forked from Minki/linux
iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()
In function amd_iommu_bind_pasid(), the control flow jumps
to label out_free when pasid_state->mm and mm is NULL. And
mmput(mm) is called. In function mmput(mm), mm is
referenced without validation. This will result in a NULL
dereference bug. This patch fixes the bug.
Signed-off-by: Pan Bian <bianpan2016@163.com>
Fixes: f0aac63b87
('iommu/amd: Don't hold a reference to mm_struct')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -696,9 +696,9 @@ out_clear_state:
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out_unregister:
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mmu_notifier_unregister(&pasid_state->mn, mm);
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mmput(mm);
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out_free:
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mmput(mm);
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free_pasid_state(pasid_state);
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out:
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