From patchwork Mon Aug 29 08:05:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 600888 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 754A0C64991 for ; Mon, 29 Aug 2022 08:06:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229798AbiH2IGw (ORCPT ); Mon, 29 Aug 2022 04:06:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229784AbiH2IGs (ORCPT ); Mon, 29 Aug 2022 04:06:48 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6658A5282D; Mon, 29 Aug 2022 01:06:47 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C6F69B80D64; Mon, 29 Aug 2022 08:06:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82197C433B5; Mon, 29 Aug 2022 08:06:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661760404; bh=EXEzU9O3c7+eI/vI4BoKI0XiPzlDZwpzrxTE7ddbiQw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CzNspwFPE/7c/OBlx2eljllkVfd5/QXZkYTL6C9GTwgUuMYMv8uDxsoGX0y0Fbfa2 lRHS1S8npu0BeAp7whjx8qyIRnwU/AN6bPC1leBrtVsB1ddYlgqgnzY29HZvzCU2Pq TMb2yax8WZVKvTfuUIM5LsQkP9NuJ7GSukMjbkwrF3v/thxKEf2KFLYtiiLTy4QX4X DfW9WuYeuKJ4fAkPk9qz1DkEyccme7x7vS24P4ujNJ5QtCdZa1sgYgcNXHsjNwzTZo QzXW3kFeADFdceIO0L/gMjGxbVFeGby6huffKmlygICKA/wefC7pJLNDjs+4S7SEM1 FOo1gMkCK83Eg== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1oSZnI-0007jU-19; Mon, 29 Aug 2022 10:06:52 +0200 From: Johan Hovold To: Srinivas Kandagatla , Amol Maheshwari Cc: Greg Kroah-Hartman , Arnd Bergmann , Bjorn Andersson , Manivannan Sadhasivam , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org Subject: [PATCH 1/3] misc: fastrpc: fix memory corruption on probe Date: Mon, 29 Aug 2022 10:05:29 +0200 Message-Id: <20220829080531.29681-2-johan+linaro@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220829080531.29681-1-johan+linaro@kernel.org> References: <20220829080531.29681-1-johan+linaro@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add the missing sanity check on the probed-session count to avoid corrupting memory beyond the fixed-size slab-allocated session array when there are more than FASTRPC_MAX_SESSIONS sessions defined in the devicetree. Fixes: f6f9279f2bf0 ("misc: fastrpc: Add Qualcomm fastrpc basic driver model") Cc: stable@vger.kernel.org # 5.1 Signed-off-by: Johan Hovold --- drivers/misc/fastrpc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 93ebd174d848..88091778c1b8 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -1943,6 +1943,11 @@ static int fastrpc_cb_probe(struct platform_device *pdev) of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); spin_lock_irqsave(&cctx->lock, flags); + if (cctx->sesscount >= FASTRPC_MAX_SESSIONS) { + dev_err(&pdev->dev, "too many sessions\n"); + spin_unlock_irqrestore(&cctx->lock, flags); + return -ENOSPC; + } sess = &cctx->session[cctx->sesscount]; sess->used = false; sess->valid = true;