Patch "Btrfs: use kmem_cache_free when freeing entry in inode cache" has been added to the 4.1-stable tree

Patch "Btrfs: use kmem_cache_free when freeing entry in inode cache" has been added to the 4.1-stable tree

[gregkh]

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

    Btrfs: use kmem_cache_free when freeing entry in inode cache

to the 4.1-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:
     btrfs-use-kmem_cache_free-when-freeing-entry-in-inode-cache.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c3f4a1685bb87e59c886ee68f7967eae07d4dffa Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@suse.com>
Date: Sat, 13 Jun 2015 06:52:56 +0100
Subject: Btrfs: use kmem_cache_free when freeing entry in inode cache

From: Filipe Manana <fdmanana@suse.com>

commit c3f4a1685bb87e59c886ee68f7967eae07d4dffa upstream.

The free space entries are allocated using kmem_cache_zalloc(),
through __btrfs_add_free_space(), therefore we should use
kmem_cache_free() and not kfree() to avoid any confusion and
any potential problem. Looking at the kfree() definition at
mm/slab.c it has the following comment:

  /*
   * (...)
   *
   * Don't free memory not originally allocated by kmalloc()
   * or you will run into trouble.
   */

So better be safe and use kmem_cache_free().

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/btrfs/inode-map.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -271,7 +271,7 @@ void btrfs_unpin_free_ino(struct btrfs_r
 		__btrfs_add_free_space(ctl, info->offset, count);
 free:
 		rb_erase(&info->offset_index, rbroot);
-		kfree(info);
+		kmem_cache_free(btrfs_free_space_cachep, info);
 	}
 }
 


Patches currently in stable-queue which might be from fdmanana@suse.com are

queue-4.1/btrfs-fix-file-corruption-after-cloning-inline-extents.patch
queue-4.1/btrfs-fix-race-between-caching-kthread-and-returning-inode-to-inode-cache.patch
queue-4.1/btrfs-fix-list-transaction-pending_ordered-corruption.patch
queue-4.1/btrfs-fix-memory-leak-in-the-extent_same-ioctl.patch
queue-4.1/btrfs-use-kmem_cache_free-when-freeing-entry-in-inode-cache.patch
queue-4.1/btrfs-fix-fsync-data-loss-after-append-write.patch