>From e7dbe4c4b64eb114f9b0804d6af3a3ca0e78acc8 Mon Sep 17 00:00:00 2001 From: Michael Jones <michael.jones@xxxxxxxxxxxxxxxx> Date: Mon, 7 Mar 2011 13:36:15 +0100 Subject: [PATCH] omap: iommu: disallow mapping NULL address commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping the NULL address if da_start==0. Force da_start to exclude the first page. Signed-off-by: Michael Jones <michael.jones@xxxxxxxxxxxxxxxx> --- arch/arm/plat-omap/iommu.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c index 5990ea6..dcb5513 100644 --- a/arch/arm/plat-omap/iommu.c +++ b/arch/arm/plat-omap/iommu.c @@ -850,7 +850,7 @@ int iommu_set_da_range(struct iommu *obj, u32 start, u32 end) if (end < start || !PAGE_ALIGN(start | end)) return -EINVAL; - obj->da_start = start; + obj->da_start = max(start, (u32)PAGE_SIZE); obj->da_end = end; return 0; @@ -950,7 +950,9 @@ static int __devinit omap_iommu_probe(struct platform_device *pdev) obj->name = pdata->name; obj->dev = &pdev->dev; obj->ctx = (void *)obj + sizeof(*obj); - obj->da_start = pdata->da_start; + + /* reserve the first page for NULL */ + obj->da_start = max(pdata->da_start, (u32)PAGE_SIZE); obj->da_end = pdata->da_end; mutex_init(&obj->iommu_lock); -- 1.7.4.1 MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler Registergericht: Amtsgericht Stuttgart, HRB 271090 Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
