From patchwork Sat Jan 15 04:24:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 12714318 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 34539C4332F for ; Sat, 15 Jan 2022 04:24:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232463AbiAOEYn (ORCPT ); Fri, 14 Jan 2022 23:24:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230334AbiAOEYa (ORCPT ); Fri, 14 Jan 2022 23:24:30 -0500 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF3A9C061574 for ; Fri, 14 Jan 2022 20:24:30 -0800 (PST) Received: by mail-pf1-x42c.google.com with SMTP id 128so4530155pfe.12 for ; Fri, 14 Jan 2022 20:24:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=EtNhvDKyXQZ6Jo36sZZYMctRg/Y7isVGvsp0Av2OLNI=; b=hUzYCGC55NH+cf3c7waBsuULipT4Kpa+W+PA6ihbTRK8lLC1JncQ1OMXHYRbROa0zh OUzv4bFaAIKnuyK/uvPaI7YxbRKSxMKkgFIqg2n9QlkWLPo4sIsWOLmi7EMma/m0sahy zThEmlNRip4lD3IG4ClYwZ2LyVwmVEvoF9OMc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=EtNhvDKyXQZ6Jo36sZZYMctRg/Y7isVGvsp0Av2OLNI=; b=z+0U3Psru0AEWpM7zuelcul8hlO7s2IsiB1HUlMWgbbHC5yYauoo3SFhjAUqls15sT Dkfldf+jAhtoApP+kZxQ8wtjP35qGXKRkV86Rct4nMiKdvlH7PwM02lFstKFrjL0m8Zg cLbawKtDj+ZVcy/cdCT2t1fUnBAv9XNsGpHS2oKPl8R8DffbK9htH24UMavM4XxKVwQn +BQqxLRNtWOUtySQZmSFjKfrIEFgr7Pv2ojXHwamtcUnGPMSa1GLJQJl3m3Bb3dDj06i 9tP0nvxq0W0A/Lh82RkEnOyorck+4M974ibACpRxio72aE8aZm2Ql4uEFzyPhtnlJrk4 VIcw== X-Gm-Message-State: AOAM533COcv7VtUUNL63TJlmTSOh7QGN8OoNF4jBhfKRLAB2DpLV/ZSF uCqkY8+cyIPUKa3tv6q7Dv7T9w== X-Google-Smtp-Source: ABdhPJz5tCXujzY8OghCUBQNUBHDa22zyVcbaZ6BUO5ym91jHLtpezu5wFeJRQOAchTuClwI1F033A== X-Received: by 2002:a63:d114:: with SMTP id k20mr4198126pgg.75.1642220669870; Fri, 14 Jan 2022 20:24:29 -0800 (PST) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id q9sm5777743pgv.71.2022.01.14.20.24.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Jan 2022 20:24:29 -0800 (PST) From: Kees Cook To: Greg Kroah-Hartman Cc: Kees Cook , Larry Finger , Phillip Potter , Michael Straube , Fabio Aiuto , linux-staging@lists.linux.dev, Florian Schilhabel , Christophe JAILLET , Zhansaya Bagdauletkyzy , Ivan Safonov , Martin Kaiser , Yang Li , Nathan Chancellor , Hans de Goede , Dan Carpenter , Marco Cesati , Joe Perches , "Fabio M. De Francesco" , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH 1/3 v2] staging: r8188eu: Drop get_recvframe_data() Date: Fri, 14 Jan 2022 20:24:25 -0800 Message-Id: <20220115042427.824542-2-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220115042427.824542-1-keescook@chromium.org> References: <20220115042427.824542-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4934; h=from:subject; bh=91pfgNSNKQZ90Z5sOLt9nzmWsWo2UUEN0XKGD4U7vGE=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBh4kx6lQv2coVuKsjKL2V15ndg7Erkujlv2Soj3VY3 WBrgQfuJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYeJMegAKCRCJcvTf3G3AJv0xD/ 92Y3jbnr8L5D4H7cCfqWdvnWn/NXAJodrOeNxdk7ul/0rRz3EqIiZVoWUOpJ3pq0fQ+s87Wf+pCt3u ebrZiFUNQBMQvVLQOPZsuH93QLbMHK0heQuRM6ogcPNx3Q9FzCDJszz96ZEOrv2aqLmZJu8Z5FzGIa sVAn6r+vbNgmU/BmjefnN0RzUArx+gL6rBYRSnzg99cHhI6A1qw9b8VUfCgdoMxnRzPg67sbxcy3b1 zUwdhsxXS5HyLenfz9vUp3jxU2pDd0Mjba2njaWMdllw4h+KAm7u7AZEKYOB8IQlJuDYsdqAb3IZYy 8RaG9xNmBczKAy+kzccVKpw67WfHtrxMt4jqQXyTHpXQIVm37im+BNOKRfgWKv1ecJxQQDKKwWLjFy P0ysyE0vtPd035lKVYTEpqyeRhdLYJqMcsJrifdHtw09jyMbHvY1WNByaiuQNx0gy//DuJ16Catjdr I7BaJB0Y60TaSe1A2DZxavoy7hiUYd8fiI1egvTtjquDEEGBRYg685JnWmDv20JfNgqqeVZkCDqiIh aLlHB9oJ8VLOJEggpNZbNkBnWPEDfIZOR5pZx0N2Gubu2kQj+40PRI6Wd+aBl7IQaQm6NY5lcQFzK5 Ysnrr8OM78uiOjOYvzfOrApU+bmpXeKc6nVmm6vqJ5CjXlGUtJpsokZYMxlw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org When building with -Warray-bounds, the following warning is emitted: In file included from ./include/linux/string.h:253, from ./arch/x86/include/asm/page_32.h:22, from ./arch/x86/include/asm/page.h:14, from ./arch/x86/include/asm/thread_info.h:12, from ./include/linux/thread_info.h:60, from ./arch/x86/include/asm/preempt.h:7, from ./include/linux/preempt.h:78, from ./include/linux/rcupdate.h:27, from ./include/linux/rculist.h:11, from ./include/linux/sched/signal.h:5, from ./drivers/staging/rtl8723bs/include/drv_types.h:17, from drivers/staging/rtl8723bs/core/rtw_recv.c:7: In function 'memcpy', inlined from 'wlanhdr_to_ethhdr' at drivers/staging/rtl8723bs/core/rtw_recv.c:1554:2: ./include/linux/fortify-string.h:41:33: warning: '__builtin_memcpy' offset [0, 5] is out of the bounds [0, 0] [-Warray-bounds] 41 | #define __underlying_memcpy __builtin_memcpy | ^ This is because the compiler sees it is possible for "ptr" to be a NULL value, and concludes that it has zero size and attempts to copy to it would overflow. Instead, remove the get_recvframe_data() entirely, as it's not possible for this to ever be NULL. Additionally add missing NULL checks after recvframe_pull() (which are present in the rtl8712 driver). Cc: Larry Finger Cc: Phillip Potter Cc: Greg Kroah-Hartman Cc: Michael Straube Cc: Fabio Aiuto Cc: linux-staging@lists.linux.dev Signed-off-by: Kees Cook --- drivers/staging/r8188eu/core/rtw_recv.c | 6 +++++- drivers/staging/r8188eu/hal/rtl8188e_rxdesc.c | 4 +--- drivers/staging/r8188eu/include/rtw_recv.h | 9 --------- 3 files changed, 6 insertions(+), 13 deletions(-) diff --git a/drivers/staging/r8188eu/core/rtw_recv.c b/drivers/staging/r8188eu/core/rtw_recv.c index 51a13262a226..946e659ae97a 100644 --- a/drivers/staging/r8188eu/core/rtw_recv.c +++ b/drivers/staging/r8188eu/core/rtw_recv.c @@ -1188,7 +1188,7 @@ static int wlanhdr_to_ethhdr(struct recv_frame *precvframe) struct adapter *adapter = precvframe->adapter; struct mlme_priv *pmlmepriv = &adapter->mlmepriv; - u8 *ptr = get_recvframe_data(precvframe); /* point to frame_ctrl field */ + u8 *ptr = precvframe->rx_data; /* point to frame_ctrl field */ struct rx_pkt_attrib *pattrib = &precvframe->attrib; if (pattrib->encrypt) @@ -1223,10 +1223,14 @@ static int wlanhdr_to_ethhdr(struct recv_frame *precvframe) eth_type = 0x8712; /* append rx status for mp test packets */ ptr = recvframe_pull(precvframe, (rmv_len - sizeof(struct ethhdr) + 2) - 24); + if (!ptr) + return _FAIL; memcpy(ptr, get_rxmem(precvframe), 24); ptr += 24; } else { ptr = recvframe_pull(precvframe, (rmv_len - sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0))); + if (!ptr) + return _FAIL; } memcpy(ptr, pattrib->dst, ETH_ALEN); diff --git a/drivers/staging/r8188eu/hal/rtl8188e_rxdesc.c b/drivers/staging/r8188eu/hal/rtl8188e_rxdesc.c index 90d426199f52..bf93ff3af140 100644 --- a/drivers/staging/r8188eu/hal/rtl8188e_rxdesc.c +++ b/drivers/staging/r8188eu/hal/rtl8188e_rxdesc.c @@ -128,7 +128,7 @@ void update_recvframe_phyinfo_88e(struct recv_frame *precvframe, struct phy_stat struct rx_pkt_attrib *pattrib = &precvframe->attrib; struct hal_data_8188e *pHalData = &padapter->haldata; struct phy_info *pPHYInfo = &pattrib->phy_info; - u8 *wlanhdr; + u8 *wlanhdr = precvframe->rx_data; struct odm_per_pkt_info pkt_info; u8 *sa = NULL; struct sta_priv *pstapriv; @@ -138,8 +138,6 @@ void update_recvframe_phyinfo_88e(struct recv_frame *precvframe, struct phy_stat pkt_info.bPacketToSelf = false; pkt_info.bPacketBeacon = false; - wlanhdr = get_recvframe_data(precvframe); - pkt_info.bPacketMatchBSSID = ((!IsFrameTypeCtrl(wlanhdr)) && !pattrib->icv_err && !pattrib->crc_err && !memcmp(get_hdr_bssid(wlanhdr), diff --git a/drivers/staging/r8188eu/include/rtw_recv.h b/drivers/staging/r8188eu/include/rtw_recv.h index b43a46887343..920f33235e00 100644 --- a/drivers/staging/r8188eu/include/rtw_recv.h +++ b/drivers/staging/r8188eu/include/rtw_recv.h @@ -296,15 +296,6 @@ static inline u8 *get_rx_status(struct recv_frame *precvframe) return get_rxmem(precvframe); } -static inline u8 *get_recvframe_data(struct recv_frame *precvframe) -{ - /* always return rx_data */ - if (precvframe == NULL) - return NULL; - - return precvframe->rx_data; -} - static inline u8 *recvframe_push(struct recv_frame *precvframe, int sz) { /* append data before rx_data */