From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3CE614949E7 for ; Tue, 5 May 2026 21:13:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778015609; cv=none; b=Bv2oyQ77ufHjZfMWn+l0poNBMAs90FiHhmUamILAmHEhPbyCuQo9Dv1YxCQdT7nPO0mlqdjXCBVskkTRO/QrGI6s8938WwvLci33lOp63JVjWRwjeF+HXQyAkthEI1MCyHohh+m4Ud1sS6TFz4Ci5fdqV7LvnuHIBmBkHKmL0xk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778015609; c=relaxed/simple; bh=yeZk9yOeTk35adoPsJ72JURTsAZ9MYmWZqZL5l4j7yw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qMp1YyI6kBOqhVzayrjFjkT/qyBhhPt6MClukcZAUq5jMHz0JGxbTUXZairFsLmG0vFYWTUKxjhfp1f8r0L11c5dQGG7O+JONkymVMwjZUp5BHGEHPdCf3O437uRXJRKe/wEs3gxQ7MLnH2C/Y3g6YfohWT331UnK2s5z1vPIUE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=fb4l/Sts; arc=none smtp.client-ip=209.85.128.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fb4l/Sts" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-488b0e1b870so89430915e9.2 for ; Tue, 05 May 2026 14:13:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778015607; x=1778620407; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=3D1fo51a+Fqwvih6rAM0AOM8n9BMVTDWYpVR0qTGxW4=; b=fb4l/StslmsqnVs/TBjJhheYSqqJc+SMl8VCMXRwLW2mnv608bLdILWLhHoLN3iZ9W 2XjQmXQphTMct01lV2KsFp9wOEf8IcSSjBExdtbtywDKbVE9F6EZevUSK6/A3YRFd5CD Z3LaogPUlFIDEfHGSHrW6GVsU7XHAk+ZLzoiH2K8yGU5XvZAX5p2XqvZCifH5uf6n0xK rW4A3/zApDJVQvuqyT8WgdU8f54duL47p2DClyTluldLnW/k+Kl/75FIZg4k0Dv8/6lo kFGagudYkjtM00Fa0pWaAfuMWH5Az+Sp6m1RsOdagHCDReI6wpNfe+LG6EFdDQ7tHCuc Ndzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778015607; x=1778620407; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=3D1fo51a+Fqwvih6rAM0AOM8n9BMVTDWYpVR0qTGxW4=; b=etBPf4x6e4noCyxrRkUy9OFnWHdfBlkDPaqW1GcZXwWEmJXwpkCh1+FJ/i534jUTzA VjzM/kUUBVeUO2BS4MN5hFXPn8X09RwEEmoLpEVA8GH2vuQh8aWTHu35TKZkqVDmqhif RPahCs8cTgGXV9sF9t8I8mkoJ02Bm1F+LbZCBx14KKkJV9LZAcOHQbPc8pK8D6bfdLbb DLmqCyWcedSfmz5Aq6DUTZpgVzyhNWyysPz4fiiQoj7sVTA8ijog8224cIE1kibFZCmS 4KT9l6veT8rQU6SmzMGu5ZDy8KGHg0eRsFsAfMES3eJBE/R7Z2Z6cr5DSoyEOAI3U3qn M1dg== X-Forwarded-Encrypted: i=1; AFNElJ/1W3AEeCI5nTg4994CRtGW4tftia/lusWLs9xLFpRmEMVmSLa/rkzojv7bTntchZHQKhYu63k=@vger.kernel.org X-Gm-Message-State: AOJu0Ywb5/Kzwvjai901boheReflTnxE1a5o+nkBlw8kESNcCRUzV5da kt5iKdoATrbV5JlOdWQJzlaZiNiCbsbHUvfllbkEZq4HhyZoDhNcTO1V X-Gm-Gg: AeBDieuz5bYvLuxhu/hbv+80kazDbuMJOO+h89n5xWMEF9t6866Lr9uU79xftyZUgv/ s6GwRMsQDA79X46FnY5Jzz0YYdmbviZ1l7FrOPOtbqncYz0YaUB+9jFIyGhJ/ktPgjL9ZEBTrtu 5Es5Vd7V3M0TkYxR+2STSsz0iV5LeyCXQGa3aL2ZcKdpZgo+1Q1PtQID48cYTOFIP57jHuhP0lq q1RaI0D4nVjgbrSkBUZPndIRtH2cQ1sHFiQ/cvQxew6FmBhb5HGfNsrl1QtKgs6M6iWzKMtcpGx 9gpuMHNKOkRB8K7c9Q9nKWtTlrDRLcXA8WqYyasQ3/6/BHp7tHZeyb5L0roQym4M6HRUnnDzqg2 GGbRBuGWHJM3/JHSBV7TnE5+2cpgTLNWtLAheh74eYE/3JenWZvKwjoHnve+SiwGfAywmut4vlW b/bHVpWid7WgWSnyxbM8NeqIeEeOOUU9EuIDaz+aApFE7vXtvErHTysSmiHc/Tb8DN6Axpys0s0 Go/6EO38nj9VzoHHfxQrLydjoNP28qzv0/NEYX5GF5ffrQUoWLLBRmiX2GERcJoPSUYXzI= X-Received: by 2002:a05:600c:b8a:b0:48a:5574:3a48 with SMTP id 5b1f17b1804b1-48e51f32bf7mr12038625e9.16.1778015606400; Tue, 05 May 2026 14:13:26 -0700 (PDT) Received: from ahossu.localdomain ([82.78.232.184]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a8eb6fffcsm403400045e9.4.2026.05.05.14.13.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2026 14:13:25 -0700 (PDT) From: Alexandru Hossu To: gregkh@linuxfoundation.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Cc: error27@gmail.com, stable@vger.kernel.org, luka.gejak@linux.dev, hansg@kernel.org, Alexandru Hossu Subject: [PATCH v7 2/2] staging: rtl8723bs: fix missing frame length checks in OnAuth() and OnAuthClient() Date: Tue, 5 May 2026 23:13:16 +0200 Message-ID: <20260505211316.3837020-3-hossu.alexandru@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260505211316.3837020-1-hossu.alexandru@gmail.com> References: <2026050453-scorer-rebate-3898@gregkh> <20260505211316.3837020-1-hossu.alexandru@gmail.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Four out-of-bounds read paths caused by missing frame length guards: 1. OnAuth() reads GetAddr2Ptr (pframe + 10) without verifying the frame is at least WLAN_HDR_A3_LEN bytes long. The first operation on pframe after the AP-state guard is GetAddr2Ptr(pframe), which reads 6 bytes at offset 10..15 (Addr2). If the received frame is shorter than WLAN_HDR_A3_LEN (24 bytes), this reads past the end of the frame buffer. Add: if (len < WLAN_HDR_A3_LEN) goto auth_fail; 2. OnAuth() reads the algorithm and sequence fields at pframe + WLAN_HDR_A3_LEN + offset + {0,2} without verifying that those offsets are within the frame. offset is 0 for an open-system frame and 4 for a WEP-encapsulated frame. The reads at offset+0 and offset+2 are both 2-byte, so the last byte accessed is at WLAN_HDR_A3_LEN + offset + 3. A crafted short frame causes an out-of-bounds read. Add: if (len < WLAN_HDR_A3_LEN + offset + 4) goto auth_fail; 3. OnAuthClient() calls get_da(pframe) without verifying the frame is at least WLAN_HDR_A3_LEN bytes long. get_da() inspects the ToDs and FrDs bits in Frame Control (bytes 0..1) and returns either Addr1 (bytes 4..9) or Addr3 (bytes 16..21). A frame shorter than WLAN_HDR_A3_LEN (24 bytes) causes an out-of-bounds read in either case. Add: if (pkt_len < WLAN_HDR_A3_LEN) goto authclnt_fail; 4. OnAuthClient() reads the sequence field at pframe + WLAN_HDR_A3_LEN + offset + 2 and the status field at offset + 4 without verifying those offsets are within the frame. offset is 0 for open-system and 4 for WEP. The status read at offset+4 is 2 bytes, so the last byte accessed is at WLAN_HDR_A3_LEN + offset + 5. Add: if (pkt_len < WLAN_HDR_A3_LEN + offset + 6) goto authclnt_fail; Note: a previous version of this patch claimed that the signed/unsigned mismatch in the rtw_get_ie() limit parameter caused an out-of-bounds scan when pkt_len < WLAN_HDR_A3_LEN + _AUTH_IE_OFFSET_. This is incorrect: rtw_get_ie() declares its limit as signed int, so the wrapped unsigned value is reinterpreted as a large negative number, which is immediately caught by the if (limit < 2) return NULL; guard inside rtw_get_ie(). The actual out-of-bounds reads are the four direct pframe dereferences listed above. OnAssocRsp() was already fixed by a separate series. Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver") Cc: stable@vger.kernel.org Signed-off-by: Alexandru Hossu --- Changes in v7: - Add frame length checks for OnAuth(): guard before GetAddr2Ptr (len < WLAN_HDR_A3_LEN) and guard before algorithm/seq reads (len < WLAN_HDR_A3_LEN + offset + 4) (sashiko review of v6). - Correct commit message: remove incorrect claim that rtw_get_ie() unsigned underflow causes OOB scan; rtw_get_ie() uses signed int limit and returns NULL when limit < 2 (sashiko review of v6). Changes in v6: - Add frame length checks for OnAuthClient(): guard before get_da() (pkt_len < WLAN_HDR_A3_LEN) and guard before seq/status reads (pkt_len < WLAN_HDR_A3_LEN + offset + 6). - Correct commit message: OnAssocRsp() was already fixed in a separate series. drivers/staging/rtl8723bs/core/rtw_mlme_ext.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c index dd3c94d314d8..b42eab61d8a8 100644 --- a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c +++ b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c @@ -687,6 +687,9 @@ unsigned int OnAuth(struct adapter *padapter, union recv_frame *precv_frame) if ((pmlmeinfo->state&0x03) != WIFI_FW_AP_STATE) return _FAIL; + if (len < WLAN_HDR_A3_LEN) + goto auth_fail; + sa = GetAddr2Ptr(pframe); auth_mode = psecuritypriv->dot11AuthAlgrthm; @@ -709,6 +712,9 @@ unsigned int OnAuth(struct adapter *padapter, union recv_frame *precv_frame) offset = 4; } + if (len < WLAN_HDR_A3_LEN + offset + 4) + goto auth_fail; + algorithm = le16_to_cpu(*(__le16 *)((SIZE_PTR)pframe + WLAN_HDR_A3_LEN + offset)); seq = le16_to_cpu(*(__le16 *)((SIZE_PTR)pframe + WLAN_HDR_A3_LEN + offset + 2)); @@ -860,6 +866,9 @@ unsigned int OnAuthClient(struct adapter *padapter, union recv_frame *precv_fram u8 *pframe = precv_frame->u.hdr.rx_data; uint pkt_len = precv_frame->u.hdr.len; + if (pkt_len < WLAN_HDR_A3_LEN) + goto authclnt_fail; + /* check A1 matches or not */ if (memcmp(myid(&(padapter->eeprompriv)), get_da(pframe), ETH_ALEN)) return _SUCCESS; @@ -869,6 +878,9 @@ unsigned int OnAuthClient(struct adapter *padapter, union recv_frame *precv_fram offset = (GetPrivacy(pframe)) ? 4 : 0; + if (pkt_len < WLAN_HDR_A3_LEN + offset + 6) + goto authclnt_fail; + seq = le16_to_cpu(*(__le16 *)((SIZE_PTR)pframe + WLAN_HDR_A3_LEN + offset + 2)); status = le16_to_cpu(*(__le16 *)((SIZE_PTR)pframe + WLAN_HDR_A3_LEN + offset + 4)); -- 2.53.0