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 D5C4E28ED for ; Mon, 12 Dec 2022 13:53:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 186A5C433EF; Mon, 12 Dec 2022 13:53:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670853197; bh=toUeLpxLbmIbjp30Nnalr52fCO6gGBwfKqxsbRBC3KA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rYZmDQMX6Gn4GpAW6XzrLyPCIqqN1i2PgnHEL+WGJn5D5kt0/+WjlXOwFPShZGCyb nQvoQyDnEuSYa6JkLhzAbVlukjH4MFmK/QoJc70Gf/Q3mvW2YAly7DkGLRnvc5ADkl o5Igh/1oEI/8BqFPHtNqyezXopRujndsJ059nudQ= 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 4.14 31/38] net: hisilicon: Fix potential use-after-free in hisi_femac_rx() Date: Mon, 12 Dec 2022 14:19:32 +0100 Message-Id: <20221212130913.654380080@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221212130912.069170932@linuxfoundation.org> References: <20221212130912.069170932@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 2c2808830e95..f29040520ca0 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