Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 33/36] iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid() | Date | Mon, 3 Jul 2017 15:34:30 +0200 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Pan Bian <bianpan2016@163.com>
commit 73dbd4a4230216b6a5540a362edceae0c9b4876b 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: Pan Bian <bianpan2016@163.com> Fixes: f0aac63b873b ('iommu/amd: Don't hold a reference to mm_struct') Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/iommu/amd_iommu_v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -701,9 +701,9 @@ out_clear_state: 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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