From patchwork Mon May 31 13:14:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 451070 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05475C47083 for ; Mon, 31 May 2021 14:09:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF17B61375 for ; Mon, 31 May 2021 14:09:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232185AbhEaOKr (ORCPT ); Mon, 31 May 2021 10:10:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:40258 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232244AbhEaOHg (ORCPT ); Mon, 31 May 2021 10:07:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 248186140A; Mon, 31 May 2021 13:39:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1622468372; bh=vf2R1pwzOzf+f1ro2bIxCj3uHCxoj+ts+iVokRCQiOk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Mxe3u8JPKX6bC7D9ODe2FxuRGZL4jH21YpWbx2zZ0KRBw/pGTdMwoEP03X6ysLgH6 w2RxVsXBd0n7krXSqFzZqB99Ur1hujn8VTzJ1QSYAv2brDK1jRbrMDJWs21uaEeJ/f +8LIDfBVMJr7j0Pxcle+5UVxyeERIzAUTMDj6b6k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, David Awogbemila , Willem de Brujin , "David S. Miller" , Sasha Levin Subject: [PATCH 5.10 218/252] gve: Add NULL pointer checks when freeing irqs. Date: Mon, 31 May 2021 15:14:43 +0200 Message-Id: <20210531130705.417386172@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531130657.971257589@linuxfoundation.org> References: <20210531130657.971257589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: David Awogbemila [ Upstream commit 5218e919c8d06279884aa0baf76778a6817d5b93 ] When freeing notification blocks, we index priv->msix_vectors. If we failed to allocate priv->msix_vectors (see abort_with_msix_vectors) this could lead to a NULL pointer dereference if the driver is unloaded. Fixes: 893ce44df565 ("gve: Add basic driver framework for Compute Engine Virtual NIC") Signed-off-by: David Awogbemila Acked-by: Willem de Brujin Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/google/gve/gve_main.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c index a8fcf1227391..839102ea6aa1 100644 --- a/drivers/net/ethernet/google/gve/gve_main.c +++ b/drivers/net/ethernet/google/gve/gve_main.c @@ -301,20 +301,22 @@ static void gve_free_notify_blocks(struct gve_priv *priv) { int i; - /* Free the irqs */ - for (i = 0; i < priv->num_ntfy_blks; i++) { - struct gve_notify_block *block = &priv->ntfy_blocks[i]; - int msix_idx = i; - - irq_set_affinity_hint(priv->msix_vectors[msix_idx].vector, - NULL); - free_irq(priv->msix_vectors[msix_idx].vector, block); + if (priv->msix_vectors) { + /* Free the irqs */ + for (i = 0; i < priv->num_ntfy_blks; i++) { + struct gve_notify_block *block = &priv->ntfy_blocks[i]; + int msix_idx = i; + + irq_set_affinity_hint(priv->msix_vectors[msix_idx].vector, + NULL); + free_irq(priv->msix_vectors[msix_idx].vector, block); + } + free_irq(priv->msix_vectors[priv->mgmt_msix_idx].vector, priv); } dma_free_coherent(&priv->pdev->dev, priv->num_ntfy_blks * sizeof(*priv->ntfy_blocks), priv->ntfy_blocks, priv->ntfy_block_bus); priv->ntfy_blocks = NULL; - free_irq(priv->msix_vectors[priv->mgmt_msix_idx].vector, priv); pci_disable_msix(priv->pdev); kvfree(priv->msix_vectors); priv->msix_vectors = NULL;