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 1DA4F3AF647; Sat, 12 Sep 2026 18:22:47 +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=1789237368; cv=none; b=pw2GwWZ88DetXVweDRZkbRmkSn+krekCuTnvtTcEcv5S6YI360R4GsMlHMedKxMV09GIRpK8g+/J/cO3UZrIxpEqJcZaQuIQOHKMHLYoYt5E1ZTPMkLB/rX9sf/48NikZqrHAO3mlmatgPD0UeiW80ImnGcY3Ny5ThqalwCagJQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789237368; c=relaxed/simple; bh=7ZNEesjKPPSzIfA3n/NFzAEjaavXlLh4JMQ95jPghEo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Na/E5c/+RA/waOz01wDLTpXszlXXZz7Y1xX46F1YwQ+qEArVEF6AAejA7wXf10T6+UCdCeKW9/i9LVRA3FnLHDHuNlhTRPV87eRooPg/SUN8XvUAnHzdzdBELLI9kG9VP4qIvNiMr6tEO/xk9hyJHdWNtHFOYGZ3SQGDe7hynno= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HHyb5JGS; 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="HHyb5JGS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B93751F0089A; Sat, 12 Sep 2026 18:22:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789237366; bh=oQmqag/fgQfyZH/l9oQGDlsB1CVy1lEHAaecQYxfR/E=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=HHyb5JGS3USON+t+qH1alt/JchxnISiM9t/0Xy9ic8pZH/jqbypVX3p8//1ltWOLg +aZ8cumrAR9qj7+45goM8BdosyV2YBx9gb3JpNUOoDWz+lE/gIkvd0zHLTA9Y9WVS1 RFZamWI6LleaQ+cbKSoR6xtvPEjXaDdjVtXUoLN0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Muhammad Bilal Subject: [PATCH 5.15 243/935] staging: rtl8723bs: fix OOB read / stack overflow in rtw_get_wps_attr() Date: Sat, 12 Sep 2026 08:54:33 +0200 Message-ID: <20260912065532.398345874@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Muhammad Bilal commit 99aa998dec83ba180822f70e6d48a514fc81c20d upstream. rtw_get_wps_attr() walks WPS attributes inside a WPS IE taken from a wireless management frame. For each candidate attribute it only checks that the fixed 4-byte attribute header (2-byte ID + 2-byte length) fits inside the IE: if (attr_ptr + 4 > wps_ie + wps_ielen) break; u16 attr_id = get_unaligned_be16(attr_ptr); u16 attr_data_len = get_unaligned_be16(attr_ptr + 2); u16 attr_len = attr_data_len + 4; attr_data_len (and therefore attr_len) is read directly from the wire and is never checked against the remaining bytes in the IE before being used as the size of: memcpy(buf_attr, attr_ptr, attr_len); Since attr_len is fully attacker controlled (0 to 65535+4), this is both a heap OOB read of wps_ie, and, more seriously, a stack buffer overflow at several call sites where buf_attr is a single-byte stack variable, e.g. rtw_get_wps_attr_content()'s callers passing WPS_ATTR_SELECTED_REGISTRAR into a stack "u8 sr"/"u8 selected_registrar" (drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c, drivers/staging/rtl8723bs/core/rtw_mlme_ext.c). A crafted WPS IE in a beacon or probe response processed during scanning can therefore smash the stack of the parsing thread. rtw_get_wps_attr_content() itself has no independent length check and simply trusts the attr_len it gets back from rtw_get_wps_attr(), so fixing the bound here also fixes that caller. The "attr_ptr + 4 > wps_ie + wps_ielen" header check above was added by commit 1463ca3ec6601 ("staging: rtl8723bs: fix OOB reads in rtw_get_sec_ie(), rtw_get_wapi_ie(), and rtw_get_wps_attr()"), which bounded the fixed header but never extended the check to cover the variable-length attribute data that follows it. Add that missing check before attr_len is used as a memcpy() length or accepted as a match. Fixes: 554c0a3abf216 ("staging: Add rtl8723bs sdio wifi driver") Cc: stable@vger.kernel.org Signed-off-by: Muhammad Bilal Link: https://patch.msgid.link/20260728125456.32359-2-meatuni001@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8723bs/core/rtw_ieee80211.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/staging/rtl8723bs/core/rtw_ieee80211.c +++ b/drivers/staging/rtl8723bs/core/rtw_ieee80211.c @@ -762,6 +762,10 @@ u8 *rtw_get_wps_attr(u8 *wps_ie, uint wp if (attr_ptr + 4 > wps_ie + wps_ielen) break; + /* Reject attributes whose claimed length runs past the IE */ + if (attr_ptr + attr_len > wps_ie + wps_ielen) + break; + if (attr_id == target_attr_id) { target_attr_ptr = attr_ptr;