shd/mux: Fix coverity issues introduced by shd mux patch

CID 1400475:  Null pointer dereferences  (FORWARD_NULL)
CID 1400474:  Null pointer dereferences  (FORWARD_NULL)
CID 1400471:  Code maintainability issues  (UNUSED_VALUE)
CID 1400470:  Null pointer dereferences  (FORWARD_NULL)
CID 1400469:  Memory - illegal accesses  (USE_AFTER_FREE)
CID 1400467:  Code maintainability issues  (UNUSED_VALUE)

Change-Id: I0ca1c733be335c6e5844f44850f8066626ac40d4
updates: bz#789278
Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com>

3 files changed, 36 insertions, 15 deletions

diff --git a/libglusterfs/src/graph.c b/libglusterfs/src/graph.c
index 74b568441af..85b470dfeaa 100644
--- a/libglusterfs/src/graph.c
+++ b/libglusterfs/src/graph.c
@@ -1461,7 +1461,9 @@ glusterfs_process_svc_detach(glusterfs_ctx_t *ctx, gf_volfile_t *volfile_obj)
         goto out;
     parent_graph = ctx->active;
     graph = volfile_obj->graph;
-    if (graph && graph->first)
+    if (!graph)
+        goto out;
+    if (graph->first)
         xl = graph->first;
 
     last_xl = graph->last_xl;
@@ -1582,12 +1584,10 @@ glusterfs_process_svc_attach_volfp(glusterfs_ctx_t *ctx, FILE *fp,
     parent_graph->leaf_count += graph->leaf_count;
     parent_graph->id++;
 
+    volfile_obj = GF_CALLOC(1, sizeof(gf_volfile_t), gf_common_volfile_t);
     if (!volfile_obj) {
-        volfile_obj = GF_CALLOC(1, sizeof(gf_volfile_t), gf_common_volfile_t);
-        if (!volfile_obj) {
-            ret = -1;
-            goto out;
-        }
+        ret = -1;
+        goto out;
     }
 
     graph->used = 1;
@@ -1632,6 +1632,7 @@ glusterfs_mux_volfile_reconfigure(FILE *newvolfile_fp, glusterfs_ctx_t *ctx,
 {
     glusterfs_graph_t *oldvolfile_graph = NULL;
     glusterfs_graph_t *newvolfile_graph = NULL;
+    char vol_id[NAME_MAX + 1];
 
     int ret = -1;
 
@@ -1663,6 +1664,9 @@ glusterfs_mux_volfile_reconfigure(FILE *newvolfile_fp, glusterfs_ctx_t *ctx,
     glusterfs_graph_prepare(newvolfile_graph, ctx, newvolfile_graph->first);
 
     if (!is_graph_topology_equal(oldvolfile_graph, newvolfile_graph)) {
+        ret = snprintf(vol_id, sizeof(vol_id), "%s", volfile_obj->vol_id);
+        if (ret < 0)
+            goto out;
         ret = glusterfs_process_svc_detach(ctx, volfile_obj);
         if (ret) {
             gf_msg("glusterfsd-mgmt", GF_LOG_ERROR, EINVAL,
@@ -1671,8 +1675,9 @@ glusterfs_mux_volfile_reconfigure(FILE *newvolfile_fp, glusterfs_ctx_t *ctx,
                    "old graph. Aborting the reconfiguration operation");
             goto out;
         }
-        ret = glusterfs_process_svc_attach_volfp(ctx, newvolfile_fp,
-                                                 volfile_obj->vol_id, checksum);
+        volfile_obj = NULL;
+        ret = glusterfs_process_svc_attach_volfp(ctx, newvolfile_fp, vol_id,
+                                                 checksum);
         goto out;
     }
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-shd-svc.c b/xlators/mgmt/glusterd/src/glusterd-shd-svc.c
index 47898434380..19eca9f2729 100644
--- a/xlators/mgmt/glusterd/src/glusterd-shd-svc.c
+++ b/xlators/mgmt/glusterd/src/glusterd-shd-svc.c
@@ -101,6 +101,8 @@ glusterd_shdsvc_init(void *data, glusterd_conn_t *mux_conn,
         svc->conn.rpc = rpc_clnt_ref(mux_svc->rpc);
         ret = snprintf(svc->conn.sockpath, sizeof(svc->conn.sockpath), "%s",
                        mux_conn->sockpath);
+        if (ret < 0)
+            goto out;
     } else {
         ret = mkdir_p(logdir, 0755, _gf_true);
         if ((ret == -1) && (EEXIST != errno)) {
@@ -673,6 +675,10 @@ glusterd_shdsvc_stop(glusterd_svc_t *svc, int sig)
         glusterd_volinfo_ref(volinfo);
         svc_proc->data = volinfo;
         ret = glusterd_svc_stop(svc, sig);
+        if (ret) {
+            glusterd_volinfo_unref(volinfo);
+            goto out;
+        }
     }
     if (!empty && pid != -1) {
         ret = glusterd_detach_svc(svc, volinfo, sig);
diff --git a/xlators/mgmt/glusterd/src/glusterd-svc-helper.c b/xlators/mgmt/glusterd/src/glusterd-svc-helper.c
index e42703c0f41..02945b1e313 100644
--- a/xlators/mgmt/glusterd/src/glusterd-svc-helper.c
+++ b/xlators/mgmt/glusterd/src/glusterd-svc-helper.c
@@ -411,9 +411,14 @@ __gf_find_compatible_svc(gd_node_type daemon)
     conf = THIS->private;
     GF_VALIDATE_OR_GOTO("glusterd", conf, out);
 
-    if (daemon == GD_NODE_SHD) {
-        svc_procs = &conf->shd_procs;
-        if (!svc_procs)
+    switch (daemon) {
+        case GD_NODE_SHD: {
+            svc_procs = &conf->shd_procs;
+            if (!svc_procs)
+                goto out;
+        } break;
+        default:
+            /* Add support for other client daemons here */
             goto out;
     }
 
@@ -540,11 +545,16 @@ __gf_find_compatible_svc_from_pid(gd_node_type daemon, pid_t pid)
     if (!conf)
         return NULL;
 
-    if (daemon == GD_NODE_SHD) {
-        svc_procs = &conf->shd_procs;
-        if (!svc_proc)
+    switch (daemon) {
+        case GD_NODE_SHD: {
+            svc_procs = &conf->shd_procs;
+            if (!svc_procs)
+                return NULL;
+        } break;
+        default:
+            /* Add support for other client daemons here */
             return NULL;
-    } /* Can be moved to switch when mux is implemented for other daemon; */
+    }
 
     cds_list_for_each_entry(svc_proc, svc_procs, svc_proc_list)
     {