From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 31 Jan 2024 17:57:59 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1rVDuQ-00E3PW-1l for lore@lore.pengutronix.de; Wed, 31 Jan 2024 17:57:59 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rVDuQ-0005uA-Gu for lore@pengutronix.de; Wed, 31 Jan 2024 17:57:59 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=s5MwZN6hLg0DMaMJwhemsP9QvfryeHDESRmvrjEZEwI=; b=VX0XerMqXLXAhGCQcwHHozXbO6 46AO3NYT+hGhPjO10j584ERhqmWxLf83H9YHrc3RflnYvnpUD88vTTlITTeosBNkLdqKAWsA14ygP 3I3BLqs20G1Rp/GuGRQO3mIZYabIEtgpuN3WYSYqnwmcPAvzrowy3x2HjPng+m7P7d4bpHOKqLZjF dLJ8M00uX0WpPvvXcQrANwWBPjuJGo8Qo4cJl8SYQkqji7MP5dK2Tre2/wNX+ZCteiw2dZDIUc10z LgxkPh9L4bwMh9yRwALrwG5nHgVbW3vmkZk2kKmyx83XJFCSM+NIAMMTxR451wwg9zw202tlusA7f WNNg+81g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rVDto-00000004hLX-2E3T; Wed, 31 Jan 2024 16:57:20 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rVDti-00000004hEa-3Lz8 for barebox@lists.infradead.org; Wed, 31 Jan 2024 16:57:16 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rVDtc-0005jC-U9; Wed, 31 Jan 2024 17:57:08 +0100 Received: from [2a0a:edc0:0:1101:1d::54] (helo=dude05.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1rVDtc-003fm3-Gt; Wed, 31 Jan 2024 17:57:08 +0100 Received: from localhost ([::1] helo=dude05.red.stw.pengutronix.de) by dude05.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1rVDtc-006OFT-1V; Wed, 31 Jan 2024 17:57:08 +0100 From: Stefan Kerkmann Date: Wed, 31 Jan 2024 17:56:59 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240131-fix-fdt-memory-safety-v1-1-3d3a2c797eec@pengutronix.de> References: <20240131-fix-fdt-memory-safety-v1-0-3d3a2c797eec@pengutronix.de> In-Reply-To: <20240131-fix-fdt-memory-safety-v1-0-3d3a2c797eec@pengutronix.de> To: Sascha Hauer , BAREBOX Cc: Stefan Kerkmann X-Mailer: b4 0.12.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240131_085714_978185_6AFCB580 X-CRM114-Status: GOOD ( 11.87 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-6.2 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 1/2] of: fdt: fix memory leak in fdt_ensure_space X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) If the reallocation failed the old memory remains allocated and is never freed, this is fixed by freeing the old memory on error. Signed-off-by: Stefan Kerkmann --- drivers/of/fdt.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 5c21bab5de..4f79a6120f 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -375,24 +375,37 @@ static void *memalign_realloc(void *orig, size_t oldsize, size_t newsize) static int fdt_ensure_space(struct fdt *fdt, int dtsize) { + size_t new_size; + void *previous; + /* * We assume strings and names have a maximum length of 1024 * whereas properties can be longer. We allocate new memory * if we have less than 1024 bytes (+ the property size left. */ if (fdt->str_size - fdt->str_nextofs < 1024) { - fdt->strings = realloc(fdt->strings, fdt->str_size * 2); - if (!fdt->strings) + previous = fdt->strings; + new_size = fdt->str_size * 2; + + if ((fdt->strings = realloc(previous, new_size)) == NULL) { + free(previous); return -ENOMEM; - fdt->str_size *= 2; + } + + fdt->str_size = new_size; } if (fdt->dt_size - fdt->dt_nextofs < 1024 + dtsize) { - fdt->dt = memalign_realloc(fdt->dt, fdt->dt_size, - fdt->dt_size * 2); - if (!fdt->dt) + previous = fdt->dt; + new_size = fdt->dt_size * 2; + + if ((fdt->dt = memalign_realloc(previous, fdt->dt_size, + new_size)) == NULL) { + free(previous); return -ENOMEM; - fdt->dt_size *= 2; + } + + fdt->dt_size = new_size; } return 0; -- 2.39.2