tree 0ff76eb4486bfa02708ea9a19d330b68bde83a81
parent 0c7281c0faa1d0bdbdc647430cbdf7e0aed7f385
author Herbert Xu <herbert@gondor.apana.org.au> 1219417446 +1000
committer Herbert Xu <herbert@gondor.apana.org.au> 1219417446 +1000

crypto: authenc - Avoid using clobbered request pointer

Authenc works in two stages for encryption, it first encrypts and
then computes an ICV.  The context memory of the request is used
by both operations.  The problem is that when an asynchronous
encryption completes, we will compute the ICV and then reread the
context memory of the encryption to get the original request.

It just happens that we have a buffer of 16 bytes in front of the
request pointer, so ICVs of 16 bytes (such as SHA1) do not trigger
the bug.  However, any attempt to uses a larger ICV instantly kills
the machine when the first asynchronous encryption is completed.

This patch fixes this by saving the request pointer before we start
the ICV computation.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>