Patch "Btrfs: fix extent map leak during fallocate error path" has been added to the 4.9-stable tree

Patch "Btrfs: fix extent map leak during fallocate error path" has been added to the 4.9-stable tree

[gregkh]

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

    Btrfs: fix extent map leak during fallocate error path

to the 4.9-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-fix-extent-map-leak-during-fallocate-error-path.patch
and it can be found in the queue-4.9 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 foo@baz Thu Mar 22 14:40:23 CET 2018
From: Filipe Manana <fdmanana@suse.com>
Date: Mon, 3 Apr 2017 15:57:17 +0100
Subject: Btrfs: fix extent map leak during fallocate error path

From: Filipe Manana <fdmanana@suse.com>


[ Upstream commit be2d253cc98244765323a7c94cc1ac5cd5a17072 ]

If the call to btrfs_qgroup_reserve_data() failed, we were leaking an
extent map structure. The failure can happen either due to an -ENOMEM
condition or, when quotas are enabled, due to -EDQUOT for example.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/btrfs/file.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2817,8 +2817,10 @@ static long btrfs_fallocate(struct file
 			}
 			ret = btrfs_qgroup_reserve_data(inode, cur_offset,
 					last_byte - cur_offset);
-			if (ret < 0)
+			if (ret < 0) {
+				free_extent_map(em);
 				break;
+			}
 		} else {
 			/*
 			 * Do not need to reserve unwritten extent for this


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

queue-4.9/btrfs-fix-incorrect-space-accounting-after-failure-to-insert-inline-extent.patch
queue-4.9/btrfs-fix-extent-map-leak-during-fallocate-error-path.patch
queue-4.9/btrfs-send-fix-file-hole-not-being-preserved-due-to-inline-extent.patch