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[23.128.96.18]) by mx.google.com with ESMTP id p22si789690ejm.148.2021.04.28.11.31.37; Wed, 28 Apr 2021 11:32:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=DhLBMGBB; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238485AbhD1Og7 (ORCPT + 99 others); Wed, 28 Apr 2021 10:36:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:53822 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235864AbhD1Og6 (ORCPT ); Wed, 28 Apr 2021 10:36:58 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5C1976143E; Wed, 28 Apr 2021 14:36:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1619620573; bh=xXLfHLEkPPw+BpHVObwqLRh2LCVht6DaSQKFZT8ytBI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DhLBMGBB3x1KK8EZc6W4RH0pd4l0VNULE78vFjrlA3zMYHrofSJ8Q427hhnI2VJx9 GadCiFfViyUnKrVEht0qeGxesW/Y1SqXOm4ro1BK7ksvy6mTQwJATwE6EAZqrp7l3K 0lG9VxkkVPHJXVupY1cC1rhtg+GjjEPoTTJ08gZA= Date: Wed, 28 Apr 2021 16:36:11 +0200 From: Greg Kroah-Hartman To: Russell King - ARM Linux admin Cc: linux-kernel@vger.kernel.org, Kangjie Lu , "David S . Miller" Subject: Re: [PATCH 131/190] Revert "net: 8390: fix potential NULL pointer dereferences" Message-ID: References: <20210421130105.1226686-1-gregkh@linuxfoundation.org> <20210421130105.1226686-132-gregkh@linuxfoundation.org> <20210428100844.GA20947@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210428100844.GA20947@shell.armlinux.org.uk> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 28, 2021 at 11:08:47AM +0100, Russell King - ARM Linux admin wrote: > On Tue, Apr 27, 2021 at 08:34:26PM +0200, Greg Kroah-Hartman wrote: > > On Wed, Apr 21, 2021 at 03:00:06PM +0200, Greg Kroah-Hartman wrote: > > > This reverts commit c7cbc3e937b885c9394bf9d0ca21ceb75c2ac262. > > > > > > Commits from @umn.edu addresses have been found to be submitted in "bad > > > faith" to try to test the kernel community's ability to review "known > > > malicious" changes. The result of these submissions can be found in a > > > paper published at the 42nd IEEE Symposium on Security and Privacy > > > entitled, "Open Source Insecurity: Stealthily Introducing > > > Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University > > > of Minnesota) and Kangjie Lu (University of Minnesota). > > > > > > Because of this, all submissions from this group must be reverted from > > > the kernel tree and will need to be re-reviewed again to determine if > > > they actually are a valid fix. Until that work is complete, remove this > > > change to ensure that no problems are being introduced into the > > > codebase. > > > > > > Cc: Kangjie Lu > > > Cc: David S. Miller > > > Signed-off-by: Greg Kroah-Hartman > > > --- > > > drivers/net/ethernet/8390/pcnet_cs.c | 10 ---------- > > > 1 file changed, 10 deletions(-) > > > > > > diff --git a/drivers/net/ethernet/8390/pcnet_cs.c b/drivers/net/ethernet/8390/pcnet_cs.c > > > index 9d3b1e0e425c..0a408fa2b7a4 100644 > > > --- a/drivers/net/ethernet/8390/pcnet_cs.c > > > +++ b/drivers/net/ethernet/8390/pcnet_cs.c > > > @@ -289,11 +289,6 @@ static struct hw_info *get_hwinfo(struct pcmcia_device *link) > > > > > > virt = ioremap(link->resource[2]->start, > > > resource_size(link->resource[2])); > > > - if (unlikely(!virt)) { > > > - pcmcia_release_window(link, link->resource[2]); > > > - return NULL; > > > - } > > > - > > > for (i = 0; i < NR_INFO; i++) { > > > pcmcia_map_mem_page(link, link->resource[2], > > > hw_info[i].offset & ~(resource_size(link->resource[2])-1)); > > > @@ -1430,11 +1425,6 @@ static int setup_shmem_window(struct pcmcia_device *link, int start_pg, > > > /* Try scribbling on the buffer */ > > > info->base = ioremap(link->resource[3]->start, > > > resource_size(link->resource[3])); > > > - if (unlikely(!info->base)) { > > > - ret = -ENOMEM; > > > - goto failed; > > > - } > > > - > > > for (i = 0; i < (TX_PAGES<<8); i += 2) > > > __raw_writew((i>>1), info->base+offset+i); > > > udelay(100); > > > -- > > > 2.31.1 > > > > > > > This change causes a memory leak on the error path, so I will keep the > > revert. > > > > But really, a pcmcia card with a failed ioremap() call? That can never > > happen here, so I'll just keep it reverted, it's not worth touching > > again. > > I'm afraid that I have to disagree with your analysis. > > However, first thing is, it would help immensely if you actually said > where the memory leak is, rather than using this boiler plate and > rushing through the changes. > > On IRC, you mentioned it was due to the change in setup_shmem_window(), > specifically "no call to pcmcia_release_window()". This seems to imply > that you have no problem with the change to get_hwinfo(), and indeed > that part of the original change looks fully correct to me. So, > concentrating on the setup_shmem_window() change in this patch: Fair enough, I'll drop this revert from my tree as you feel the original commit was correct. thanks for the review. greg k-h