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

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commit 73dbd4a423 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: f0aac63b87 ('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>

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Pan Bian 2017-04-23 18:23:21 +08:00 • committed by Greg Kroah-Hartman

parent f0c31c674a

commit 0e55856b8f

1 changed files with 1 additions and 1 deletions

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drivers/iommu/amd_iommu_v2.c

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