target/linux/generic/backport-5.15/807-v6.1-0003-nvmem-core-add-error-handling-for-dev_set_name.patch

   1 From 5544e90c81261e82e02bbf7c6015a4b9c8c825ef Mon Sep 17 00:00:00 2001
   2 From: Gaosheng Cui <cuigaosheng1@huawei.com>
   3 Date: Fri, 16 Sep 2022 13:20:50 +0100
   4 Subject: [PATCH] nvmem: core: add error handling for dev_set_name
   5
   6 The type of return value of dev_set_name is int, which may return
   7 wrong result, so we add error handling for it to reclaim memory
   8 of nvmem resource, and return early when an error occurs.
   9
  10 Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
  11 Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
  12 Link: https://lore.kernel.org/r/20220916122100.170016-4-srinivas.kandagatla@linaro.org
  13 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  14 ---
  15  drivers/nvmem/core.c | 12 +++++++++---
  16  1 file changed, 9 insertions(+), 3 deletions(-)
  17
  18 --- a/drivers/nvmem/core.c
  19 +++ b/drivers/nvmem/core.c
  20 @@ -809,18 +809,24 @@ struct nvmem_device *nvmem_register(cons
  21
  22         switch (config->id) {
  23         case NVMEM_DEVID_NONE:
  24 -               dev_set_name(&nvmem->dev, "%s", config->name);
  25 +               rval = dev_set_name(&nvmem->dev, "%s", config->name);
  26                 break;
  27         case NVMEM_DEVID_AUTO:
  28 -               dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
  29 +               rval = dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
  30                 break;
  31         default:
  32 -               dev_set_name(&nvmem->dev, "%s%d",
  33 +               rval = dev_set_name(&nvmem->dev, "%s%d",
  34                              config->name ? : "nvmem",
  35                              config->name ? config->id : nvmem->id);
  36                 break;
  37         }
  38
  39 +       if (rval) {
  40 +               ida_free(&nvmem_ida, nvmem->id);
  41 +               kfree(nvmem);
  42 +               return ERR_PTR(rval);
  43 +       }
  44 +
  45         nvmem->read_only = device_property_present(config->dev, "read-only") ||
  46                            config->read_only || !nvmem->reg_write;
  47