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btrfs-progs: fix wrong max system array size check in user space 

For system chunk array,
We copy a "disk_key" and an chunk item each time,
so there should be enough space to hold both of them,
not only the chunk item.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Gui Hecheng 2014-04-21 20:13:31 +08:00 committed by David Sterba
parent dae7456c7f
commit 4dbbcafd95
1 changed files with 2 additions and 1 deletions
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3
volumes.c
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@ -630,7 +630,8 @@ int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
u8 *ptr; u8 *ptr;
array_size = btrfs_super_sys_array_size(super_copy); array_size = btrfs_super_sys_array_size(super_copy);
if (array_size + item_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) if (array_size + item_size + sizeof(disk_key)
> BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)
return -EFBIG; return -EFBIG;
ptr = super_copy->sys_chunk_array + array_size; ptr = super_copy->sys_chunk_array + array_size;