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dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 496c8Q3knWz9sT3 for ; Wed, 22 Apr 2020 20:28:06 +1000 (AEST) 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=Ua0o/aEXOKl+87FuOp5RxU9WavoRzrezMz1q7bJ5kBw=; b=kIrDEtQBKtxIH7 oOByL5FV507icskl/Ko8McDHq0fnJ7t7z61K5sw00FL6He2petKBLkzQUSFEEZ1CxFQJnih9oJ5TE P3BzqYeJPC6xX/6HaVBoCZe/QA76WvUOcgO33Ej/Br/43YRqSlMRcS/uCfsLxl+xpNtsiViuiYXCA f54lRPthF0jQH41cVyfJbn/d7h3IbQ4jETlsTh+uWAf9gdETo7QHZfkL+sd3CJzGFiMsKrAIiri0u +wfmjGoXwfshY4abWpMD7kUP098bUfuDdFVtXy0ldq4c0tmFhXeUH+dohTHolQMMXFJG9IxXSklBz vcKSMBlR5flbhfm/IzKA==; 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 1jRCbe-00010X-O7; Wed, 22 Apr 2020 10:27:50 +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 1jRCbc-0000z3-03 for linux-mtd@lists.infradead.org; Wed, 22 Apr 2020 10:27:49 +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 13C872076B; Wed, 22 Apr 2020 10:27:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587551266; bh=x9o356t3GFTMdLhsII0MkSSipdwmAm2zA7xCIh92LPE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WY5Z1SxCsjQYiwYENEs81E7f9kWcO3XpcwY1NnQUH+hjHqbO4BQkebpIMr3S5Kdhp HFiJzCFoHAuqtP8ghgRLPFlbIqFNrvtgqbQ5y8CWimJfXj+pLP0g8k4C0h76Lj9qDE 62h9lIRRFUqDMkPE4XRQC04QQSFw9ZOVTqsdkWwk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Subject: [PATCH 5.6 161/166] mtd: phram: fix a double free issue in error path Date: Wed, 22 Apr 2020 11:58:08 +0200 Message-Id: <20200422095105.674074170@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200422095047.669225321@linuxfoundation.org> References: <20200422095047.669225321@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_032748_074292_775D8128 X-CRM114-Status: GOOD ( 11.76 ) X-Spam-Score: -5.0 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-5.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender 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 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.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 @@ -243,22 +243,25 @@ 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; }