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| author | Michael Walle <michael@walle.cc> | 2023-01-27 13:40:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-02-09 13:28:25 +0300 |
| commit | d78f5d46fc2a43aae0d9509bcbcb495a7c67a54d (patch) | |
| tree | 5072fb030a6f600736d4627744d292757b2ca422 /drivers/nvmem | |
| parent | 897dfd346223fed415d7d7e6644982166a60e727 (diff) | |
| download | linux-d78f5d46fc2a43aae0d9509bcbcb495a7c67a54d.tar.xz | |
nvmem: core: fix device node refcounting
commit edcf2fb660526b5ed29f93bd17328a2b4835c8b2 upstream.
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.
Fixes: 69aba7948cbe ("nvmem: Add a simple NVMEM framework for consumers")
Fixes: 7ae6478b304b ("nvmem: core: rework nvmem cell instance creation")
Cc: stable@vger.kernel.org
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230127104015.23839-8-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/core.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index e92c6f1aadbb..cbe5df99db82 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1237,16 +1237,21 @@ 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); |