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 38B861C07 for ; Wed, 28 Dec 2022 16:27:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B414AC433D2; Wed, 28 Dec 2022 16:27:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672244877; bh=oxZmb81wvZ5UFzg+zwWOs/hDFnklGRqG/BdZqsiI2HY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vrnrVZfdrVZ8SxAMe/FaLUfgguD2sXba2uFkv/XqHzYFIzkNftnGK+k0c1/8lhnDv bSEJncnTszKdR99cqF8Mlo7YQqbz2THWFxLjxRR26k3YeSYVUwjMb+ncB10TcL0W6/ j8za1CUpXCYnZPOa0S3ATumEPCARKKmPwLaWrwbg= 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 6.0 0792/1073] iommu/mediatek: Check return value after calling platform_get_resource() Date: Wed, 28 Dec 2022 15:39:40 +0100 Message-Id: <20221228144349.522893826@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144328.162723588@linuxfoundation.org> References: <20221228144328.162723588@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 7e363b1f24df..0c1c0d8e4d06 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1170,6 +1170,8 @@ 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