From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C903400DE8; Thu, 16 Jul 2026 14:05:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784210740; cv=none; b=tW5fQgi42nZ28q+zPJprm8Kg1++JBWDqsUBgUhwZ3aOFkdUGXogy3+TXti3d4XHsvFPM3lImElVlRjQY1ir0UgbDn9ax6a5f+mrJ3q1+WoecUjDNtFg5zgmpdTgEjkrNMSh5SbHrKVB3+H558oEx5oyBpK4CaEzWz0UcKJ3XS14= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784210740; c=relaxed/simple; bh=CXbNArZNxAU8+C08IiUs68GjPJaJu3yKYaD/YAQ/3eE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RHulEsGTbQRuzOnnalqyBxNsUMp0k5TRSesaJ7HLLR52ys1aozaylre85Y2PWvd8V7mXVK9RiEuCu1WOvvFaDIAu+J+J4rMZo8BGFwvTYR2kxIrTELJWZtzNZsQqfAMCvaLs0J5EjYC+gKFVGaimrxaKFOUpb/ADyThF8baQ6MQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NAElJpBN; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="NAElJpBN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0CF451F000E9; Thu, 16 Jul 2026 14:05:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784210739; bh=cHVvRCdgSFsciYvPa1b5gK3W2KJObEbswB32GirWODs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=NAElJpBN0qwjkkawJDrFqJyZqX5OgND6wzsEAIYdw/kVdrGzMyE1a4H7X04f+r9f6 VJDwoXTDq7VQF41LxScOtv8GewwIkkVDBwUJTCalVT4XJXPftCiENrVWPAabaX0tcY vpofn+MXDWqr0xjvN9DdsV6yKkOzWpcO0JbVE8qU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Luka Gejak , Alexandru Hossu Subject: [PATCH 6.18 162/480] staging: rtl8723bs: fix heap buffer overflow in rtw_cfg80211_set_wpa_ie() Date: Thu, 16 Jul 2026 15:28:29 +0200 Message-ID: <20260716133048.215062290@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133044.672218725@linuxfoundation.org> References: <20260716133044.672218725@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexandru Hossu commit 5a752a616e756844388a1a45404db9fc29fec655 upstream. supplicant_ie is a 256-byte array in struct security_priv. The WPA and WPA2 IE copy paths use: memcpy(padapter->securitypriv.supplicant_ie, &pwpa[0], wpa_ielen + 2); where wpa_ielen is the raw IE length field (u8, 0-255). When a local user supplies a connect request via nl80211 with a crafted WPA IE of length 255, wpa_ielen + 2 equals 257, overflowing the 256-byte buffer by one byte into the adjacent last_mic_err_time field. rtw_parse_wpa_ie() does not prevent this: its length consistency check compares *(wpa_ie+1) against (u8)(wpa_ie_len-2), which is (u8)(255) == 255 when wpa_ie_len = 257, so the check passes silently. Add explicit bounds checks for both the WPA and WPA2 paths before the memcpy, rejecting any IE whose total size (wpa_ielen + 2) exceeds the supplicant_ie buffer. Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver") Cc: stable Reviewed-by: Luka Gejak Signed-off-by: Alexandru Hossu Link: https://patch.msgid.link/20260522004531.1038924-4-hossu.alexandru@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c @@ -1446,6 +1446,10 @@ static int rtw_cfg80211_set_wpa_ie(struc pwpa = rtw_get_wpa_ie(buf, &wpa_ielen, ielen); if (pwpa && wpa_ielen > 0) { + if (wpa_ielen + 2 > sizeof(padapter->securitypriv.supplicant_ie)) { + ret = -EINVAL; + goto exit; + } if (rtw_parse_wpa_ie(pwpa, wpa_ielen + 2, &group_cipher, &pairwise_cipher, NULL) == _SUCCESS) { padapter->securitypriv.dot11AuthAlgrthm = dot11AuthAlgrthm_8021X; padapter->securitypriv.ndisauthtype = Ndis802_11AuthModeWPAPSK; @@ -1455,6 +1459,10 @@ static int rtw_cfg80211_set_wpa_ie(struc pwpa2 = rtw_get_wpa2_ie(buf, &wpa2_ielen, ielen); if (pwpa2 && wpa2_ielen > 0) { + if (wpa2_ielen + 2 > sizeof(padapter->securitypriv.supplicant_ie)) { + ret = -EINVAL; + goto exit; + } if (rtw_parse_wpa2_ie(pwpa2, wpa2_ielen + 2, &group_cipher, &pairwise_cipher, NULL) == _SUCCESS) { padapter->securitypriv.dot11AuthAlgrthm = dot11AuthAlgrthm_8021X; padapter->securitypriv.ndisauthtype = Ndis802_11AuthModeWPA2PSK;