Merge branch 'akpm' (incoming fixes from Andrew)

Merge misc fixes from Andrew Morton:
 "The audit fixes have been floating around for a while - Al and Eric
  aren't responding to either myself or Kees so I asked Kees to
  re-review them and here they are."

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (22 commits)
  lib/rbtree.c: avoid the use of non-static __always_inline
  MAINTAINERS: Omar had moved
  mm: compaction: partially revert capture of suitable high-order page
  linux/audit.h: move ptrace.h include to kernel header
  kernel/audit.c: avoid negative sleep durations
  audit: catch possible NULL audit buffers
  audit: create explicit AUDIT_SECCOMP event type
  MAINTAINERS: fix a status pattern
  MAINTAINERS: fix arch/arm/plat-omap/include/plat/omap_hwmod.h
  mm: thp: acquire the anon_vma rwsem for write during split
  mm: mmap: annotate vm_lock_anon_vma locking properly for lockdep
  lockdep, rwsem: provide down_write_nest_lock()
  arch/mn10300/Kconfig: select CONFIG_GENERIC_ATOMIC64
  mm: bootmem: fix free_all_bootmem_core() with odd bitmap alignment
  mm: use aligned zone start for pfn_to_bitidx calculation
  fs/exec.c: work around icc miscompilation
  mm: compaction: fix echo 1 > compact_memory return error issue
  mm: memblock: fix wrong memmove size in memblock_merge_regions()
  drivers/video/ssd1307fb.c: fix bit order bug in the byte translation function
  mm: migrate: check page_count of THP before migrating
  ...

1 files changed, 27 insertions, 13 deletions

diff --git a/kernel/audit.c b/kernel/audit.c
index 40414e9143db..d596e5355f15 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -272,6 +272,8 @@ static int audit_log_config_change(char *function_name, int new, int old,
         int rc = 0;
 
         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+        if (unlikely(!ab))
+                return rc;
         audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new,
                          old, from_kuid(&init_user_ns, loginuid), sessionid);
         if (sid) {
@@ -619,6 +621,8 @@ static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
         }
 
         *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
+        if (unlikely(!*ab))
+                return rc;
         audit_log_format(*ab, "pid=%d uid=%u auid=%u ses=%u",
                          task_tgid_vnr(current),
                          from_kuid(&init_user_ns, current_uid()),
@@ -1097,6 +1101,23 @@ static inline void audit_get_stamp(struct audit_context *ctx,
         }
 }
 
+/*
+ * Wait for auditd to drain the queue a little
+ */
+static void wait_for_auditd(unsigned long sleep_time)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        set_current_state(TASK_INTERRUPTIBLE);
+        add_wait_queue(&audit_backlog_wait, &wait);
+
+        if (audit_backlog_limit &&
+            skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
+                schedule_timeout(sleep_time);
+
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(&audit_backlog_wait, &wait);
+}
+
 /* Obtain an audit buffer.  This routine does locking to obtain the
  * audit buffer, but then no locking is required for calls to
  * audit_log_*format.  If the tsk is a task that is currently in a
@@ -1142,20 +1163,13 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 
         while (audit_backlog_limit
                && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
-                if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
-                    && time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
+                if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
+                        unsigned long sleep_time;
 
-                        /* Wait for auditd to drain the queue a little */
-                        DECLARE_WAITQUEUE(wait, current);
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        add_wait_queue(&audit_backlog_wait, &wait);
-
-                        if (audit_backlog_limit &&
-                            skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
-                                schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
-
-                        __set_current_state(TASK_RUNNING);
-                        remove_wait_queue(&audit_backlog_wait, &wait);
+                        sleep_time = timeout_start + audit_backlog_wait_time -
+                                        jiffies;
+                        if ((long)sleep_time > 0)
+                                wait_for_auditd(sleep_time);
                         continue;
                 }
                 if (audit_rate_check() && printk_ratelimit())