coverity: Multiple coverity fixes for issues with HIGH severity

glfs-fops.c
1391414 Uninitialized pointer read
List head needed initialization

glusterfsd-mgmt.c
graph.c
1382431 Buffer not null terminated
1382417 Dereference before null check
1382347 Buffer not null terminated
Cleaned usage of volfile_checksum member of gf_volfile_t struct
across the code base.

glusterd-tier.c
1382426 Resource leak
1370955 Dereference before null check
The function fixed needs more work, but with tier almost being
deprecated, addressed some parts of the reported coverity issues
as appropriate.

Tested using the following test cases:
./tests/basic/tier/new-tier-cmds.t
./tests/basic/tier/tier.t
./tests/basic/tier/bug-1214222-directories_missing_after_attach_tier.t
./tests/basic/tier/tier_lookup_heal.t
./tests/basic/tier/tier-heald.t
./tests/basic/tier/tier-snapshot.t
./tests/features/glfs-lease.t

Change-Id: I396f1c34bb112bb22d2745ed279e1a4850cac4af
Updates: bz#789278
Signed-off-by: ShyamsundarR <srangana@redhat.com>

1 files changed, 27 insertions, 25 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-tier.c b/xlators/mgmt/glusterd/src/glusterd-tier.c
index 608b035fa16..d20f6900b21 100644
--- a/xlators/mgmt/glusterd/src/glusterd-tier.c
+++ b/xlators/mgmt/glusterd/src/glusterd-tier.c
@@ -1245,18 +1245,17 @@ int
 glusterd_op_tier_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict,
                          glusterd_op_t op)
 {
-        int                             ret       = -1;
+        int                              ret       = -1;
         xlator_t                        *this     = NULL;
-        struct syncargs                 args = {0, };
-        glusterd_req_ctx_t              *data   = NULL;
+        struct syncargs                  args = {0, };
         gd1_mgmt_brick_op_req           *req = NULL;
         glusterd_conf_t                 *priv = NULL;
-        int                             pending_bricks = 0;
+        int                              pending_bricks = 0;
         glusterd_pending_node_t         *pending_node;
         glusterd_req_ctx_t              *req_ctx = NULL;
         struct rpc_clnt                 *rpc = NULL;
         uuid_t                          *txn_id = NULL;
-        extern                          glusterd_op_info_t opinfo;
+        extern                           glusterd_op_info_t opinfo;
 
         this = THIS;
         GF_VALIDATE_OR_GOTO (THIS->name, this, out);
@@ -1267,10 +1266,15 @@ glusterd_op_tier_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict,
         GF_VALIDATE_OR_GOTO (this->name, priv, out);
         args.op_ret = -1;
         args.op_errno = ENOTCONN;
-        data = GF_CALLOC (1, sizeof (*data),
-                        gf_gld_mt_op_allack_ctx_t);
 
-        gf_uuid_copy (data->uuid, MY_UUID);
+        req_ctx = GF_MALLOC (sizeof (*req_ctx), gf_gld_mt_op_allack_ctx_t);
+        if (!req_ctx) {
+                gf_msg (this->name, GF_LOG_ERROR, ENOMEM,
+                        GD_MSG_NO_MEMORY, "Allocation failed");
+                goto out;
+        }
+
+        gf_uuid_copy (req_ctx->uuid, MY_UUID);
 
         /* we are printing the detach status for issue of detach start
          * by then we need the op to be GD_OP_DETACH_TIER_STATUS for it to
@@ -1278,15 +1282,12 @@ glusterd_op_tier_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict,
          */
 
         if (op == GD_OP_REMOVE_TIER_BRICK)
-                data->op = GD_OP_DETACH_TIER_STATUS;
+                req_ctx->op = GD_OP_DETACH_TIER_STATUS;
         else
-                data->op = op;
-        data->dict = dict;
+                req_ctx->op = op;
 
+        req_ctx->dict = dict;
         txn_id = &priv->global_txn_id;
-
-        req_ctx = data;
-        GF_VALIDATE_OR_GOTO (this->name, req_ctx, out);
         CDS_INIT_LIST_HEAD (&opinfo.pending_bricks);
 
         ret = dict_get_bin (req_ctx->dict, "transaction_id", (void **)&txn_id);
@@ -1309,7 +1310,7 @@ glusterd_op_tier_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict,
                          (gd1_mgmt_brick_op_req **)&req,
                          req_ctx->dict);
 
-                if (ret) {
+                if (ret || !req) {
                         gf_msg (this->name, GF_LOG_ERROR, 0,
                                 GD_MSG_BRICK_OP_PAYLOAD_BUILD_FAIL,
                                 "Failed to build brick op payload during "
@@ -1334,15 +1335,15 @@ glusterd_op_tier_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict,
                         goto out;
                 }
 
-                GD_SYNCOP (rpc, (&args), NULL, glusterd_tier_status_cbk, req,
-                           &gd_brick_prog, req->op, xdr_gd1_mgmt_brick_op_req);
+                GD_SYNCOP (rpc, (&args), NULL, glusterd_tier_status_cbk,
+                           req, &gd_brick_prog, req->op,
+                           xdr_gd1_mgmt_brick_op_req);
+
+                if (req->input.input_val)
+                        GF_FREE (req->input.input_val);
+                GF_FREE (req);
+                req = NULL;
 
-                if (req != NULL) {
-                        if (req->input.input_val)
-                                GF_FREE (req->input.input_val);
-                        GF_FREE (req);
-                        req = NULL;
-                }
                 if (!ret)
                         pending_bricks++;
 
@@ -1355,9 +1356,7 @@ glusterd_op_tier_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict,
                       "'Volume %s' to %d bricks", gd_op_list[req_ctx->op],
                       pending_bricks);
         opinfo.brick_pending_count = pending_bricks;
-
 out:
-
         if (ret)
                 opinfo.op_ret = ret;
 
@@ -1371,6 +1370,9 @@ out:
         if (args.errstr)
                 GF_FREE (args.errstr);
 
+        if (req_ctx)
+                GF_FREE (req_ctx);
+
         gf_msg_debug (this ? this->name : "glusterd", 0,
                       "Returning %d. Failed to get tier status", ret);
         return ret;