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| author |   Wen Yang <wen.yang99@zte.com.cn> | 2019-04-17 10:41:19 +0800 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2019-04-26 15:24:19 +0200 |
| commit | 1eb8e4e2b35b4d83cc40cbf379493490741eb5b8 (patch) | |
| tree | 6ff7d752c9351fa5379f47340998b716a9482210 /drivers/iommu | |
| parent | Linux 5.1-rc6 (diff) | |
| download | linux-dev-1eb8e4e2b35b4d83cc40cbf379493490741eb5b8.tar.xz linux-dev-1eb8e4e2b35b4d83cc40cbf379493490741eb5b8.zip | |
iommu/mediatek: Fix leaked of_node references
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 <wen.yang99@zte.com.cn>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
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 <mbrugger@suse.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/mtk_iommu.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index de3e02277b70..b66d11b0286e 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, |