4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vasily Averin <v...@virtuozzo.com>


[ Upstream commit 0e18dd12064e07519f7cbff4149ca7fff620cbed ]

perf with --namespace key leaks various memory objects including namespaces

  4.14.0+
  pid_namespace          1     12   2568   12    8
  user_namespace         1     39    824   39    8
  net_namespace          1      5   6272    5    8

This happen because perf_fill_ns_link_info() struct patch ns_path:
during initialization ns_path incremented counters on related mnt and dentry,
but without lost path_put nobody decremented them back.
Leaked dentry is name of related namespace,
and its leak does not allow to free unused namespace.

Signed-off-by: Vasily Averin <v...@virtuozzo.com>
Acked-by: Peter Zijlstra <pet...@infradead.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Hari Bathini <hbath...@linux.vnet.ibm.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Fixes: commit e422267322cd ("perf: Add PERF_RECORD_NAMESPACES to include 
namespaces related info")
Link: 
http://lkml.kernel.org/r/c510711b-3904-e5e1-d296-61273d211...@virtuozzo.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 kernel/events/core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6756,6 +6756,7 @@ static void perf_fill_ns_link_info(struc
                ns_inode = ns_path.dentry->d_inode;
                ns_link_info->dev = new_encode_dev(ns_inode->i_sb->s_dev);
                ns_link_info->ino = ns_inode->i_ino;
+               path_put(&ns_path);
        }
 }
 


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