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iommu/omap: Check for valid archdata in attach_dev 

Any device requiring to be attached to an iommu_domain must have
valid archdata containing the necessary iommu information, which
is SoC-specific. Add a check in the omap_iommu_attach_dev to make
sure that the device has valid archdata before accessing
different SoC-specific fields of the archdata. This prevents a
NULL pointer dereference on any misconfigured devices.

Signed-off-by: Suman Anna <s-anna@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Suman Anna 2014-09-04 17:27:29 -05:00 committed by Joerg Roedel
parent 69e273c0b0
commit e3f595b903
1 changed files with 5 additions and 0 deletions
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5
drivers/iommu/omap-iommu.c
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@ -1091,6 +1091,11 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
int ret = 0;
if (!arch_data || !arch_data->name) {
dev_err(dev, "device doesn't have an associated iommu\n");
return -EINVAL;
}
spin_lock(&omap_domain->lock);
/* only a single device is supported per domain for now */