NULL dereference fixes in code base after running with 'clang'

* 212 logical (NULL deref/divide by zero) errors reduced to 28
  (27 of them in contrib/ and lex part of codebase, 1 is invalid)
* 11 API errors reduced to 0

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 966 (NULL check for avoiding NULL dereferencing of pointers..)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=966

4 files changed, 17 insertions, 16 deletions

diff --git a/xlators/protocol/server/src/server-handshake.c b/xlators/protocol/server/src/server-handshake.c
index bc4d4afa2..94586d20c 100644
--- a/xlators/protocol/server/src/server-handshake.c
+++ b/xlators/protocol/server/src/server-handshake.c
@@ -614,7 +614,7 @@ server_setvolume (rpcsvc_request_t *req)
 fail:
         rsp.dict.dict_len = dict_serialized_length (reply);
         if (rsp.dict.dict_len < 0) {
-                gf_log (this->name, GF_LOG_DEBUG,
+                gf_log ("server-handshake", GF_LOG_DEBUG,
                         "failed to get serialized length of reply dict");
                 op_ret   = -1;
                 op_errno = EINVAL;
@@ -627,7 +627,7 @@ fail:
                 if (rsp.dict.dict_val) {
                         ret = dict_serialize (reply, rsp.dict.dict_val);
                         if (ret < 0) {
-                                gf_log (this->name, GF_LOG_DEBUG,
+                                gf_log ("server-handshake", GF_LOG_DEBUG,
                                         "failed to serialize reply dict");
                                 op_ret = -1;
                                 op_errno = -ret;
diff --git a/xlators/protocol/server/src/server-helpers.c b/xlators/protocol/server/src/server-helpers.c
index 11c489e88..216204a8b 100644
--- a/xlators/protocol/server/src/server-helpers.c
+++ b/xlators/protocol/server/src/server-helpers.c
@@ -541,15 +541,17 @@ server_connection_destroy (xlator_t *this, server_connection_t *conn)
                 INIT_LIST_HEAD (&file_lockers);
                 INIT_LIST_HEAD (&dir_lockers);
 
-                LOCK (&ltable->lock);
-                {
-                        list_splice_init (&ltable->file_lockers,
-                                          &file_lockers);
+                if (ltable) {
+                        LOCK (&ltable->lock);
+                        {
+                                list_splice_init (&ltable->file_lockers,
+                                                  &file_lockers);
 
-                        list_splice_init (&ltable->dir_lockers, &dir_lockers);
+                                list_splice_init (&ltable->dir_lockers, &dir_lockers);
+                        }
+                        UNLOCK (&ltable->lock);
+                        GF_FREE (ltable);
                 }
-                UNLOCK (&ltable->lock);
-                GF_FREE (ltable);
 
                 flock.l_type  = F_UNLCK;
                 flock.l_start = 0;
@@ -1030,7 +1032,7 @@ server_print_params (char *str, int size, server_state_t *state)
                                     "wbflags=%d,", state->wbflags);
         if (state->size)
                 filled += snprintf (str + filled, size - filled,
-                                    "size=%Zu,", state->size);
+                                    "size=%zu,", state->size);
         if (state->offset)
                 filled += snprintf (str + filled, size - filled,
                                     "offset=%"PRId64",", state->offset);
diff --git a/xlators/protocol/server/src/server.c b/xlators/protocol/server/src/server.c
index 104274edd..a7501babb 100644
--- a/xlators/protocol/server/src/server.c
+++ b/xlators/protocol/server/src/server.c
@@ -593,10 +593,9 @@ init (xlator_t *this)
 
         ret = 0;
 out:
-        if (ret)
+        if (ret && this)
                 this->fini (this);
 
-
         return ret;
 }
 
diff --git a/xlators/protocol/server/src/server3_1-fops.c b/xlators/protocol/server/src/server3_1-fops.c
index 686c0350d..c04861ddf 100644
--- a/xlators/protocol/server/src/server3_1-fops.c
+++ b/xlators/protocol/server/src/server3_1-fops.c
@@ -4737,7 +4737,7 @@ server_lookup (rpcsvc_request_t *req)
                 if (buf == NULL) {
                         gf_log (conn->bound_xl->name, GF_LOG_ERROR,
                                 "out of memory");
-                        goto err;
+                        goto out;
                 }
 
                 ret = dict_unserialize (buf, args.dict.dict_len,
@@ -4748,7 +4748,7 @@ server_lookup (rpcsvc_request_t *req)
                                 "unserialize req-buffer to dictionary",
                                 frame->root->unique, state->resolve.path,
                                 state->resolve.ino);
-                        goto err;
+                        goto out;
                 }
 
                 state->dict = xattr_req;
@@ -4761,7 +4761,7 @@ server_lookup (rpcsvc_request_t *req)
         resolve_and_resume (frame, server_lookup_resume);
 
         return 0;
-err:
+out:
         if (xattr_req)
                 dict_unref (xattr_req);
 
@@ -4771,7 +4771,7 @@ err:
 
         server_lookup_cbk (frame, NULL, frame->this, -1, EINVAL, NULL, NULL,
                            NULL, NULL);
-
+err:
         return 0;
 }