From patchwork Mon May 24 20:02:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 447790 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 2464BC04FF3 for ; Mon, 24 May 2021 20:03:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 07EA4613E1 for ; Mon, 24 May 2021 20:03:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233070AbhEXUEv (ORCPT ); Mon, 24 May 2021 16:04:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51964 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232107AbhEXUEt (ORCPT ); Mon, 24 May 2021 16:04:49 -0400 Received: from mail-lj1-x233.google.com (mail-lj1-x233.google.com [IPv6:2a00:1450:4864:20::233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 373B7C061574; Mon, 24 May 2021 13:03:20 -0700 (PDT) Received: by mail-lj1-x233.google.com with SMTP id o8so35268924ljp.0; Mon, 24 May 2021 13:03:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0TvcNqO8y/T8IOAJyjMW8G5WN+KH4SERQRY6RJUUVRw=; b=IuaRkBUxYutRp/MLX85Bv4hSJUyKCYGgXgnWXiP2Qj/xgc3Dj9kQbatOc7H8Ok33Hp Y8U8jHuC0o3fHQBjnP9OezFQQbBoldnhmMo1BxJ1mKVcu115S8KcArIODzVsf8mDyMjE Uun67iM8BGnioUpYzie8357yQB3rbEiZez1okEVcRMhtH9+cLE8CHN2J8sgh5Scn3jwG ss4feSZWkPA/QLdjls4MOdxMVK+E7gup9o2Euey2EoUiSfuGCn+fbls9rcOzkbmC31Hy pzQaKomK57bH9sk+qaDmIWWrftv849UCeIckcLFm4Y1afIJJtLA+s/CGAqtDNsmPjeWN JPZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0TvcNqO8y/T8IOAJyjMW8G5WN+KH4SERQRY6RJUUVRw=; b=My4TXcUIrs/hWY4m3MRmltlVwNyXplbQvI9a3GVVDKDEZDZfaZXcrjHK/aViWyzI0V M0ZGP1Eu4qNOdIWU4LDifjLagDZDp3nNzoP1u0OBmxf1/jop28f7JuOsrZYh2jbhXIwQ fg4lSYP/YQ0y9DCeSrIpEpLLAiEpkTRJ6iIEiL/vbdjiw/XW07eQfSCrO0ow4PcX9YhY B9+Wvs8rSsJl8difkHWorHpbM0Bb5WP/V/LRTE1ImfaDqMXTsmvwr6Q1WX2vhowAVNP4 cYIBFB0V6cC8Kk6f4YAHeA6owlMr4+TtHYwnSOMomwnJhUZ6JqvlUysClbj5MalTF017 QZuA== X-Gm-Message-State: AOAM533e653hozPm8+Nm1kqj2rg3e7wp/Z89QfuEO/oN/f/qabM8N51G s9Beg58ZHvbFFVv+X2tqTuk= X-Google-Smtp-Source: ABdhPJzbxGDW3Al7PoN5M/RPXxhfzW9bbMx9Uet1by/yGEsH0DKWA3xcacXj4rTRDqgtAbnbttH8Dg== X-Received: by 2002:a2e:8710:: with SMTP id m16mr17914571lji.165.1621886598592; Mon, 24 May 2021 13:03:18 -0700 (PDT) Received: from localhost.localdomain ([94.103.229.209]) by smtp.gmail.com with ESMTPSA id d22sm1877957ljl.15.2021.05.24.13.03.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 May 2021 13:03:18 -0700 (PDT) From: Pavel Skripkin To: steve.glendinning@shawell.net, davem@davemloft.net, kuba@kernel.org Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin , stable@kernel.vger.org, syzbot+b558506ba8165425fee2@syzkaller.appspotmail.com Subject: [PATCH] net: usb: fix memory leak in smsc75xx_bind Date: Mon, 24 May 2021 23:02:08 +0300 Message-Id: <20210524200208.31621-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Syzbot reported memory leak in smsc75xx_bind(). The problem was is non-freed memory in case of errors after memory allocation. backtrace: [] kmalloc include/linux/slab.h:556 [inline] [] kzalloc include/linux/slab.h:686 [inline] [] smsc75xx_bind+0x7a/0x334 drivers/net/usb/smsc75xx.c:1460 [] usbnet_probe+0x3b6/0xc30 drivers/net/usb/usbnet.c:1728 Fixes: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver") Cc: stable@kernel.vger.org Reported-and-tested-by: syzbot+b558506ba8165425fee2@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin --- drivers/net/usb/smsc75xx.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c index f8cdabb9ef5a..b286993da67c 100644 --- a/drivers/net/usb/smsc75xx.c +++ b/drivers/net/usb/smsc75xx.c @@ -1483,7 +1483,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) ret = smsc75xx_wait_ready(dev, 0); if (ret < 0) { netdev_warn(dev->net, "device not ready in smsc75xx_bind\n"); - return ret; + goto err; } smsc75xx_init_mac_address(dev); @@ -1492,7 +1492,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) ret = smsc75xx_reset(dev); if (ret < 0) { netdev_warn(dev->net, "smsc75xx_reset error %d\n", ret); - return ret; + goto err; } dev->net->netdev_ops = &smsc75xx_netdev_ops; @@ -1502,6 +1502,10 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf) dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE; return 0; + +err: + kfree(pdata); + return ret; } static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)