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 3C00D28ED for ; Mon, 12 Dec 2022 13:55:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8DF11C433EF; Mon, 12 Dec 2022 13:55:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670853331; bh=CMf3mJoiiDYjSUMlxcs4bX65b1IFunj0Vs48ipWViO8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=o4pr+UHcabSG9b05wsES3bmWnwFM0dNhqOEYOVc3mfuWYmQxC+bATmrv3SyooUsLQ YitnjFynox8nHfmukGIaTkfmQc/+PaMvAnZj+HWGRp2TV6uWIJM+U8D3tQRKWGoSQ7 OuC6IEtscVctbpSEyzLtzU8UqTg6TK35so+fSR1I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Liu Jian , Paolo Abeni , Sasha Levin Subject: [PATCH 4.9 25/31] net: hisilicon: Fix potential use-after-free in hisi_femac_rx() Date: Mon, 12 Dec 2022 14:19:43 +0100 Message-Id: <20221212130911.380256159@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221212130909.943483205@linuxfoundation.org> References: <20221212130909.943483205@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: Liu Jian [ Upstream commit 4640177049549de1a43e9bc49265f0cdfce08cfd ] The skb is delivered to napi_gro_receive() which may free it, after calling this, dereferencing skb may trigger use-after-free. Fixes: 542ae60af24f ("net: hisilicon: Add Fast Ethernet MAC driver") Signed-off-by: Liu Jian Link: https://lore.kernel.org/r/20221203094240.1240211-1-liujian56@huawei.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/ethernet/hisilicon/hisi_femac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/hisilicon/hisi_femac.c b/drivers/net/ethernet/hisilicon/hisi_femac.c index ced185962ef8..77f61167e238 100644 --- a/drivers/net/ethernet/hisilicon/hisi_femac.c +++ b/drivers/net/ethernet/hisilicon/hisi_femac.c @@ -295,7 +295,7 @@ static int hisi_femac_rx(struct net_device *dev, int limit) skb->protocol = eth_type_trans(skb, dev); napi_gro_receive(&priv->napi, skb); dev->stats.rx_packets++; - dev->stats.rx_bytes += skb->len; + dev->stats.rx_bytes += len; next: pos = (pos + 1) % rxq->num; if (rx_pkts_num >= limit) -- 2.35.1