crypto: drbg - wait for crypto op not signal safe
authorGilad Ben-Yossef <gilad@benyossef.com>
Thu, 18 May 2017 13:29:24 +0000 (16:29 +0300)
committerHerbert Xu <herbert@gondor.apana.org.au>
Tue, 23 May 2017 04:45:11 +0000 (12:45 +0800)
commita5dfefb1c3f3db81662556393fd9283511e08430
tree34d6e7ae619ec2d574edb548bce8831b22f8c247
parente68368aed56324e2e38d4f6b044bb8cf82077fc2
crypto: drbg - wait for crypto op not signal safe

drbg_kcapi_sym_ctr() was using wait_for_completion_interruptible() to
wait for completion of async crypto op but if a signal occurs it
may return before DMA ops of HW crypto provider finish, thus
corrupting the output buffer.

Resolve this by using wait_for_completion() instead.

Reported-by: Eric Biggers <ebiggers3@gmail.com>
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
CC: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto/drbg.c