linux-kernel - [PATCH v5 3/8] iommu/rockchip: Fix allocation of bases array in driver probe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1466734413-7453-4-git-send-email-zhengsq@rock-chips.com>
Date:	Fri, 24 Jun 2016 10:13:28 +0800
From:	Shunqian Zheng <zhengsq@...k-chips.com>
To:	joro@...tes.org, heiko@...ech.de, robh+dt@...nel.org,
	mark.rutland@....com, linux@...linux.org.uk,
	mark.yao@...k-chips.com, airlied@...ux.ie, tfiga@...gle.com,
	xxm@...k-chips.com
Cc:	linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	Shunqian Zheng <zhengsq@...k-chips.com>,
	Tomasz Figa <tfiga@...omium.org>
Subject: [PATCH v5 3/8] iommu/rockchip: Fix allocation of bases array in driver probe

In .probe(), devm_kzalloc() is called with size == 0 and works only
by luck, due to internal behavior of the allocator and the fact
that the proper allocation size is small. Let's use proper value for
calculating the size.

Fixes: cd6438c5f844 ("iommu/rockchip: Reconstruct to support multi slaves")

Signed-off-by: Shunqian Zheng <zhengsq@...k-chips.com>
Signed-off-by: Tomasz Figa <tfiga@...omium.org>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
---
 drivers/iommu/rockchip-iommu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 53fa0d9..8a5bac7 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1034,6 +1034,7 @@ static int rk_iommu_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct rk_iommu *iommu;
 	struct resource *res;
+	int num_res = pdev->num_resources;
 	int i;
 
 	iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
@@ -1043,12 +1044,13 @@ static int rk_iommu_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, iommu);
 	iommu->dev = dev;
 	iommu->num_mmu = 0;
-	iommu->bases = devm_kzalloc(dev, sizeof(*iommu->bases) * iommu->num_mmu,
+
+	iommu->bases = devm_kzalloc(dev, sizeof(*iommu->bases) * num_res,
 				    GFP_KERNEL);
 	if (!iommu->bases)
 		return -ENOMEM;
 
-	for (i = 0; i < pdev->num_resources; i++) {
+	for (i = 0; i < num_res; i++) {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 		if (!res)
 			continue;
-- 
1.9.1