KEYS: asymmetric: return ENOMEM if akcipher_request_alloc() fails

BugLink: https://bugs.launchpad.net/bugs/1860490

commit bea3741 upstream.

No error code was being set on this error path.

Cc: stable@vger.kernel.org
Fixes: ad4b1eb ("KEYS: asym_tpm: Implement encryption operation [ver #2]")
Fixes: c08fed7 ("KEYS: Implement encrypt, decrypt and sign for software asymmetric key [ver #2]")
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

crypto/asymmetric_keys/asym_tpm.c

@@ -486,6 +486,7 @@ static int tpm_key_encrypt(struct tpm_key *tk,
  if (ret < 0)
  goto error_free_tfm;
 
+ ret = -ENOMEM;
  req = akcipher_request_alloc(tfm, GFP_KERNEL);
  if (!req)
  goto error_free_tfm;

crypto/asymmetric_keys/public_key.c

@@ -184,6 +184,7 @@ static int software_key_eds_op(struct kernel_pkey_params *params,
  if (IS_ERR(tfm))
  return PTR_ERR(tfm);
 
+ ret = -ENOMEM;
  req = akcipher_request_alloc(tfm, GFP_KERNEL);
  if (!req)
  goto error_free_tfm;