crypto: authenc - Move saved IV in front of the ablkcipher request

In crypto_authenc_encrypt() we save the IV behind the ablkcipher
request. To save space on the request, we overwrite the ablkcipher
request with a ahash request after encryption. So the IV may be
overwritten by the ahash request. This patch fixes this by placing
the IV in front of the ablkcipher/ahash request.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 14 insertions, 11 deletions

diff --git a/crypto/authenc.c b/crypto/authenc.c
index 6287cfd4d7a0..2bb7348d8d55 100644
--- a/crypto/authenc.c
+++ b/crypto/authenc.c
@@ -386,11 +386,13 @@ static int crypto_authenc_encrypt(struct aead_request *req)
 {
         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
-        struct ablkcipher_request *abreq = aead_request_ctx(req);
+        struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
         struct crypto_ablkcipher *enc = ctx->enc;
         struct scatterlist *dst = req->dst;
         unsigned int cryptlen = req->cryptlen;
-        u8 *iv = (u8 *)(abreq + 1) + crypto_ablkcipher_reqsize(enc);
+        struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
+                                                    + ctx->reqoff);
+        u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
         int err;
 
         ablkcipher_request_set_tfm(abreq, enc);
@@ -546,10 +548,6 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
         if (IS_ERR(auth))
                 return PTR_ERR(auth);
 
-        ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
-                            crypto_ahash_alignmask(auth),
-                            crypto_ahash_alignmask(auth) + 1);
-
         enc = crypto_spawn_skcipher(&ictx->enc);
         err = PTR_ERR(enc);
         if (IS_ERR(enc))
@@ -558,13 +556,18 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
         ctx->auth = auth;
         ctx->enc = enc;
 
-        tfm->crt_aead.reqsize = max_t(unsigned int,
-                                crypto_ahash_reqsize(auth) + ctx->reqoff +
-                                sizeof(struct authenc_request_ctx) +
+        ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
+                            crypto_ahash_alignmask(auth),
+                            crypto_ahash_alignmask(auth) + 1) +
+                      crypto_ablkcipher_ivsize(enc);
+
+        tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) +
+                                ctx->reqoff +
+                                max_t(unsigned int,
+                                crypto_ahash_reqsize(auth) +
                                 sizeof(struct ahash_request),
                                 sizeof(struct skcipher_givcrypt_request) +
-                                crypto_ablkcipher_reqsize(enc) +
-                                crypto_ablkcipher_ivsize(enc));
+                                crypto_ablkcipher_reqsize(enc));
 
         return 0;