From: Filipe Manana <fdmanana@suse.com>
Date: Mon, 3 Apr 2017 14:57:17 +0000 (+0100)
Subject: Btrfs: fix extent map leak during fallocate error path
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=be2d253cc98244765323a7c94cc1ac5cd5a17072;p=openwrt%2Fstaging%2Fblogic.git

Btrfs: fix extent map leak during fallocate error path

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>
---

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 48dfb8e4baf2..56304c400db5 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2856,8 +2856,10 @@ static long btrfs_fallocate(struct file *file, int mode,
 			}
 			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