Description of problem:
An incorrect allocation of object state tracking object in FSAL_RGW (nfs-ganesha RGW fs driver) leads to frequent, 2-byte overrun of the allocated object in several operations (e.g., rgw_setattr).

This may or may not be the root cause of a crash observed, once, in a heavy-mutation workload on a magna cluster.  It was obvserved trivially running RGW NFS under glibc AddressSanitizer.


Version-Release number of selected component (if applicable):
2.3

How reproducible:
100%

Steps to Reproduce:
1. run RGW NFS with AddressSanitizer
2. run heavy-mutation Crefi workload, e.g.
 for i in {create,rename,chmod,chown,truncate}; do ./crefi.py --fop $i --multi -b 10 -d 50 -n 50 -t text --random --min=1k --max=10k /hello/nfs/; done

Actual results:
ASAN stop

Expected results:
no stop