From mboxrd@z Thu Jan 1 00:00:00 1970 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 75938C6FA83 for ; Tue, 6 Sep 2022 13:50:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238701AbiIFNuk (ORCPT ); Tue, 6 Sep 2022 09:50:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234289AbiIFNrn (ORCPT ); Tue, 6 Sep 2022 09:47:43 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 652DA7F278; Tue, 6 Sep 2022 06:39:10 -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 sin.source.kernel.org (Postfix) with ESMTPS id 3F996CE1779; Tue, 6 Sep 2022 13:38:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F6EEC433D6; Tue, 6 Sep 2022 13:38:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1662471482; bh=RGb7/zAtVJBSBWhhk2OQ6Qt6vTGoxALVQ1v5opqZyAU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZHrElLfP+Q80M9ylxQofME7ayW/ocw7vx5dMbHNNGL4EA8Vk1c/rE3Tit9C+I1Ka6 vQUiSetIIgZ/9FFCPezvU394qfgmZjtjJ5WxFcQzRhfgQ0kgzOIOH4iS3H9AUvkzLQ xJYaSZlKSGQTJYTgx+pSWOvNvLS4etWjpozQn37E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold Subject: [PATCH 5.15 042/107] misc: fastrpc: fix memory corruption on open Date: Tue, 6 Sep 2022 15:30:23 +0200 Message-Id: <20220906132823.598465098@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220906132821.713989422@linuxfoundation.org> References: <20220906132821.713989422@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold commit d245f43aab2b61195d8ebb64cef7b5a08c590ab4 upstream. The probe session-duplication overflow check incremented the session count also when there were no more available sessions so that memory beyond the fixed-size slab-allocated session array could be corrupted in fastrpc_session_alloc() on open(). Fixes: f6f9279f2bf0 ("misc: fastrpc: Add Qualcomm fastrpc basic driver model") Cc: stable@vger.kernel.org # 5.1 Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20220829080531.29681-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/misc/fastrpc.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -1555,7 +1555,7 @@ static int fastrpc_cb_probe(struct platf spin_unlock_irqrestore(&cctx->lock, flags); return -ENOSPC; } - sess = &cctx->session[cctx->sesscount]; + sess = &cctx->session[cctx->sesscount++]; sess->used = false; sess->valid = true; sess->dev = dev; @@ -1568,13 +1568,12 @@ static int fastrpc_cb_probe(struct platf struct fastrpc_session_ctx *dup_sess; for (i = 1; i < sessions; i++) { - if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS) + if (cctx->sesscount >= FASTRPC_MAX_SESSIONS) break; - dup_sess = &cctx->session[cctx->sesscount]; + dup_sess = &cctx->session[cctx->sesscount++]; memcpy(dup_sess, sess, sizeof(*dup_sess)); } } - cctx->sesscount++; spin_unlock_irqrestore(&cctx->lock, flags); rc = dma_set_mask(dev, DMA_BIT_MASK(32)); if (rc) {