From: Tudor-Dan Ambarus <tudor.ambarus@microchip.com>
Date: Thu, 25 May 2017 07:18:14 +0000 (+0300)
Subject: crypto: caampkc - comply with crypto_akcipher_maxsize()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e198429c41edaeaf5e1e2e2ef4bb5a476d8bf399;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

crypto: caampkc - 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.

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

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index 57f399caa977..9c508ba6b0f1 100644
--- a/drivers/crypto/caam/caampkc.c
+++ b/drivers/crypto/caam/caampkc.c
@@ -911,12 +911,11 @@ err:
 	return -ENOMEM;
 }
 
-static int caam_rsa_max_size(struct crypto_akcipher *tfm)
+static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
 {
 	struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
-	struct caam_rsa_key *key = &ctx->key;
 
-	return (key->n) ? key->n_sz : -EINVAL;
+	return ctx->key.n_sz;
 }
 
 /* Per session pkc's driver context creation function */