From patchwork Fri May 20 16:41:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe JAILLET X-Patchwork-Id: 12857005 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9741FC433EF for ; Fri, 20 May 2022 16:42:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=AzQQAMvEz+43faI71fvZZk75/5P5dsGI4FXmdzVUCc0=; b=cWROEeW8Zbgrw1 l0MIOOJqW7QrupqtMox8ah9xSejupqLfbBCf6KPvAmxriTP6EYoRldnX4oUJ36LmE10eqhZDZ2Y75 EjygPFHR74iO02e+eEFyR+5ZSeXr+rApUUDkEuUbHpolrVG9m7deUY9+s/UPDqckXW4GN5CNlRlrX Buz0S3Szm8SgVon8j/16Wsz4gsF0aTX+Qic1VWqrgZNecgyV2Y8ZtFd7js6H2QAzbxyjKtPWWOs3b QT2GCb+V+Sj7htHZtL8ipkdY/FntTyca2yA1uoIgRB26w8Nw9Hd8bB0sDEdwMqTWY29M1S+doh5LA s0+qqvcNToPFvqJIqkyw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ns5hK-00Dlk9-DO; Fri, 20 May 2022 16:41:54 +0000 Received: from smtp02.smtpout.orange.fr ([80.12.242.124] helo=smtp.smtpout.orange.fr) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ns5hG-00DlfQ-6D for linux-arm-kernel@lists.infradead.org; Fri, 20 May 2022 16:41:52 +0000 Received: from pop-os.home ([86.243.180.246]) by smtp.orange.fr with ESMTPA id s5h8n8HpQgoLGs5h8nsi7u; Fri, 20 May 2022 18:41:44 +0200 X-ME-Helo: pop-os.home X-ME-Auth: YWZlNiIxYWMyZDliZWIzOTcwYTEyYzlhMmU3ZiQ1M2U2MzfzZDfyZTMxZTBkMTYyNDBjNDJlZmQ3ZQ== X-ME-Date: Fri, 20 May 2022 18:41:44 +0200 X-ME-IP: 86.243.180.246 From: Christophe JAILLET To: Liang Yang , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Yixun Lan , Jianxin Pan Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Christophe JAILLET , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org Subject: [PATCH] mtd: rawnand: meson: Fix a potential double free issue Date: Fri, 20 May 2022 18:41:40 +0200 Message-Id: X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220520_094150_455214_0C67B2CF X-CRM114-Status: UNSURE ( 9.75 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When meson_nfc_nand_chip_cleanup() is called, it will call: meson_nfc_free_buffer(&meson_chip->nand); nand_cleanup(&meson_chip->nand); nand_cleanup() in turn will call nand_detach() which calls the .detach_chip() which is here meson_nand_detach_chip(). meson_nand_detach_chip() already calls meson_nfc_free_buffer(), so we could double free some memory. Fix it by removing the unneeded explicit call to meson_nfc_free_buffer(). Fixes: 8fae856c5350 ("mtd: rawnand: meson: add support for Amlogic NAND flash controller") Signed-off-by: Christophe JAILLET Acked-by: Liang Yang --- This patch is speculative, so review with care. --- drivers/mtd/nand/raw/meson_nand.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c index ac3be92872d0..032180183339 100644 --- a/drivers/mtd/nand/raw/meson_nand.c +++ b/drivers/mtd/nand/raw/meson_nand.c @@ -1307,7 +1307,6 @@ static int meson_nfc_nand_chip_cleanup(struct meson_nfc *nfc) if (ret) return ret; - meson_nfc_free_buffer(&meson_chip->nand); nand_cleanup(&meson_chip->nand); list_del(&meson_chip->node); }