crypto: marvell/cesa - initialise struct mv_cesa_ahash_req

When a AF_ALG fd is accepted a second time (hence hash_accept() is
used), hash_accept_parent() allocates a new private context using
sock_kmalloc().  This context is uninitialised.  After use of the new
fd, we eventually end up with the kernel complaining:

marvell-cesa f1090000.crypto: dma_pool_free cesa_padding, c0627770/0 (bad dma)

where c0627770 is a random address.  Poisoning the memory allocated by
the above sock_kmalloc() produces kernel oopses within the marvell hash
code, particularly the interrupt handling.

The following simplfied call sequence occurs:

hash_accept()
  crypto_ahash_export()
    marvell hash export function
  af_alg_accept()
    hash_accept_parent()	<== allocates uninitialised struct hash_ctx
  crypto_ahash_import()
    marvell hash import function

hash_ctx contains the struct mv_cesa_ahash_req in its req.__ctx member,
and, as the marvell hash import function only partially initialises
this structure, we end up with a lot of members which are left with
whatever data was in memory prior to sock_kmalloc().

Add zero-initialisation of this structure.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Boris Brezillon <boris.brezillon@free-electronc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/marvell/hash.c

@@ -833,6 +833,10 @@ static int mv_cesa_md5_import(struct ahash_request *req, const void *in)
 	unsigned int cache_ptr;
 	int ret;
 
+	ret = crypto_ahash_init(req);
+	if (ret)
+		return ret;
+
 	creq->len = in_state->byte_count;
 	memcpy(creq->state, in_state->hash, digsize);
 	creq->cache_ptr = 0;
@@ -923,6 +927,10 @@ static int mv_cesa_sha1_import(struct ahash_request *req, const void *in)
 	unsigned int cache_ptr;
 	int ret;
 
+	ret = crypto_ahash_init(req);
+	if (ret)
+		return ret;
+
 	creq->len = in_state->count;
 	memcpy(creq->state, in_state->state, digsize);
 	creq->cache_ptr = 0;
@@ -1024,6 +1032,10 @@ static int mv_cesa_sha256_import(struct ahash_request *req, const void *in)
 	unsigned int cache_ptr;
 	int ret;
 
+	ret = crypto_ahash_init(req);
+	if (ret)
+		return ret;
+
 	creq->len = in_state->count;
 	memcpy(creq->state, in_state->state, digsize);
 	creq->cache_ptr = 0;