[Bugs] [Bug 1221008] New: libgfapi: Segfault when glfs_*() invoked in invalid glfd

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1221008

            Bug ID: 1221008
           Summary: libgfapi: Segfault when glfs_*() invoked in invalid
                    glfd
           Product: GlusterFS
           Version: mainline
         Component: libgfapi
          Severity: low
          Assignee: bugs at gluster.org
          Reporter: ppai at redhat.com
        QA Contact: sdharane at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
When glfs_* methods operating on glfd are invoked after calling
glfs_close(), the program segfaults inside __GLFS_ENTRY_VALIDATE_FD
trying to deference glfd->fd->inode which is invalid.

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


Steps to Reproduce (Example using python binding)
#!/usr/bin/env python

from glusterfs import gfapi
import os

v = gfapi.Volume("pp", "real")
v.mount()
f = v.open("file", os.O_RDONLY) # assuming file exists
f.close()
f.read() # This will segfault


Actual results:
Segfault with code dump

Expected results:
Gracefully exit with errno set to EBADF

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