86N+psgd99Sq1EPzYHmSwsXh 3MdBcZsBgKzq5hqMOSm6Iyzr1M7Hn2dlUcEztrYny25g1WBIScHeIk9ig58DL3uhfs lfOWWHRWuwGzpsmGdINkVq5uvnQkTKV2YJBvcGhwshTPt977OW3SB8qQAjJzNTG621 uHh4F6W1CQf5w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kaixin Wang , Alexandre Belloni , Sasha Levin , pgaj@cadence.com, linux-i3c@lists.infradead.org Subject: [PATCH AUTOSEL 6.11 30/76] i3c: master: cdns: Fix use after free vulnerability in cdns_i3c_master Driver Due to Race Condition Date: Fri, 4 Oct 2024 14:16:47 -0400 Message-ID: <20241004181828.3669209-30-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241004181828.3669209-1-sashal@kernel.org> References: <20241004181828.3669209-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.11.2 Content-Transfer-Encoding: 8bit From: Kaixin Wang [ Upstream commit 609366e7a06d035990df78f1562291c3bf0d4a12 ] In the cdns_i3c_master_probe function, &master->hj_work is bound with cdns_i3c_master_hj. And cdns_i3c_master_interrupt can call cnds_i3c_master_demux_ibis function to start the work. If we remove the module which will call cdns_i3c_master_remove to make cleanup, it will free master->base through i3c_master_unregister while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | cdns_i3c_master_hj cdns_i3c_master_remove | i3c_master_unregister(&master->base) | device_unregister(&master->dev) | device_release | //free master->base | | i3c_master_do_daa(&master->base) | //use master->base Fix it by ensuring that the work is canceled before proceeding with the cleanup in cdns_i3c_master_remove. Signed-off-by: Kaixin Wang Link: https://lore.kernel.org/r/20240911153544.848398-1-kxwang23@m.fudan.edu.cn Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/i3c/master/i3c-master-cdns.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c index c1627f3552ce3..c2d26beb3da2b 100644 --- a/drivers/i3c/master/i3c-master-cdns.c +++ b/drivers/i3c/master/i3c-master-cdns.c @@ -1666,6 +1666,7 @@ static void cdns_i3c_master_remove(struct platform_device *pdev) { struct cdns_i3c_master *master = platform_get_drvdata(pdev); + cancel_work_sync(&master->hj_work); i3c_master_unregister(&master->base); clk_disable_unprepare(master->sysclk); -- 2.43.0