crypto: marvell/cesa - initialise struct mv_cesa_ahash_req
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 <f6aa0246ff943bfa8602cdf60d40c481b38ed232@arm.linux.org.uk>
Acked-by: Boris Brezillon <4e91513d4f418754031d3d36b3fc73980c40a38c@free-electronc.com>
Signed-off-by: Herbert Xu <ef65de1c7be0aa837fe7b25ba9a7739905af6a55@gondor.apana.org.au>

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