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    crypto: crct10dif-generic - fix use via crypto_shash_digest() · 7a19a4be
    Eric Biggers authored
    commit 307508d1 upstream.
    
    The ->digest() method of crct10dif-generic reads the current CRC value
    from the shash_desc context.  But this value is uninitialized, causing
    crypto_shash_digest() to compute the wrong result.  Fix it.
    
    Probably this wasn't noticed before because lib/crc-t10dif.c only uses
    crypto_shash_update(), not crypto_shash_digest().  Likewise,
    crypto_shash_digest() is not yet tested by the crypto self-tests because
    those only test the ahash API which only uses shash init/update/final.
    
    This bug was detected by my patches that improve testmgr to fuzz
    algorithms against their generic implementation.
    
    Fixes: 2d31e518
    
     ("crypto: crct10dif - Wrap crc_t10dif function all to use crypto transform framework")
    Cc: <stable@vger.kernel.org> # v3.11+
    Cc: Tim Chen <tim.c.chen@linux.intel.com>
    Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    7a19a4be