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 CA0FD43FD1E; Tue, 21 Jul 2026 21:57:14 +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=1784671038; cv=none; b=S57L93lJayRone9AxXPetmzNWQC5Xbkj+g4WQ6WMAclvd/p0m07nOf0WkDn12T4s1ZCKQ3NklyOq091CTfk/2fZ31vHf1HgOuBy6sMlWao00wXdud7dXX3ceA7oEknHdD34/qa5rQLIkZ97qjPf4ciQ4RPtNR2XkbRf0ZQO/3PQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671038; c=relaxed/simple; bh=FHtGoIJOaRiqmTIACXZbBOEvKyyuuSHQ1RWQQ3UNq70=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GNhDO9sQUPrkHHPhpV1ByNjk8YjlR4vf0AuKLAkk4g9Dzm3LvIG+UcoIshfYd9XBOh9c6jKiaQ2kvvS3aLVJGybY7m9VhH56Ereu8SknQkMxIjkirU4Ocor9m3FsMV8swoiYbsi2nbDWMRiqMGCGnMn/wnneYAWjFcxTfp7ZlJI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rVuNhZCx; 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="rVuNhZCx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3A0791F000E9; Tue, 21 Jul 2026 21:57:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671034; bh=HSYQWRC48TjGjoN2lS+JkXLzfcaa9icyNSI407hK1B4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rVuNhZCxWrAQzAfWaZSQxWeOOJEWu2EYWtDwLysOiSQGbaFgAgCbvZ3QIJHWBWvhy C34Tt0FQN7fYmOt0EOvxvrUOgtrGiv/T1PlBjLKVUxj83dGjLPV4SLQRdPgi78m0Xn 5mrc24Ns5w4dXRAF9meVC5HRInVGkzs2kkCqpO18= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Luka Gejak , Alexandru Hossu Subject: [PATCH 5.15 095/843] staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop Date: Tue, 21 Jul 2026 17:15:30 +0200 Message-ID: <20260721152408.135971200@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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: Alexandru Hossu commit ed51de4a86e173c3b0ef78e039c2e49e08b11f16 upstream. The IE parsing loop in update_beacon_info() advances by (pIE->length + 2) each iteration but only guards on i < len. When a malicious AP sends a Beacon whose last IE has only one byte remaining in the frame (the element_id byte lands at len-1), the loop reads pIE->length from one byte past the allocated receive buffer. Additionally, even when the header bytes are in bounds, pIE->length itself can extend the data window beyond len, passing a truncated IE to the handler functions. Add two guards at the top of the loop body: 1. Break if fewer than sizeof(*pIE) bytes remain (can't read header). 2. Break if the IE's declared data extends past len. Also replace i += (pIE->length + 2) with i += sizeof(*pIE) + pIE->length for consistency with the sizeof(*pIE) guards added above. Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver") Cc: stable Reviewed-by: Luka Gejak Signed-off-by: Alexandru Hossu Link: https://patch.msgid.link/20260522004531.1038924-2-hossu.alexandru@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8723bs/core/rtw_wlan_util.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/staging/rtl8723bs/core/rtw_wlan_util.c +++ b/drivers/staging/rtl8723bs/core/rtw_wlan_util.c @@ -1336,7 +1336,11 @@ void update_beacon_info(struct adapter * len = pkt_len - (_BEACON_IE_OFFSET_ + WLAN_HDR_A3_LEN); for (i = 0; i < len;) { + if (i + sizeof(*pIE) > len) + break; pIE = (struct ndis_80211_var_ie *)(pframe + (_BEACON_IE_OFFSET_ + WLAN_HDR_A3_LEN) + i); + if (i + sizeof(*pIE) + pIE->length > len) + break; switch (pIE->element_id) { case WLAN_EID_VENDOR_SPECIFIC: @@ -1361,7 +1365,7 @@ void update_beacon_info(struct adapter * break; } - i += (pIE->length + 2); + i += sizeof(*pIE) + pIE->length; } }