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20 Mar 2020 06:49:18 -0700 Subject: Re: [PATCH 2/3] iommu/vt-d: Fix mm reference leak To: Jacob Pan , LKML , iommu@lists.linux-foundation.org, Joerg Roedel , David Woodhouse References: <1584678751-43169-1-git-send-email-jacob.jun.pan@linux.intel.com> <1584678751-43169-3-git-send-email-jacob.jun.pan@linux.intel.com> From: Lu Baolu Message-ID: <75592c19-309f-2626-68c9-1e74232be28e@linux.intel.com> Date: Fri, 20 Mar 2020 21:49:17 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <1584678751-43169-3-git-send-email-jacob.jun.pan@linux.intel.com> Content-Language: en-US Cc: Raj Ashok X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 2020/3/20 12:32, Jacob Pan wrote: > Move canonical address check before mmget_not_zero() to avoid mm > reference leak. > > Fixes: 9d8c3af31607 ("iommu/vt-d: IOMMU Page Request needs to check if > address is canonical.") > > Signed-off-by: Jacob Pan Acked-by: Lu Baolu Best regards, baolu > --- > drivers/iommu/intel-svm.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c > index 1483f1845762..56253c59ca10 100644 > --- a/drivers/iommu/intel-svm.c > +++ b/drivers/iommu/intel-svm.c > @@ -861,14 +861,15 @@ static irqreturn_t prq_event_thread(int irq, void *d) > * any faults on kernel addresses. */ > if (!svm->mm) > goto bad_req; > - /* If the mm is already defunct, don't handle faults. */ > - if (!mmget_not_zero(svm->mm)) > - goto bad_req; > > /* If address is not canonical, return invalid response */ > if (!is_canonical_address(address)) > goto bad_req; > > + /* If the mm is already defunct, don't handle faults. */ > + if (!mmget_not_zero(svm->mm)) > + goto bad_req; > + > down_read(&svm->mm->mmap_sem); > vma = find_extend_vma(svm->mm, address); > if (!vma || address < vma->vm_start) > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu