linux-kernel - [PATCH v5 3/8] of: fix size when dma-range is not used

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: <1422392405-32196-4-git-send-email-m-karicheri2@ti.com>
Date:	Tue, 27 Jan 2015 16:00:00 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	<devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>
CC:	Murali Karicheri <m-karicheri2@...com>,
	Joerg Roedel <joro@...tes.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: [PATCH v5 3/8] of: fix size when dma-range is not used

Fix the dma-range size when the DT attribute is missing. i.e  set size to
dev->coherent_dma_mask + 1 instead of dev->coherent_dma_mask. Also add
code to check invalid values of size configured in DT and log error.

Cc: Joerg Roedel <joro@...tes.org>
Cc: Grant Likely <grant.likely@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Will Deacon <will.deacon@....com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 drivers/of/device.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 2de320d..17504f4 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -105,12 +105,19 @@ void of_dma_configure(struct device *dev, struct device_node *np)
 	ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
 	if (ret < 0) {
 		dma_addr = offset = 0;
-		size = dev->coherent_dma_mask;
+		size = dev->coherent_dma_mask + 1;
 	} else {
 		offset = PFN_DOWN(paddr - dma_addr);
 		dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
 	}
 
+	if (is_power_of_2(size + 1))
+		size = size + 1;
+	else if (!is_power_of_2(size)) {
+		dev_err(dev, "invalid size\n");
+		return;
+	}
+
 	dev->dma_pfn_offset = offset;
 
 	coherent = of_dma_is_coherent(np);
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/