This is a note to let you know that I've just added the patch titled iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid() to the 4.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-amd-fix-incorrect-error-handling-in-amd_iommu_bind_pasid.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 73dbd4a4230216b6a5540a362edceae0c9b4876b Mon Sep 17 00:00:00 2001 From: Pan Bian <bianpan2016@xxxxxxx> Date: Sun, 23 Apr 2017 18:23:21 +0800 Subject: iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid() From: Pan Bian <bianpan2016@xxxxxxx> 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@xxxxxxx> Fixes: f0aac63b873b ('iommu/amd: Don't hold a reference to mm_struct') Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -696,9 +696,9 @@ out_clear_state: out_unregister: mmu_notifier_unregister(&pasid_state->mn, mm); + mmput(mm); out_free: - mmput(mm); free_pasid_state(pasid_state); out: Patches currently in stable-queue which might be from bianpan2016@xxxxxxx are queue-4.11/iommu-amd-fix-incorrect-error-handling-in-amd_iommu_bind_pasid.patch