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Btrfs: fix extent map leak during fallocate error path

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[ Upstream commit be2d253cc9 ]

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>
This commit is contained in:
Filipe Manana
2017-04-03 15:57:17 +01:00
committed by Greg Kroah-Hartman
parent 7016b20cab
commit dfe9db1d7d
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/file.c
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@@ -2817,8 +2817,10 @@ 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