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[PATCH 0/5] refactor mpi_read_from_buffer()

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mpi_read_from_buffer() and mpi_read_raw_data() do almost the same and share a
fair amount of common code.

This patchset attempts to rewrite mpi_read_from_buffer() in order to implement
it in terms of mpi_read_raw_data().

The patches 1 and 3, i.e.
  "lib/mpi: mpi_read_from_buffer(): return error code"
and
  "lib/mpi: mpi_read_from_buffer(): return -EINVAL upon too short buffer"
do the groundwork in that they move any error detection unique to
mpi_read_from_buffer() out of the data handling loop.

The patches 2 and 4, that is
  "lib/digsig: digsig_verify_rsa(): return -EINVAL if modulo length is zero"
and
  "lib/mpi: mpi_read_from_buffer(): sanitize short buffer printk"
are not strictly necessary for the refactoring: they cleanup some minor oddities
related to error handling I came across.

Finally, the last patch in this series,
  "lib/mpi: refactor mpi_read_from_buffer() in terms of mpi_read_raw_data()"
actually does what this series is all about.


Applicable to linux-next-20160325.

A note on testing: allmodconfig on x86_64 builds fine. 
However, the only caller of mpi_read_from_buffer() is digsig_verify_rsa()
and this one is solely used by the IMA/EVM infrastructure.
In my current setup, I don't have any IMA/EVM stuff in place and thus,
I can't do any runtime tests without putting *much* effort into it.
I would really appreciate if someone with a working IMA/EVM setup could do some
brief testing...

Nicolai Stange (5):
  lib/mpi: mpi_read_from_buffer(): return error code
  lib/digsig: digsig_verify_rsa(): return -EINVAL if modulo length is
    zero
  lib/mpi: mpi_read_from_buffer(): return -EINVAL upon too short buffer
  lib/mpi: mpi_read_from_buffer(): sanitize short buffer printk
  lib/mpi: refactor mpi_read_from_buffer() in terms of
    mpi_read_raw_data()

 lib/digsig.c       | 16 +++++++++++-----
 lib/mpi/mpicoder.c | 46 +++++++++++++---------------------------------
 2 files changed, 24 insertions(+), 38 deletions(-)

-- 
2.8.2

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[PATCH 0/5] refactor mpi_read_from_buffer() Nicolai Stange <nicstange@gmail.com> - 2016-05-26 23:30 +0200
  [PATCH 4/5] lib/mpi: mpi_read_from_buffer(): sanitize short buffer printk Nicolai Stange <nicstange@gmail.com> - 2016-05-26 23:30 +0200
  [PATCH 5/5] lib/mpi: refactor mpi_read_from_buffer() in terms of mpi_read_raw_data() Nicolai Stange <nicstange@gmail.com> - 2016-05-26 23:30 +0200

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