From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 C866F6FA0 for ; Mon, 16 Jan 2023 17:08:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4ED20C433D2; Mon, 16 Jan 2023 17:08:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673888906; bh=EisQoTkT/fo8eqjMDoPsX1aX2ZPh1PToLWpozWmqpXA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F/T02DtBH1zWyoCYPnaXgd8njuaIysT4UvzV7fRjEJGiGTSwuAQ0oZlX0iNWH23V9 8RpTgxr1ARR8TGlo/WpeltXzBIfDoo1l25LE3V6ar/7trkoIMcFzflyFP/ux25OuXI Qli72Tsw9bZZMnUrHhw9jUUEHZTNC5VQjGtkcWcA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, YueHaibing , Sasha Levin Subject: [PATCH 4.14 177/338] staging: rtl8192e: Fix potential use-after-free in rtllib_rx_Monitor() Date: Mon, 16 Jan 2023 16:50:50 +0100 Message-Id: <20230116154828.628400077@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154820.689115727@linuxfoundation.org> References: <20230116154820.689115727@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: YueHaibing [ Upstream commit d30f4436f364b4ad915ca2c09be07cd0f93ceb44 ] The skb is delivered to netif_rx() in rtllib_monitor_rx(), which may free it, after calling this, dereferencing skb may trigger use-after-free. Found by Smatch. Fixes: 94a799425eee ("From: wlanfae [PATCH 1/8] rtl8192e: Import new version of driver from realtek") Signed-off-by: YueHaibing Link: https://lore.kernel.org/r/20221123081253.22296-1-yuehaibing@huawei.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/rtl8192e/rtllib_rx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/rtl8192e/rtllib_rx.c b/drivers/staging/rtl8192e/rtllib_rx.c index 171009e82137..85a71b09fcba 100644 --- a/drivers/staging/rtl8192e/rtllib_rx.c +++ b/drivers/staging/rtl8192e/rtllib_rx.c @@ -1501,9 +1501,9 @@ static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb, hdrlen += 4; } - rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen); ieee->stats.rx_packets++; ieee->stats.rx_bytes += skb->len; + rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen); return 1; } -- 2.35.1