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([37.223.141.112]) by smtp.gmail.com with ESMTPSA id z3sm8544484eja.32.2019.04.17.01.28.22 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 01:28:22 -0700 (PDT) Subject: Re: [PATCH] iommu/mediatek: fix leaked of_node references To: Wen Yang , linux-kernel@vger.kernel.org Cc: wang.yi59@zte.com.cn, Joerg Roedel , iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org References: <1555468879-34684-1-git-send-email-wen.yang99@zte.com.cn> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe 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Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/04/2019 04:41, Wen Yang wrote: > The call to of_parse_phandle returns a node pointer with refcount > incremented thus it must be explicitly decremented after the last > usage. > > 581 static int mtk_iommu_probe(struct platform_device *pdev) > 582 { > ... > 626 for (i = 0; i < larb_nr; i++) { > 627 struct device_node *larbnode; > ... > 631 larbnode = of_parse_phandle(...); > 632 if (!larbnode) > 633 return -EINVAL; > 634 > 635 if (!of_device_is_available(larbnode)) > 636 continue; ---> leaked here > 637 > ... > 643 if (!plarbdev) > 644 return -EPROBE_DEFER; ---> leaked here > ... > 647 component_match_add_release(dev, &match, release_of, > 648 compare_of, larbnode); > ---> release_of will call of_node_put > 649 } > ... > 650 > > Detected by coccinelle with the following warnings: > ./drivers/iommu/mtk_iommu.c:644:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 631, but without a corresponding object release within this function. > > Signed-off-by: Wen Yang > Cc: Joerg Roedel > Cc: Matthias Brugger > Cc: iommu@lists.linux-foundation.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-mediatek@lists.infradead.org > Cc: linux-kernel@vger.kernel.org Reviewed-by: Matthias Brugger > --- > drivers/iommu/mtk_iommu.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index de3e022..b66d11b 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -632,16 +632,20 @@ static int mtk_iommu_probe(struct platform_device *pdev) > if (!larbnode) > return -EINVAL; > > - if (!of_device_is_available(larbnode)) > + if (!of_device_is_available(larbnode)) { > + of_node_put(larbnode); > continue; > + } > > ret = of_property_read_u32(larbnode, "mediatek,larb-id", &id); > if (ret)/* The id is consecutive if there is no this property */ > id = i; > > plarbdev = of_find_device_by_node(larbnode); > - if (!plarbdev) > + if (!plarbdev) { > + of_node_put(larbnode); > return -EPROBE_DEFER; > + } > data->smi_imu.larb_imu[id].dev = &plarbdev->dev; > > component_match_add_release(dev, &match, release_of, >