Commit 0e55856b authored by Pan Bian's avatar Pan Bian Committed by Greg Kroah-Hartman

iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()

commit 73dbd4a4 upstream.

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: default avatarPan Bian <bianpan2016@163.com>
Fixes: f0aac63b ('iommu/amd: Don't hold a reference to mm_struct')
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f0c31c67
......@@ -695,9 +695,9 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
out_unregister:
mmu_notifier_unregister(&pasid_state->mn, mm);
mmput(mm);
out_free:
mmput(mm);
free_pasid_state(pasid_state);
out:
......
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