[Bugs] [Bug 1235904] New: fgetxattr() crashes when key name is NULL

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1235904

            Bug ID: 1235904
           Summary: fgetxattr() crashes when key name is NULL
           Product: GlusterFS
           Version: 3.7.2
         Component: posix
          Assignee: bugs at gluster.org
          Reporter: ppai at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:

fgetxattr() crashes when key name is NULL

Version-Release number of selected component (if applicable):
3.7.x branch

This is used to get the size of xattr list (to later allocate buffer):
glfs_flistxattr(glfd, NULL, 0);
glfs_flistxattr() internally has the following call:
syncop_fgetxattr (subvol, fd, &xattr, NULL, NULL, NULL);
strncmp() segfaults as name is NULL in posix_fgetxattr()

Actual results:
SEGFAULT

Expected results:
No crash

Additional info:
This coverity fix that's in master was missed (not backported) from 3.7.x
branch.

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