Commit e82936b3 authored Dec 28, 2015 by Susheel Khiani

iommu: Add NULL pointer check in iommu_present function



We call msm_iommu_bus_register only when legacy
msm iommu driver is enabled. If for some reason
the driver is disabled, we never register our
dummy bus msm_iommu_non_sec_bus_type. So, we might
end up with NULL pointer exception if clients try
to call iommu_present with this dummy bus.

Put a NULL pointer check to ensure we don't end
up crashing system if legacy driver is disabled.

Change-Id: I7122e3355459e5115d639a8c1aab547bf0fc7f6e
Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>

parent 05352690

drivers/iommu/iommu.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -882,6 +882,8 @@ EXPORT_SYMBOL_GPL(bus_set_iommu);

		bool iommu_present(struct bus_type *bus)
		{
		if (!bus)
		return false;
		return bus->iommu_ops != NULL;
		}
		EXPORT_SYMBOL_GPL(iommu_present);