From nobody Fri Dec 19 17:33:00 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 730E5C32771 for ; Mon, 26 Sep 2022 11:26:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237931AbiIZL0z (ORCPT ); Mon, 26 Sep 2022 07:26:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235083AbiIZL0N (ORCPT ); Mon, 26 Sep 2022 07:26:13 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32F98696EE; Mon, 26 Sep 2022 03:40:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id E5103B80957; Mon, 26 Sep 2022 10:39:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B0F7C433D6; Mon, 26 Sep 2022 10:39:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1664188797; bh=A4gIVXUxYJ5zkKGUSkpCXLj+wLMcU3okfja/CbaRkmM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B3SR1NI0GIWrdjRcBdn/6fAYg9WKese0JvJGILWDyoYkZpDRfkHnIB1XKvR+NQ9Vv Eie+cVKuJgo0JfBuh3Q6rINz0h9iP9W/kjcVoHZM1TJLuNi4qkO7D+g9UOmXQWGxCo LTtdtVAWJiDsmhLaI9gRdA96QU5yeOUHmTv3vN+4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Norbert Zulinski , Mateusz Palczewski , Konrad Jankowski , Tony Nguyen , Sasha Levin Subject: [PATCH 5.15 083/148] iavf: Fix bad page state Date: Mon, 26 Sep 2022 12:11:57 +0200 Message-Id: <20220926100759.149669924@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220926100756.074519146@linuxfoundation.org> References: <20220926100756.074519146@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Norbert Zulinski [ Upstream commit 66039eb9015eee4f7ff0c99b83c65c7ecb3c8190 ] Fix bad page state, free inappropriate page in handling dummy descriptor. iavf_build_skb now has to check not only if rx_buffer is NULL but also if size is zero, same thing in iavf_clean_rx_irq. Without this patch driver would free page that will be used by napi_build_skb. Fixes: a9f49e006030 ("iavf: Fix handling of dummy receive descriptors") Signed-off-by: Norbert Zulinski Signed-off-by: Mateusz Palczewski Tested-by: Konrad Jankowski Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/iavf/iavf_txrx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethe= rnet/intel/iavf/iavf_txrx.c index a99d5db15406..e76e3df3e2d9 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c +++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c @@ -1358,7 +1358,7 @@ static struct sk_buff *iavf_build_skb(struct iavf_rin= g *rx_ring, #endif struct sk_buff *skb; =20 - if (!rx_buffer) + if (!rx_buffer || !size) return NULL; /* prefetch first cache line of first page */ va =3D page_address(rx_buffer->page) + rx_buffer->page_offset; @@ -1516,7 +1516,7 @@ static int iavf_clean_rx_irq(struct iavf_ring *rx_rin= g, int budget) /* exit if we failed to retrieve a buffer */ if (!skb) { rx_ring->rx_stats.alloc_buff_failed++; - if (rx_buffer) + if (rx_buffer && size) rx_buffer->pagecnt_bias++; break; } --=20 2.35.1