From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 77B8EC433E0 for ; Fri, 19 Jun 2020 15:37:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 51B2B206FA for ; Fri, 19 Jun 2020 15:37:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592581065; bh=XdvTGOe+mAakrDz9iHlqGo/KRKencvAYF6pv20ttop4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=d+gQRSgs+7HqMJXhmMHxnWP+o7aBp4D8eGeYOHPeheF7cqKSwIAh4h3AvxC9lFjrM l1bITG0xgRrSZUBxkHgmP5gYPTkEhTO0AuKK8ugn1lhE6IN7z7P+d+AeI1qdVE2V8a 5JNEefhtXUEyufomlcazJlNBOVGd83XvlfF/HNkM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404730AbgFSP3z (ORCPT ); Fri, 19 Jun 2020 11:29:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:33338 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404705AbgFSP3n (ORCPT ); Fri, 19 Jun 2020 11:29:43 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A3A5320734; Fri, 19 Jun 2020 15:29:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592580582; bh=XdvTGOe+mAakrDz9iHlqGo/KRKencvAYF6pv20ttop4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FnfUPEmhe6uyN6vSGlGCCHQmaInW57KNCDlScRr7rXRNGgV2v7NW05Gba/SHNC6hG +8jE7uNfi3V9+cudqdv2d2gzc/enfNnyR9mjg3zr4XmYycjqJUPENzDu/E4ZAbSA0R Mn3JRcupUz+3RJ11ztDTUQiVSts3aSoGxwuc9Ro8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Larry Finger , Kalle Valo Subject: [PATCH 5.7 304/376] b43legacy: Fix case where channel status is corrupted Date: Fri, 19 Jun 2020 16:33:42 +0200 Message-Id: <20200619141724.730085241@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141710.350494719@linuxfoundation.org> References: <20200619141710.350494719@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Larry Finger commit ec4d3e3a054578de34cd0b587ab8a1ac36f629d9 upstream. This patch fixes commit 75388acd0cd8 ("add mac80211-based driver for legacy BCM43xx devices") In https://bugzilla.kernel.org/show_bug.cgi?id=207093, a defect in b43legacy is reported. Upon testing, thus problem exists on PPC and X86 platforms, is present in the oldest kernel tested (3.2), and has been present in the driver since it was first added to the kernel. The problem is a corrupted channel status received from the device. Both the internal card in a PowerBook G4 and the PCMCIA version (Broadcom BCM4306 with PCI ID 14e4:4320) have the problem. Only Rev, 2 (revision 4 of the 802.11 core) of the chip has been tested. No other devices using b43legacy are available for testing. Various sources of the problem were considered. Buffer overrun and other sources of corruption within the driver were rejected because the faulty channel status is always the same, not a random value. It was concluded that the faulty data is coming from the device, probably due to a firmware bug. As that source is not available, the driver must take appropriate action to recover. At present, the driver reports the error, and them continues to process the bad packet. This is believed that to be a mistake, and the correct action is to drop the correpted packet. Fixes: 75388acd0cd8 ("add mac80211-based driver for legacy BCM43xx devices") Cc: Stable Signed-off-by: Larry Finger Reported-and-tested by: F. Erhard Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20200407190043.1686-1-Larry.Finger@lwfinger.net Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/broadcom/b43legacy/xmit.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/net/wireless/broadcom/b43legacy/xmit.c +++ b/drivers/net/wireless/broadcom/b43legacy/xmit.c @@ -558,6 +558,7 @@ void b43legacy_rx(struct b43legacy_wldev default: b43legacywarn(dev->wl, "Unexpected value for chanstat (0x%X)\n", chanstat); + goto drop; } memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));