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Created attachment 652644 [details]
Proposed patch

Description of problem:

When object_key_increment or _decrement is called on [u]int16 value,
uninitialized value is read as result value.

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

How reproducible:
100%

Steps to Reproduce:
1. Store [u]int16 value in confdb
2. Call object_key_increment on this key
3. valgrind will tell about access to uninitialized memory. From time to time, returned value (last parameter of object_key_increment) can be unexpected value.
  
Actual results:
Read of uninitialized value

Expected results:
No read of uninitialized value

Additional info:
"Unit test":
https://github.com/jfriesse/csts/blob/master/tests/confdb-incdec.sh

Verified using confdb-incdec.sh:

FAIL on corosync-1.4.1-15.el6.x86_64 (RHEL6.4) (/root/csts-apps/confdb-incdec.c:68: incdec: Assertion `res == i16inc' failed)
PASS on corosync-1.4.1-17.el6.x86_64 (RHEL6.5)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-1531.html