crypto: pkcs1pad - comply with crypto_akcipher_maxsize()

crypto_akcipher_maxsize() asks for the output buffer size without
caring for errors. It allways assume that will be called after
a valid setkey. Comply with it and return what he wants.

crypto_akcipher_maxsize() now returns an unsigned int.
Remove the unnecessary check.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 2 insertions, 8 deletions

diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index 8baab4307f7b..044bcfa69cba 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -120,9 +120,6 @@ static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
 
         /* Find out new modulus size from rsa implementation */
         err = crypto_akcipher_maxsize(ctx->child);
-        if (err < 0)
-                return err;
-
         if (err > PAGE_SIZE)
                 return -ENOTSUPP;
 
@@ -144,9 +141,6 @@ static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
 
         /* Find out new modulus size from rsa implementation */
         err = crypto_akcipher_maxsize(ctx->child);
-        if (err < 0)
-                return err;
-
         if (err > PAGE_SIZE)
                 return -ENOTSUPP;
 
@@ -154,7 +148,7 @@ static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
         return 0;
 }
 
-static int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
+static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
 {
         struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
 
@@ -164,7 +158,7 @@ static int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
          * decrypt/verify.
          */
 
-        return ctx->key_size ?: -EINVAL;
+        return ctx->key_size;
 }
 
 static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,