Description of problem:

In FIPS mode, curl segfaults when downloading via scp (see details below). 

Version-Release number of selected component (if applicable):

curl-7.19.7-37.el6_4

How reproducible:

100%

Steps to Reproduce:

1. add curltestuser account
   # useradd -m curltestuser
2. create a test file
   # su - curltestuser -c 'dd if=/dev/zero of=testfile bs=1M count=200'
3. Create ssh key (for FIPS you need RSA with more than 1024 bits)
   # ssh-keygen -t rsa -f /root/.ssh/id_rsa -N ''
   # mkdir /home/curltestuser/.ssh
   # cat /root/.ssh/id_rsa.pub > /home/curltestuser/.ssh/authorized_keys 
   # chown -R curltestuser.curltestuser /home/curltestuser/.ssh/
4. Initiate curl scp download
   # curl -v -o ./scp_file -u curltestuser: --key /root/.ssh/id_rsa \
     --pubkey /root/.ssh/id_rsa.pub scp://localhost/home/curltestuser

Actual results:

* About to connect() to localhost port 22 (#0)
*   Trying ::1... connected
* Connected to localhost (::1) port 22 (#0)
* Failed to read known hosts from /root/.ssh/known_hosts
Segmentation fault (core dumped)

Expected results:

Successful download.

Additional info:

This is not happening in a non-FIPS mode, where scp download works flawlessly.

Output from 'strace -f' is attached.