Core: Fix issues reported by Cppcheck

Fixed in this patch:

[glusterfs/extras/geo-rep/gsync-sync-gfid.c:105]: (error) Resource leak: fp
[glusterfs/libglusterfs/src/xlator.c:651]: (error) Uninitialized variable: gfid
[glusterfs/libglusterfs/src/xlator.c:652]: (error) Uninitialized variable: gfid
[glusterfs/xlators/cluster/ha/src/ha.c:2699]: (error) Possible null pointer dereference: priv
[glusterfs/xlators/features/changelog/src/changelog.c:1464]: (error) Possible null pointer dereference: priv
[glusterfs/xlators/mgmt/glusterd/src/glusterd-mgmt-handler.c:865]: (error) Possible null pointer dereference: ctx
[glusterfs/xlators/mgmt/glusterd/src/glusterd-mgmt-handler.c:194]: (error) Possible null pointer dereference: ctx
[glusterfs/xlators/mgmt/glusterd/src/glusterd-syncop.c:1408]: (error) Possible null pointer dereference: this
[glusterfs/xlators/mgmt/glusterd/src/glusterd-utils.c:7002]: (error) Possible null pointer dereference: path_tokens

Fixed in 3.4 and 3.5 branch (http://review.gluster.org/#/c/7583/ ,
http://review.gluster.org/#/c/7605/ will be backported in a separate patch)

[glusterfs/xlators/mount/fuse/src/fuse-bridge.c:4688]: (error) Uninitialized variable: finh
[glusterfs/xlators/mount/fuse/src/fuse-bridge.c:3081]: (error) Possible null pointer dereference: state
[glusterfs/xlators/cluster/dht/src/dht-rebalance.c:1719]: (error) Possible null pointer dereference: ctx
[glusterfs/xlators/cluster/stripe/src/stripe.c:4940]: (error) Possible null pointer dereference: local
[glusterfs/xlators/mgmt/glusterd/src/glusterd-replace-brick.c:915]: (error) Resource leak: file
[glusterfs/xlators/mgmt/glusterd/src/glusterd-replace-brick.c:999]: (error) Resource leak: file
[glusterfs/xlators/mgmt/glusterd/src/glusterd-sm.c:248]: (error) Possible null pointer dereference: new_ev_ctx
[glusterfs/xlators/mgmt/glusterd/src/glusterd-utils.c:5297]: (error) Possible null pointer dereference: this
[glusterfs/xlators/mgmt/glusterd/src/glusterd-utils.c:6273]: (error) Possible null pointer dereference: this
[glusterfs/xlators/performance/quick-read/src/quick-read.c:586]: (error) Possible null pointer dereference: iobuf
[glusterfs/xlators/nfs/server/src/nfs-common.c:89]: (error) Dangerous usage of 'volname' (strncpy doesn't always null-terminate it).

False positives

[glusterfs/geo-replication/src/gsyncd.c:99]: (error) Memory leak: str
[glusterfs/geo-replication/src/gsyncd.c:395]: (error) Memory leak: argv
[glusterfs/xlators/nfs/server/src/nlm4.c:1199]: (error) Possible null pointer dereference: fde
[glusterfs/xlators/mgmt/glusterd/src/glusterd-geo-rep.c:1659]: (error) Possible null pointer dereference: command
[glusterfs/xlators/mgmt/glusterd/src/glusterd-utils.c:7001]: (error) Possible null pointer dereference: path_tokens

Insignificant/Don't care

[glusterfs/contrib/uuid/gen_uuid.c:369]: (warning) %ld in format string (no. 2) requires 'long *' but the argument type is 'unsigned long *'.
[glusterfs/contrib/uuid/gen_uuid.c:369]: (warning) %ld in format string (no. 3) requires 'long *' but the argument type is 'unsigned long *'.
[glusterfs/extras/test/test-ffop.c:27]: (error) Buffer overrun possible for long command line arguments.
[glusterfs/xlators/cluster/afr/src/afr-self-heal-common.c:138]: (error) Possible null pointer dereference: __ptr
[glusterfs/xlators/cluster/afr/src/afr-self-heal-common.c:140]: (error) Possible null pointer dereference: __ptr
[glusterfs/xlators/cluster/afr/src/afr-self-heal-common.c:331]: (error) Possible null pointer dereference: __ptr

Change-Id: I7696ed1a2a9553b79f9714e10210a8d563a5abd8
BUG: 1091677
Signed-off-by: Lalatendu Mohanty <lmohanty@redhat.com>
Reviewed-on: http://review.gluster.org/7693
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

4 files changed, 23 insertions, 16 deletions

diff --git a/xlators/cluster/ha/src/ha.c b/xlators/cluster/ha/src/ha.c
index 3eccb516b65..742ec46f107 100644
--- a/xlators/cluster/ha/src/ha.c
+++ b/xlators/cluster/ha/src/ha.c
@@ -2694,7 +2694,12 @@ ha_statfs_cbk (call_frame_t *frame,
         ha_local_t   *local = NULL;
         ha_private_t *priv  = NULL;
 
+        GF_ASSERT (this);
+
         local = frame->local;
+        priv = this->private;
+        GF_ASSERT (priv);
+
         if (-1 == op_ret) {
                 local->active = (local->active + 1) % priv->child_count;
                 local->tries--;
@@ -2711,7 +2716,6 @@ ha_statfs_cbk (call_frame_t *frame,
  out:
         loc_wipe (&local->loc);
         STACK_UNWIND (frame, op_ret, op_errno, buf);
-        
 	return 0;
 }
 
diff --git a/xlators/features/changelog/src/changelog.c b/xlators/features/changelog/src/changelog.c
index 4ed7cc7f0e9..42292352b72 100644
--- a/xlators/features/changelog/src/changelog.c
+++ b/xlators/features/changelog/src/changelog.c
@@ -2039,20 +2039,21 @@ init (xlator_t *this)
 
  out:
         if (ret) {
-                if (this->local_pool)
+                if (this && this->local_pool)
                         mem_pool_destroy (this->local_pool);
-                if (priv->cb) {
-                        ret = priv->cb->dtor (this, &priv->cd);
-                        if (ret)
-                                gf_log (this->name, GF_LOG_ERROR,
+                if (priv) {
+                        if (priv->cb) {
+                                ret = priv->cb->dtor (this, &priv->cd);
+                                if (ret)
+                                        gf_log (this->name, GF_LOG_ERROR,
                                         "error in cleanup during init()");
+                        }
+                        GF_FREE (priv->changelog_brick);
+                        GF_FREE (priv->changelog_dir);
+                        if (cond_lock_init)
+                                changelog_pthread_destroy (priv);
+                        GF_FREE (priv);
                 }
-                GF_FREE (priv->changelog_brick);
-                GF_FREE (priv->changelog_dir);
-                if (cond_lock_init)
-                        changelog_pthread_destroy (priv);
-
-                GF_FREE (priv);
                 this->private = NULL;
         } else
                 this->private = priv;
diff --git a/xlators/mgmt/glusterd/src/glusterd-syncop.c b/xlators/mgmt/glusterd/src/glusterd-syncop.c
index 23824bd4ec3..1381edbab9d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-syncop.c
+++ b/xlators/mgmt/glusterd/src/glusterd-syncop.c
@@ -1362,6 +1362,8 @@ gd_unlock_op_phase (glusterd_conf_t  *conf, glusterd_op_t op, int *op_ret,
         struct list_head   *peers       = NULL;
 
         peers = &conf->xaction_peers;
+        this = THIS;
+        GF_ASSERT (this);
 
         if (!npeers) {
                 ret = 0;
@@ -1375,7 +1377,6 @@ gd_unlock_op_phase (glusterd_conf_t  *conf, glusterd_op_t op, int *op_ret,
                 goto out;
         }
 
-        this = THIS;
         synctask_barrier_init((&args));
         peer_cnt = 0;
         if (conf->op_version < GD_OP_VERSION_3_6_0) {
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index 8515320d894..94949e79111 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -8435,9 +8435,10 @@ glusterd_get_local_brickpaths (glusterd_volinfo_t *volinfo, char **pathlist)
 
         ret = count;
 out:
-        for (i = 0; i < count; i++) {
-                GF_FREE (path_tokens[i]);
-                path_tokens[i] = NULL;
+        if (path_tokens) {
+                for (i = 0; i < count; i++) {
+                        GF_FREE (path_tokens[i]);
+                }
         }
 
         GF_FREE (path_tokens);