cluster/dht: Fix memory corruption while accessing regex stored in

private

If reconfigure is executed parallely (or concurrently with dht_init),
there are races that can corrupt memory. One such race is modification
of regexes stored in conf (conf->rsync_regex_valid and
conf->extra_regex_valid) through dht_init_regex. With change [1],
reconfigure codepath can get executed parallely (with itself or with
dht_init) and this fix is needed.

Also, a reconfigure can race with any thread doing dht_layout_search,
resulting in dht_layout_search accessing regex freed up by reconfigure
(like in bz 1399134).

[1] http://review.gluster.org/15046

>Change-Id: I039422a65374cf0ccbe0073441f0e8c442ebf830
>BUG: 1399134
>Signed-off-by: Raghavendra G <rgowdapp@redhat.com>
>Reviewed-on: http://review.gluster.org/15945
>Smoke: Gluster Build System <jenkins@build.gluster.org>
>NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
>Reviewed-by: N Balachandran <nbalacha@redhat.com>
>CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
>Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>

Change-Id: I039422a65374cf0ccbe0073441f0e8c442ebf830
BUG: 1399422
Signed-off-by: Raghavendra G <rgowdapp@redhat.com>
(cherry picked from commit 64451d0f25e7cc7aafc1b6589122648281e4310a)
Reviewed-on: http://review.gluster.org/15949
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>

0 files changed, 0 insertions, 0 deletions