From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 112AE1C08 for ; Wed, 28 Dec 2022 16:35:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 85385C433D2; Wed, 28 Dec 2022 16:35:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672245334; bh=j6F/wc8vtUCvD9wCq4ZyLu9xcW/gTLGrdtJRhN+GuYc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QuvaeMwFGgk/bCIbpZslaxARJj+WiJu4W1UH7LgkmwdONRwOSA1dsOnenMl4cDsMI Jp3tMEqpfDSmIDk8KevGe0q1PUeWXTGiVQDUye+bfh7SwVUTNb4K4rul6CLWfq0bgu GBarSpLLStEGHiT0WN5XriygNg4FOLKDFAjCB7FU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Yingliang , Matthias Brugger , Joerg Roedel , Sasha Levin Subject: [PATCH 6.1 0841/1146] iommu/mediatek: Check return value after calling platform_get_resource() Date: Wed, 28 Dec 2022 15:39:40 +0100 Message-Id: <20221228144352.999261585@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144330.180012208@linuxfoundation.org> References: <20221228144330.180012208@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Yang Yingliang [ Upstream commit 73b6924cdebc899de9b719e1319aa86c6bed4acf ] platform_get_resource() may return NULL pointer, we need check its return value to avoid null-ptr-deref in resource_size(). Fixes: 42d57fc58aeb ("iommu/mediatek: Initialise/Remove for multi bank dev") Signed-off-by: Yang Yingliang Reviewed-by: Matthias Brugger Link: https://lore.kernel.org/r/20221029103550.3774365-1-yangyingliang@huawei.com Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/mtk_iommu.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 2ab2ecfe01f8..2d14dc846b83 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1173,6 +1173,8 @@ static int mtk_iommu_probe(struct platform_device *pdev) banks_num = data->plat_data->banks_num; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; if (resource_size(res) < banks_num * MTK_IOMMU_BANK_SZ) { dev_err(dev, "banknr %d. res %pR is not enough.\n", banks_num, res); return -EINVAL; -- 2.35.1