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 95F50C77B6C for ; Mon, 3 Apr 2023 14:21:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233104AbjDCOVZ (ORCPT ); Mon, 3 Apr 2023 10:21:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233057AbjDCOVT (ORCPT ); Mon, 3 Apr 2023 10:21:19 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 455DC312AD for ; Mon, 3 Apr 2023 07:21:00 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 56C0061D32 for ; Mon, 3 Apr 2023 14:20:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6ED46C4339E; Mon, 3 Apr 2023 14:20:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531635; bh=Tn9J1rkF8CqebWI3HPjC16L/ibAVABXU/64SeSXTrBk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1AJhJvvOR+rE/XlenjwETNgcqhDRfDFlVWKTHGpt1yBjB1+dZ6abdbZ2RZthy7VqT w7NtrpbKquM5c4uX7Qwaq9EkNVGygLrzi0HmrBvj+jyqgEjsslUlRYEvOv7/5SICRG lJk4W6djJIADzVUL3YV/Bn0d/Q6gZxVELu42vnvg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wei Chen , Andi Shyti , Wolfram Sang Subject: [PATCH 5.4 053/104] i2c: xgene-slimpro: Fix out-of-bounds bug in xgene_slimpro_i2c_xfer() Date: Mon, 3 Apr 2023 16:08:45 +0200 Message-Id: <20230403140406.407933882@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140403.549815164@linuxfoundation.org> References: <20230403140403.549815164@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: Wei Chen commit 92fbb6d1296f81f41f65effd7f5f8c0f74943d15 upstream. The data->block[0] variable comes from user and is a number between 0-255. Without proper check, the variable may be very large to cause an out-of-bounds when performing memcpy in slimpro_i2c_blkwr. Fix this bug by checking the value of writelen. Fixes: f6505fbabc42 ("i2c: add SLIMpro I2C device driver on APM X-Gene platform") Signed-off-by: Wei Chen Cc: stable@vger.kernel.org Reviewed-by: Andi Shyti Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-xgene-slimpro.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/i2c/busses/i2c-xgene-slimpro.c +++ b/drivers/i2c/busses/i2c-xgene-slimpro.c @@ -308,6 +308,9 @@ static int slimpro_i2c_blkwr(struct slim u32 msg[3]; int rc; + if (writelen > I2C_SMBUS_BLOCK_MAX) + return -EINVAL; + memcpy(ctx->dma_buffer, data, writelen); paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen, DMA_TO_DEVICE);