Messages in this thread Patch in this message | | | From | Colin King <> | Subject | [PATCH][next] iommu/vt-d: Fix dereference of pointer info before it is null checked | Date | Fri, 11 Jun 2021 14:50:24 +0100 |
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From: Colin Ian King <colin.king@canonical.com>
The assignment of iommu from info->iommu occurs before info is null checked hence leading to a potential null pointer dereference issue. Fix this by assigning iommu and checking if iommu is null after null checking info.
Addresses-Coverity: ("Dereference before null check") Fixes: 4c82b88696ac ("iommu/vt-d: Allocate/register iopf queue for sva devices") Signed-off-by: Colin Ian King <colin.king@canonical.com> --- drivers/iommu/intel/iommu.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index bd93c7ec879e..76a58b8ad6c3 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -5329,10 +5329,14 @@ static int intel_iommu_disable_auxd(struct device *dev) static int intel_iommu_enable_sva(struct device *dev) { struct device_domain_info *info = get_domain_info(dev); - struct intel_iommu *iommu = info->iommu; + struct intel_iommu *iommu; int ret; - if (!info || !iommu || dmar_disabled) + if (!info || dmar_disabled) + return -EINVAL; + + iommu = info->iommu; + if (!iommu) return -EINVAL; if (!(iommu->flags & VTD_FLAG_SVM_CAPABLE)) -- 2.31.1
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