AX.25 and NET/ROM fixes and improvments.

AX.25 ioctl didn't do sufficient argument checking. The result of these overflows is harmless as it will be dealt with further further down in the stack but an application should get an error code when trying to set such a bogus value. To not restrict the more extreme use cases of AX.25 there is no attempt to clamp values to a "sensible" range.

The NET/ROM stack's routing ioctl didn't check the lengths of the mnemonic string that is being passed as part of the nr_route_struct structure to the kernel. In theory this could result in an oops but no memory corruption but again is fairly harmless because it requires CAP_NET_ADMIN priviledges which in practice only root has and ax25-tools don't send malformed ioctls.

Two further patches simplify the checks at the beginning of nr_rt_ioctl and do minor reformatting to nr_ioctl.

Patches 1 and 2 are meant for v3.2; 3 and 4 are only cosmetic and thus are v3.3 material.

Ralf Baechle (4):
NET: AX.25: Check ioctl arguments to avoid overflows further down the
road.
NET: NETROM: When adding a route verify length of mnemonic string.
NET: NETROM: Cleanup argument SIOCADDRT ioctl argument checking.
NET: NETROM: Fix formatting.

 net/ax25/af_ax25.c     |   17 +++++++++++------
 net/netrom/af_netrom.c |    3 ++-
 net/netrom/nr_route.c  |   11 +++++++----
 3 files changed, 20 insertions(+), 11 deletions(-)

1.7.4.4