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=-8.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 29683C43613 for ; Fri, 21 Jun 2019 09:12:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F27DC21530 for ; Fri, 21 Jun 2019 09:12:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lightnvm-io.20150623.gappssmtp.com header.i=@lightnvm-io.20150623.gappssmtp.com header.b="sSFnuYhs" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726525AbfFUJMO (ORCPT ); Fri, 21 Jun 2019 05:12:14 -0400 Received: from mail-lf1-f66.google.com ([209.85.167.66]:37464 "EHLO mail-lf1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726210AbfFUJMM (ORCPT ); Fri, 21 Jun 2019 05:12:12 -0400 Received: by mail-lf1-f66.google.com with SMTP id d11so4511696lfb.4 for ; Fri, 21 Jun 2019 02:12:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lightnvm-io.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=k4aXc+WCbb0KX3YXwP2LFgbpd81EOKzrd5cyRZaZTSg=; b=sSFnuYhsFN1JD56EIiE1pEfjm6C0QSyZG31411kwJRybXeYFh6pC5C8yQp22lVlwXe 0RZW82JsiuTifNXgpYfDvor7psQ1a+TZHnK57CSfKwGHg+AeqA4JmUZrBMhfnlvhPGET K5cisM7SCV5xW754YlV5rHRAgZN9L262ZefebDu/MTCz8ZLuXTwkkfmzCTXJTdXuO1Ub e6Bo+iqKVs6StBtV4THNiGApkGGzW/T9Bnkiacm15kj30YQfuNKOrQcErGQ8y1FS5OOa /xzpWU9gkb9vV2I8975rGq7NbVaO18XGeU6FmtFxgNTnIgzW5g/LSYuJzeYPkJrnCn75 py3g== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=k4aXc+WCbb0KX3YXwP2LFgbpd81EOKzrd5cyRZaZTSg=; b=ogh04dF18T0MqU0/X4oGyaNn1+DVK+Npo3U2oTueaGbhqnBvmcctp5cfbq8TrmeZ8z gVSz0q8CCVhTzje9vzUu6FTNTq6rMnGRcfNDaN5uGVc2t6vToz8cLo6u7I+WKs3fITd0 nAf7F75YVG4RHBqbPxZwqcinohlZDGfiQFt1UtZD5SR38tUPOBAaFy6mkcN/+oltatQv dsThVp6D2o60ihobOor/L1D+4YJ/yxHGaqq6YWDD9GZu21sxHx7L63hj96yMiRR6up++ I7FPYhVT6LgCEWThMiBuHpPoeLDTwx+cHqof76BxLEHoI0cefqCYMShTQw1z9ojv6pjx G5lQ== X-Gm-Message-State: APjAAAVSUmKXWV78+8mojePeiuF7oTMGURwe8pJaMIxTO+zqwUDr3gqN kCjKZ0gHDyyKJSG5UCs/48PSpw== X-Google-Smtp-Source: APXvYqzvbOWqaN5hXsBK1NV7YAT9x6a/dav5F34bCxNcV082rL8AhKA+NiD88XxrJVwsEh/8uCeRfA== X-Received: by 2002:a05:6512:24a:: with SMTP id b10mr65728968lfo.37.1561108330334; Fri, 21 Jun 2019 02:12:10 -0700 (PDT) Received: from skyninja.webspeed.dk (2-111-91-225-cable.dk.customer.tdc.net. [2.111.91.225]) by smtp.gmail.com with ESMTPSA id z26sm303178ljz.64.2019.06.21.02.12.09 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 21 Jun 2019 02:12:09 -0700 (PDT) From: =?UTF-8?q?Matias=20Bj=C3=B8rling?= To: axboe@fb.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven , =?UTF-8?q?Matias=20Bj=C3=B8rling?= Subject: [GIT PULL 2/2] lightnvm: fix uninitialized pointer in nvm_remove_tgt() Date: Fri, 21 Jun 2019 11:12:00 +0200 Message-Id: <20190621091200.23168-3-mb@lightnvm.io> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190621091200.23168-1-mb@lightnvm.io> References: <20190621091200.23168-1-mb@lightnvm.io> 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: Geert Uytterhoeven With gcc 4.1: drivers/lightnvm/core.c: In function ‘nvm_remove_tgt’: drivers/lightnvm/core.c:510: warning: ‘t’ is used uninitialized in this function Indeed, if no NVM devices have been registered, t will be an uninitialized pointer, and may be dereferenced later. A call to nvm_remove_tgt() can be triggered from userspace by issuing the NVM_DEV_REMOVE ioctl on the lightnvm control device. Fix this by preinitializing t to NULL. Fixes: 843f2edbdde085b4 ("lightnvm: do not remove instance under global lock") Signed-off-by: Geert Uytterhoeven Signed-off-by: Matias Bjørling --- drivers/lightnvm/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index 7d555b110ecd..a600934fdd9c 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -478,7 +478,7 @@ static void __nvm_remove_target(struct nvm_target *t, bool graceful) */ static int nvm_remove_tgt(struct nvm_ioctl_remove *remove) { - struct nvm_target *t; + struct nvm_target *t = NULL; struct nvm_dev *dev; down_read(&nvm_lock); -- 2.19.1