cluster/dht: Fix crash in dht rmdir

Using local->call_cnt to check STACK_WINDs can
cause dht_rmdir_do to be called erroneously if
dht_rmdir_readdirp_cbk unwinds before we check if
local->call_cnt is zero in dht_rmdir_opendir_cbk.
This can cause frame corruptions and crashes.

Thanks to Shyam (srangana@redhat.com) for the
analysis.

> BUG: 1451083
> Signed-off-by: N Balachandran <nbalacha@redhat.com>
> Reviewed-on: https://review.gluster.org/17305
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
(cherry picked from commit 6f7d55c9d58797beaf8d5393c03a5a545bed8bec)
Change-Id: I5362cf78f97f21b3fade0b9e94d492002a8d4a11
BUG: 1451586
Signed-off-by: N Balachandran <nbalacha@redhat.com>
Reviewed-on: https://review.gluster.org/17314
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>

0 files changed, 0 insertions, 0 deletions