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: [email protected]
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 <[email protected]>
Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Jarkko Sakkinen <[email protected]>
Signed-off-by: Jarkko Sakkinen <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Khalid Elmously <[email protected]>

Author: ebiggers

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;