Patch "tracing: Fix kmemleak in instance_rmdir" has been added to the 3.18-stable tree

This is a note to let you know that I've just added the patch titled

tracing: Fix kmemleak in instance_rmdir

to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
tracing-fix-kmemleak-in-instance_rmdir.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Chunyu Hu <[email protected]>
Date: Thu, 20 Jul 2017 18:36:09 +0800
Subject: tracing: Fix kmemleak in instance_rmdir

From: Chunyu Hu <[email protected]>

commit db9108e054700c96322b0f0028546aa4e643cf0b upstream.

Hit the kmemleak when executing instance_rmdir, it forgot releasing mem of tracing_cpumask. With this fix, the warn does not appear any more.

unreferenced object 0xffff93a8dfaa7c18 (size 8):
comm "mkdir", pid 1436, jiffies 4294763622 (age 9134.308s) hex dump (first 8 bytes):
ff ff ff ff ff ff ff ff ........
backtrace:

    [<ffffffff88b6567a>] kmemleak_alloc+0x4a/0xa0
    [<ffffffff8861ea41>] __kmalloc_node+0xf1/0x280
    [<ffffffff88b505d3>] alloc_cpumask_var_node+0x23/0x30
    [<ffffffff88b5060e>] alloc_cpumask_var+0xe/0x10
    [<ffffffff88571ab0>] instance_mkdir+0x90/0x240
    [<ffffffff886e5100>] tracefs_syscall_mkdir+0x40/0x70
    [<ffffffff886565c9>] vfs_mkdir+0x109/0x1b0
    [<ffffffff8865b1d0>] SyS_mkdir+0xd0/0x100
    [<ffffffff88403857>] do_syscall_64+0x67/0x150
    [<ffffffff88b710e7>] return_from_SYSCALL_64+0x0/0x6a
    [<ffffffffffffffff>] 0xffffffffffffffff

---
 kernel/trace/trace.c |    1 +
 1 file changed, 1 insertion(+)

@@ -6405,6 +6405,7 @@ static int instance_delete(const char *n
 	debugfs_remove_recursive(tr->dir);
 	free_trace_buffers(tr);
 
+	free_cpumask_var(tr->tracing_cpumask);
 	kfree(tr->name);
 	kfree(tr);
 

Patches currently in stable-queue which might be from [email protected] are

queue-3.18/tracing-fix-kmemleak-in-instance_rmdir.patch