glusterd/cli: coverity fixes

Backport of http://review.gluster.org/#/c/14818/

A downstream coverity run has revealed few of the following coverity defects.
Since the downstream code is a clone of a specific upstream branch the defects
hold true for the upstream as well.

Defect type: NEGATIVE_RETURNS
xlators/mgmt/glusterd/src/glusterd-rpc-ops.c:641: negative_returns: "op_errno"
is passed to a parameter that cannot be negative.

Defect type: BUFFER_SIZE_WARNING
xlators/mgmt/glusterd/src/glusterd-volume-ops.c:2124: buffer_size_warning:
Calling strncpy with a maximum size argument of 261 bytes on destination array
"volinfo->volname" of size 261 bytes might leave the destination string
unterminated.

Defect type: BUFFER_SIZE_WARNING
xlators/mgmt/glusterd/src/glusterd-volgen.c:4888: buffer_size_warning: Calling
strncpy with a maximum size argument of 261 bytes on destination array
"volinfo->volname" of size 261 bytes might leave the destination string
unterminated.

Defect type: STRING_OVERFLOW
xlators/mgmt/glusterd/src/glusterd-volgen.c:3449: string_overflow: You might
overrun the 256 byte destination string "tmp_volname" by writing 261 bytes from
"volinfo->volname".

Defect type: BUFFER_SIZE_WARNING
xlators/mgmt/glusterd/src/glusterd-utils.c:3392: buffer_size_warning: Calling
strncpy with a maximum size argument of 261 bytes on destination array
"new_volinfo->volname" of size 261 bytes might leave the destination string
unterminated.

Defect type: NO_EFFECT
xlators/mgmt/glusterd/src/glusterd-utils.c:7359: remediation: Was
"rebal->rebalance_id" formerly declared as a pointer?

Defect type: USE_AFTER_FREE
xlators/mgmt/glusterd/src/glusterd-utils.c:7115: pass_freed_arg: Passing freed
pointer "volinfo" as an argument to "glusterd_friend_contains_vol_bricks".

Defect type: DEADCODE
cli/src/cli-cmd-parser.c:1767: dead_error_begin: Execution cannot reach this
statement: "ret = -1;".

Change-Id: Ie941bdf31923e2f39618dd94bfae16fdb3ad65f1
BUG: 1352281
Signed-off-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-on: http://review.gluster.org/14818
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: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: http://review.gluster.org/14850
Reviewed-by: Prashanth Pai <ppai@redhat.com>

4 files changed, 21 insertions, 19 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c b/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c
index f7e8cfe248c..73646ec4bfc 100644
--- a/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c
@@ -559,7 +559,7 @@ __glusterd_friend_remove_cbk (struct rpc_req * req, struct iovec *iov,
         glusterd_friend_sm_event_type_t event_type = GD_FRIEND_EVENT_NONE;
         glusterd_peerinfo_t             *peerinfo = NULL;
         int32_t                         op_ret = -1;
-        int32_t                         op_errno = -1;
+        int32_t                         op_errno = 0;
         glusterd_probe_ctx_t            *ctx = NULL;
         gf_boolean_t                    move_sm_now = _gf_true;
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index 454ffdc5603..682a403a45f 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -3455,7 +3455,7 @@ glusterd_import_volinfo (dict_t *peer_data, int count,
         ret = glusterd_volinfo_new (&new_volinfo);
         if (ret)
                 goto out;
-        strncpy (new_volinfo->volname, volname, sizeof (new_volinfo->volname));
+        strncpy (new_volinfo->volname, volname, strlen (volname));
 
         memset (key, 0, sizeof (key));
         snprintf (key, sizeof (key), "%s%d.type", prefix, count);
@@ -7129,19 +7129,6 @@ glusterd_friend_remove_cleanup_vols (uuid_t uuid)
 
         cds_list_for_each_entry_safe (volinfo, tmp_volinfo, &priv->volumes,
                                       vol_list) {
-                if (glusterd_friend_contains_vol_bricks (volinfo, uuid) == 2) {
-                        gf_msg (THIS->name, GF_LOG_INFO, 0,
-                                GD_MSG_STALE_VOL_DELETE_INFO,
-                                "Deleting stale volume %s", volinfo->volname);
-                        ret = glusterd_delete_volume (volinfo);
-                        if (ret) {
-                                gf_msg (THIS->name, GF_LOG_ERROR, 0,
-                                        GD_MSG_STALE_VOL_REMOVE_FAIL,
-                                        "Error deleting stale volume");
-                                goto out;
-                        }
-                }
-
                 if (!glusterd_friend_contains_vol_bricks (volinfo,
                                                           MY_UUID)) {
                         /*Stop snapd daemon service if snapd daemon is running*/
@@ -7155,6 +7142,20 @@ glusterd_friend_remove_cleanup_vols (uuid_t uuid)
                                 }
                         }
                 }
+
+                if (glusterd_friend_contains_vol_bricks (volinfo, uuid) == 2) {
+                        gf_msg (THIS->name, GF_LOG_INFO, 0,
+                                GD_MSG_STALE_VOL_DELETE_INFO,
+                                "Deleting stale volume %s", volinfo->volname);
+                        ret = glusterd_delete_volume (volinfo);
+                        if (ret) {
+                                gf_msg (THIS->name, GF_LOG_ERROR, 0,
+                                        GD_MSG_STALE_VOL_REMOVE_FAIL,
+                                        "Error deleting stale volume");
+                                goto out;
+                        }
+                }
+
         }
 
         /* Reconfigure all daemon services upon peer detach */
@@ -7386,7 +7387,7 @@ glusterd_defrag_info_set (glusterd_volinfo_t *volinfo, dict_t *dict, int cmd,
         rebal->defrag_status = status;
         rebal->op = op;
 
-        if (!rebal->rebalance_id)
+        if (gf_uuid_is_null (rebal->rebalance_id))
                 return;
 
         if (is_origin_glusterd (dict)) {
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index ac9a4def054..7d263b43aeb 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -3529,7 +3529,8 @@ build_distribute:
                 goto out;
         }
         if (volinfo->tier_info.hot_brick_count) {
-                strcpy (tmp_volname, volinfo->volname);
+                strncpy (tmp_volname, volinfo->volname,
+                         strlen (volinfo->volname));
                 if (volinfo->tier_info.cur_tier_hot)
                         strcat (volinfo->volname, "-hot");
                 else
@@ -4958,7 +4959,7 @@ glusterd_is_valid_volfpath (char *volname, char *brick)
                 ret = 0;
                 goto out;
         }
-        strncpy (volinfo->volname, volname, sizeof (volinfo->volname));
+        strncpy (volinfo->volname, volname, strlen (volname));
         get_brick_filepath (volfpath, volinfo, brickinfo, NULL);
 
         ret = ((strlen(volfpath) < PATH_MAX) &&
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
index 60577505cfc..72e14b0429d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
@@ -2156,7 +2156,7 @@ glusterd_op_create_volume (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-        strncpy (volinfo->volname, volname, sizeof(volinfo->volname));
+        strncpy (volinfo->volname, volname, strlen (volname));
         GF_ASSERT (volinfo->volname);
 
         ret = dict_get_int32 (dict, "type", &volinfo->type);