6 files changed, 34 insertions, 24 deletions

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 83a2970295d1..6bd4a90d1991 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1021,9 +1021,6 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
  * @seq: netlink audit message sequence (serial) number
  * @data: payload data
  * @datasz: size of payload data
- * @loginuid: loginuid of sender
- * @sessionid: sessionid for netlink audit message
- * @sid: SE Linux Security ID of sender
  */
 int audit_receive_filter(int type, int pid, int seq, void *data, size_t datasz)
 {
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2a9926275f80..a7c9e6ddb979 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1686,11 +1686,14 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
                  */
                 cgroup_drop_root(opts.new_root);
 
-                if (((root->flags | opts.flags) & CGRP_ROOT_SANE_BEHAVIOR) &&
-                    root->flags != opts.flags) {
-                        pr_err("cgroup: sane_behavior: new mount options should match the existing superblock\n");
-                        ret = -EINVAL;
-                        goto drop_new_super;
+                if (root->flags != opts.flags) {
+                        if ((root->flags | opts.flags) & CGRP_ROOT_SANE_BEHAVIOR) {
+                                pr_err("cgroup: sane_behavior: new mount options should match the existing superblock\n");
+                                ret = -EINVAL;
+                                goto drop_new_super;
+                        } else {
+                                pr_warning("cgroup: new mount options do not match the existing superblock, will be ignored\n");
+                        }
                 }
 
                 /* no subsys rebinding, so refcounts don't change */
@@ -2699,13 +2702,14 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
                 goto out;
         }
 
+        cfe->type = (void *)cft;
+        cfe->dentry = dentry;
+        dentry->d_fsdata = cfe;
+        simple_xattrs_init(&cfe->xattrs);
+
         mode = cgroup_file_mode(cft);
         error = cgroup_create_file(dentry, mode | S_IFREG, cgrp->root->sb);
         if (!error) {
-                cfe->type = (void *)cft;
-                cfe->dentry = dentry;
-                dentry->d_fsdata = cfe;
-                simple_xattrs_init(&cfe->xattrs);
                 list_add_tail(&cfe->node, &parent->files);
                 cfe = NULL;
         }
@@ -2953,11 +2957,8 @@ struct cgroup *cgroup_next_descendant_pre(struct cgroup *pos,
         WARN_ON_ONCE(!rcu_read_lock_held());
 
         /* if first iteration, pretend we just visited @cgroup */
-        if (!pos) {
-                if (list_empty(&cgroup->children))
-                        return NULL;
+        if (!pos)
                 pos = cgroup;
-        }
 
         /* visit the first child if exists */
         next = list_first_or_null_rcu(&pos->children, struct cgroup, sibling);
@@ -2965,14 +2966,14 @@ struct cgroup *cgroup_next_descendant_pre(struct cgroup *pos,
                 return next;
 
         /* no child, visit my or the closest ancestor's next sibling */
-        do {
+        while (pos != cgroup) {
                 next = list_entry_rcu(pos->sibling.next, struct cgroup,
                                       sibling);
                 if (&next->sibling != &pos->parent->children)
                         return next;
 
                 pos = pos->parent;
-        } while (pos != cgroup);
+        }
 
         return NULL;
 }
diff --git a/kernel/range.c b/kernel/range.c
index 071b0ab455cb..eb911dbce267 100644
--- a/kernel/range.c
+++ b/kernel/range.c
@@ -48,9 +48,11 @@ int add_range_with_merge(struct range *range, int az, int nr_range,
                 final_start = min(range[i].start, start);
                 final_end = max(range[i].end, end);
 
-                range[i].start = final_start;
-                range[i].end =  final_end;
-                return nr_range;
+                /* clear it and add it back for further merge */
+                range[i].start = 0;
+                range[i].end =  0;
+                return add_range_with_merge(range, az, nr_range,
+                        final_start, final_end);
         }
 
         /* Need to add it: */
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index b59aea2c48c2..e444ff88f0a4 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -620,6 +620,9 @@ int ring_buffer_poll_wait(struct ring_buffer *buffer, int cpu,
         if (cpu == RING_BUFFER_ALL_CPUS)
                 work = &buffer->irq_work;
         else {
+                if (!cpumask_test_cpu(cpu, buffer->cpumask))
+                        return -EINVAL;
+
                 cpu_buffer = buffer->buffers[cpu];
                 work = &cpu_buffer->irq_work;
         }
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ae6fa2d1cdf7..4d79485b3237 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6216,10 +6216,15 @@ __init static int tracer_alloc_buffers(void)
 
         trace_init_cmdlines();
 
-        register_tracer(&nop_trace);
-
+        /*
+         * register_tracer() might reference current_trace, so it
+         * needs to be set before we register anything. This is
+         * just a bootstrap of current_trace anyway.
+         */
         global_trace.current_trace = &nop_trace;
 
+        register_tracer(&nop_trace);
+
         /* All seems OK, enable tracing */
         tracing_disabled = 0;
 
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 7a0cf68027cc..27963e2bf4bf 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2072,8 +2072,10 @@ event_enable_func(struct ftrace_hash *hash,
  out_reg:
         /* Don't let event modules unload while probe registered */
         ret = try_module_get(file->event_call->mod);
-        if (!ret)
+        if (!ret) {
+                ret = -EBUSY;
                 goto out_free;
+        }
 
         ret = __ftrace_event_enable_disable(file, 1, 1);
         if (ret < 0)