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 X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B9B3FC282CE for ; Wed, 22 May 2019 19:29:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 83650217D4 for ; Wed, 22 May 2019 19:29:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558553385; bh=WRDWdcYe/dmdSqigJ92qRz3Bm1CJW3V6dtXb0v4xKY8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FFhoWYAe8Xa7N2wlOwxhFql+Lur32SeNpGs6MwZY0q2f1t0fv88gi0G9SOKt8OMHi TBRfkazFzbikCrQ1qxzt0QBaBGTAtuG6RFwKv1xeJAh+OSe4bOKsYZRNAf/a4d4RBT mssK3OPbB4DUOmUTIwQ76wFm7Edn8bsHv4A2dV1g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733019AbfEVT3o (ORCPT ); Wed, 22 May 2019 15:29:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:52802 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732968AbfEVT3j (ORCPT ); Wed, 22 May 2019 15:29:39 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 18EA92177E; Wed, 22 May 2019 19:29:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558553378; bh=WRDWdcYe/dmdSqigJ92qRz3Bm1CJW3V6dtXb0v4xKY8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zWqnZW7BlLWqZXMu5rRXxnaRdl9taiF6C01v2H2E6g5RJ84Coit7KVas9ZjiDi+yM A8JoKe32/APCtMPZShrdLVhITm2jFFePlFMgVyCc3ZV1kbuPHVdFf1pauejiBRC0ei wxMVxLSkCjq0ITXmyPWPIYY1fRF5LVYQ+VwXu6f4= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dan Carpenter , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 038/167] mwifiex: prevent an array overflow Date: Wed, 22 May 2019 15:26:33 -0400 Message-Id: <20190522192842.25858-38-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190522192842.25858-1-sashal@kernel.org> References: <20190522192842.25858-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dan Carpenter [ Upstream commit b4c35c17227fe437ded17ce683a6927845f8c4a4 ] The "rate_index" is only used as an index into the phist_data->rx_rate[] array in the mwifiex_hist_data_set() function. That array has MWIFIEX_MAX_AC_RX_RATES (74) elements and it's used to generate some debugfs information. The "rate_index" variable comes from the network skb->data[] and it is a u8 so it's in the 0-255 range. We need to cap it to prevent an array overflow. Fixes: cbf6e05527a7 ("mwifiex: add rx histogram statistics support") Signed-off-by: Dan Carpenter Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/marvell/mwifiex/cfp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/cfp.c b/drivers/net/wireless/marvell/mwifiex/cfp.c index bfe84e55df776..f1522fb1c1e87 100644 --- a/drivers/net/wireless/marvell/mwifiex/cfp.c +++ b/drivers/net/wireless/marvell/mwifiex/cfp.c @@ -531,5 +531,8 @@ u8 mwifiex_adjust_data_rate(struct mwifiex_private *priv, rate_index = (rx_rate > MWIFIEX_RATE_INDEX_OFDM0) ? rx_rate - 1 : rx_rate; + if (rate_index >= MWIFIEX_MAX_AC_RX_RATES) + rate_index = MWIFIEX_MAX_AC_RX_RATES - 1; + return rate_index; } -- 2.20.1