crypto: ansi_cprng - Fix off by one error in non-block size request
authorNeil Horman <nhorman@tuxdriver.com>
Tue, 17 Sep 2013 12:33:11 +0000 (08:33 -0400)
committerHerbert Xu <herbert@gondor.apana.org.au>
Mon, 23 Sep 2013 20:02:23 +0000 (06:02 +1000)
commit714b33d15130cbb5ab426456d4e3de842d6c5b8a
tree038690f74a44de6a5c6604e5732aa05633773e6f
parentec795ad84c0a8c69723972eae31e60b0d94ab29a
crypto: ansi_cprng - Fix off by one error in non-block size request

Stephan Mueller reported to me recently a error in random number generation in
the ansi cprng. If several small requests are made that are less than the
instances block size, the remainder for loop code doesn't increment
rand_data_valid in the last iteration, meaning that the last bytes in the
rand_data buffer gets reused on the subsequent smaller-than-a-block request for
random data.

The fix is pretty easy, just re-code the for loop to make sure that
rand_data_valid gets incremented appropriately

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Reported-by: Stephan Mueller <stephan.mueller@atsec.com>
CC: Stephan Mueller <stephan.mueller@atsec.com>
CC: Petr Matousek <pmatouse@redhat.com>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto/ansi_cprng.c