target/linux/generic/backport-5.10/805-v5.15-0003-nvmem-core-fix-error-handling-while-validating-keepo.patch

   1 From de0534df93474f268486c486ea7e01b44a478026 Mon Sep 17 00:00:00 2001
   2 From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
   3 Date: Fri, 6 Aug 2021 09:59:47 +0100
   4 Subject: [PATCH] nvmem: core: fix error handling while validating keepout
   5  regions
   6
   7 Current error path on failure of validating keepout regions is calling
   8 put_device, eventhough the device is not even registered at that point.
   9
  10 Fix this by adding proper error handling of freeing ida and nvmem.
  11
  12 Fixes: fd3bb8f54a88 ("nvmem: core: Add support for keepout regions")
  13 Cc: <stable@vger.kernel.org>
  14 Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
  15 Link: https://lore.kernel.org/r/20210806085947.22682-5-srinivas.kandagatla@linaro.org
  16 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  17 ---
  18  drivers/nvmem/core.c | 7 +++++--
  19  1 file changed, 5 insertions(+), 2 deletions(-)
  20
  21 --- a/drivers/nvmem/core.c
  22 +++ b/drivers/nvmem/core.c
  23 @@ -850,8 +850,11 @@ struct nvmem_device *nvmem_register(cons
  24
  25         if (nvmem->nkeepout) {
  26                 rval = nvmem_validate_keepouts(nvmem);
  27 -               if (rval)
  28 -                       goto err_put_device;
  29 +               if (rval) {
  30 +                       ida_free(&nvmem_ida, nvmem->id);
  31 +                       kfree(nvmem);
  32 +                       return ERR_PTR(rval);
  33 +               }
  34         }
  35
  36         dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);