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,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 A9329C55189 for ; Wed, 22 Apr 2020 10:18:03 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 48B022075A for ; Wed, 22 Apr 2020 10:18:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="pr+hY3H7"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="MXXSggWK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 48B022075A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PMMyZNxfg8QRQ54YJHrFFy1n7wJ69JZ26eGVSTQsNSs=; b=pr+hY3H74evZZC 9oGt6oGOK5xl4YbyN1ZEaw6iRRM05DHUAwi4rjR+Ja671SrbCV4gS+D0HTnsZpTR5roATEuwrXuc6 COmAO9XlhFSq3IKDG/jXK+QA59uhC7OAICRiCpyGNDur43laNJcL89Wn4IQS2bK9P2vbg9O7M3J13 lRxHWOGJvaH9TvfG1lWO16HmhxgmPjtogkEN2tlqoKw/zoMdHdfgtfjRmP/UW3JXGhRuUiWfPT7VY iCHG/c/3ZhdI0yn2gTMKsa3Efje06SQD8rDcB6hLC2DkkUh5yVFjqzACSsou1JnT6k6Y0/4z/w+r8 wLpI4ExMYMaZTw8ZDmpA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jRCRz-0000a5-1c; Wed, 22 Apr 2020 10:17:51 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jRCQL-0008VG-6e for linux-mtd@lists.infradead.org; Wed, 22 Apr 2020 10:16:10 +0000 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 54D4720575; Wed, 22 Apr 2020 10:16:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587550568; bh=w2PUQYTQ73NwbewyrZ1u9QihBf5HuPs7RlYsAgFI3/c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MXXSggWKAZIJvvqqtcGA1DDoV9ppZO3e4DsEVOsKgw4SnnRrMnXVXHMrGMX6MvYV2 Z6DTmGj7DnNOBhpzW/BaL0p3NLkOMzPzZYr+t9hYhZHWQE+YEyAXg04Gn7FDybSS/y CLLMcPlsdM8ryl+r7Gv3ggTpNPldB2n82qTLsBVE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Subject: [PATCH 4.19 62/64] mtd: phram: fix a double free issue in error path Date: Wed, 22 Apr 2020 11:57:46 +0200 Message-Id: <20200422095024.382706291@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200422095008.799686511@linuxfoundation.org> References: <20200422095008.799686511@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200422_031609_260453_1002D4BB X-CRM114-Status: GOOD ( 11.76 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wen Yang , Richard Weinberger , Miquel Raynal , Joern Engel , stable@vger.kernel.org, linux-mtd@lists.infradead.org, Greg Kroah-Hartman , Vignesh Raghavendra Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org From: Wen Yang commit 49c64df880570034308e4a9a49c4bc95cf8cdb33 upstream. The variable 'name' is released multiple times in the error path, which may cause double free issues. This problem is avoided by adding a goto label to release the memory uniformly. And this change also makes the code a bit more cleaner. Fixes: 4f678a58d335 ("mtd: fix memory leaks in phram_setup") Signed-off-by: Wen Yang Cc: Joern Engel Cc: Miquel Raynal Cc: Richard Weinberger Cc: Vignesh Raghavendra Cc: linux-mtd@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200318153156.25612-1-wenyang@linux.alibaba.com Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/devices/phram.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) --- a/drivers/mtd/devices/phram.c +++ b/drivers/mtd/devices/phram.c @@ -240,22 +240,25 @@ static int phram_setup(const char *val) ret = parse_num64(&start, token[1]); if (ret) { - kfree(name); parse_err("illegal start address\n"); + goto error; } ret = parse_num64(&len, token[2]); if (ret) { - kfree(name); parse_err("illegal device length\n"); + goto error; } ret = register_device(name, start, len); - if (!ret) - pr_info("%s device: %#llx at %#llx\n", name, len, start); - else - kfree(name); + if (ret) + goto error; + pr_info("%s device: %#llx at %#llx\n", name, len, start); + return 0; + +error: + kfree(name); return ret; } ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/