OpenAFS Master Repository branch, master, updated. BP-openafs-stable-1_8_x-21-g894555f

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit 894555f93a2571146cb9ca07140eb98c7a424b01
Author: Benjamin Kaduk <kaduk@mit.edu>
Date:   Mon Dec 4 17:20:57 2017 -0600

    OPENAFS-SA-2017-001: rx: Sanity-check received MTU and twind values
    
    Rather than blindly trusting the values received in the
    (unauthenticated) ack packet trailer, apply some minmial sanity checks
    to received values.  natMTU and regular MTU values are subject to
    Rx minmium/maximum packet sizes, and the transmit window cannot drop
    below one without risk of deadlock.
    
    The maxDgramPackets value that can also be present in the trailer
    already has sufficient sanity checking.
    
    Extremely low MTU values (less than 28 == RX_HEADER_SIZE) can cause us
    to set a negative "maximum usable data" size that gets used as an
    (unsigned) packet length for subsequent allocation and computation,
    triggering an assertion when the connection is used to transmit data.
    
    FIXES 134450
    
    Change-Id: I37698ff166da47a57aa0d1962ae8effc74e30851

 src/rx/rx.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

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