some check added to the variables after GF_CALLOC

handles some NULL dereference problems
(reported by clang when ran with code where '#define GF_CALLOC NULL').

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

8 files changed, 23 insertions, 10 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-sm.c b/xlators/mgmt/glusterd/src/glusterd-sm.c
index b1a4c0d8a57..1ac3f902bf3 100644
--- a/xlators/mgmt/glusterd/src/glusterd-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-sm.c
@@ -550,6 +550,8 @@ glusterd_friend_sm ()
                                 event->peerinfo = peerinfo;
                         }
 
+                        if (!peerinfo)
+                                goto out;
 
                         state = glusterd_friend_state_table[peerinfo->state.state];
 
@@ -573,7 +575,7 @@ glusterd_friend_sm ()
                                 gf_log ("glusterd", GF_LOG_ERROR, "Unable to transition"
                                         "state from %d to %d", peerinfo->state.state,
                                          state[event_type].next_state);
-                                return ret;
+                                goto out;
                         }
 
                         GF_FREE (event);
@@ -582,7 +584,7 @@ glusterd_friend_sm ()
 
 
         ret = 0;
-
+out:
         return ret;
 }
 
diff --git a/xlators/performance/write-behind/src/write-behind.c b/xlators/performance/write-behind/src/write-behind.c
index 4095527d828..d3f24a5909b 100644
--- a/xlators/performance/write-behind/src/write-behind.c
+++ b/xlators/performance/write-behind/src/write-behind.c
@@ -564,6 +564,7 @@ out:
                 }
 
                 GF_FREE (local);
+                local = NULL;
         }
 
         if (iobref != NULL) {
@@ -579,10 +580,11 @@ out:
                  * had we winded these requests, we would have unrefed
                  * in wb_sync_cbk.
                  */
-
-                list_for_each_entry_safe (request, dummy, &local->winds,
-                                          winds) {
-                        wb_request_unref (request);
+                if (local) {
+                        list_for_each_entry_safe (request, dummy, &local->winds,
+                                                  winds) {
+                                wb_request_unref (request);
+                        }
                 }
 
                 if (file != NULL) {
diff --git a/xlators/protocol/client/src/client3_1-fops.c b/xlators/protocol/client/src/client3_1-fops.c
index 06b33348493..a007803b7c3 100644
--- a/xlators/protocol/client/src/client3_1-fops.c
+++ b/xlators/protocol/client/src/client3_1-fops.c
@@ -2080,7 +2080,7 @@ out:
                 GF_FREE (fdctx);
         }
 
-        if (ret)
+        if (ret && fr)
                 STACK_DESTROY (fr->root);
 
         return ret;
diff --git a/xlators/protocol/legacy/server/src/server-protocol.c b/xlators/protocol/legacy/server/src/server-protocol.c
index 839c6a55745..e6c668d1567 100644
--- a/xlators/protocol/legacy/server/src/server-protocol.c
+++ b/xlators/protocol/legacy/server/src/server-protocol.c
@@ -4914,7 +4914,8 @@ _volfile_update_checksum (xlator_t *this, char *key, uint32_t checksum)
         if (!temp_volfile) {
                 temp_volfile = GF_CALLOC (1, sizeof (struct _volfile_ctx),
                                           gf_server_mt_volfile_ctx);
-
+                if (!temp_volfile)
+                        goto out;
                 temp_volfile->next  = conf->volfile;
                 temp_volfile->key   = (key)? gf_strdup (key): NULL;
                 temp_volfile->checksum = checksum;
diff --git a/xlators/protocol/server/src/server-handshake.c b/xlators/protocol/server/src/server-handshake.c
index d386e9ce55b..f9a4bca364c 100644
--- a/xlators/protocol/server/src/server-handshake.c
+++ b/xlators/protocol/server/src/server-handshake.c
@@ -91,7 +91,8 @@ _volfile_update_checksum (xlator_t *this, char *key, uint32_t checksum)
         if (!temp_volfile) {
                 temp_volfile = GF_CALLOC (1, sizeof (struct _volfile_ctx),
                                           gf_server_mt_volfile_ctx_t);
-
+                if (!temp_volfile)
+                        goto out;
                 temp_volfile->next  = conf->volfile;
                 temp_volfile->key   = (key)? gf_strdup (key): NULL;
                 temp_volfile->checksum = checksum;
diff --git a/xlators/protocol/server/src/server-helpers.c b/xlators/protocol/server/src/server-helpers.c
index 37418ac1de4..84c66d1141d 100644
--- a/xlators/protocol/server/src/server-helpers.c
+++ b/xlators/protocol/server/src/server-helpers.c
@@ -684,6 +684,8 @@ server_connection_get (xlator_t *this, const char *id)
                 if (!conn) {
                         conn = (void *) GF_CALLOC (1, sizeof (*conn),
                                                    gf_server_mt_conn_t);
+                        if (!conn)
+                                goto unlock;
 
                         conn->id = gf_strdup (id);
                         conn->fdtable = gf_fd_fdtable_alloc ();
@@ -697,6 +699,7 @@ server_connection_get (xlator_t *this, const char *id)
                 conn->ref++;
                 conn->active_transports++;
 	}
+unlock:
 	pthread_mutex_unlock (&conf->mutex);
 
         return conn;
diff --git a/xlators/protocol/server/src/server-resolve.c b/xlators/protocol/server/src/server-resolve.c
index 77336216f19..91cf0d96f30 100644
--- a/xlators/protocol/server/src/server-resolve.c
+++ b/xlators/protocol/server/src/server-resolve.c
@@ -75,6 +75,8 @@ prepare_components (call_frame_t *frame)
         count = component_count (resolve->path);
         components = GF_CALLOC (sizeof (*components), count,
                                 gf_server_mt_resolv_comp_t);
+        if (!components)
+                goto out;
         resolve->components = components;
 
         components[0].basename = "";
@@ -90,7 +92,7 @@ prepare_components (call_frame_t *frame)
                         i++;
                 }
         }
-
+out:
         return 0;
 }
 
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index 2810bbd6a8c..da5156709d1 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -179,6 +179,8 @@ _posix_xattr_get_set (dict_t *xattr_req,
 		if (xattr_size > 0) {
 			value = GF_CALLOC (1, xattr_size + 1,
                                            gf_posix_mt_char);
+                        if (!value)
+                                return;
 
 			sys_lgetxattr (filler->real_path, key, value,
                                        xattr_size);