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Date: Wed, 23 Nov 2022 19:01:36 +0100 From: Michael Walle <michael@...le.cc> To: Jonathan Corbet <corbet@....net>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, Miquel Raynal <miquel.raynal@...tlin.com>, Rob Herring <robh+dt@...nel.org>, Frank Rowand <frowand.list@...il.com>, Sascha Hauer <s.hauer@...gutronix.de> Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, Michael Walle <michael@...le.cc> Subject: [PATCH v4 05/20] nvmem: core: fix device node refcounting In of_nvmem_cell_get(), of_get_next_parent() is used on cell_np. This will decrement the refcount on cell_np, but cell_np is still used later in the code. Use of_get_parent() instead and of_node_put() in the appropriate places. Signed-off-by: Michael Walle <michael@...le.cc> --- changes since v3: - none changes since v2: - new patch drivers/nvmem/core.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 321d7d63e068..205a427f564d 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1242,16 +1242,21 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id) if (!cell_np) return ERR_PTR(-ENOENT); - nvmem_np = of_get_next_parent(cell_np); - if (!nvmem_np) + nvmem_np = of_get_parent(cell_np); + if (!nvmem_np) { + of_node_put(cell_np); return ERR_PTR(-EINVAL); + } nvmem = __nvmem_device_get(nvmem_np, device_match_of_node); of_node_put(nvmem_np); - if (IS_ERR(nvmem)) + if (IS_ERR(nvmem)) { + of_node_put(cell_np); return ERR_CAST(nvmem); + } cell_entry = nvmem_find_cell_entry_by_node(nvmem, cell_np); + of_node_put(cell_np); if (!cell_entry) { __nvmem_device_put(nvmem); return ERR_PTR(-ENOENT); -- 2.30.2
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