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btrfs-progs: fix unaligned u64 access in btrfs_alloc_data_chunk 

The key.offset member is not well-aligned as the key is packed, use a
temporary variable to pass the argument. Reported by ASAN in misc test
002.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-11-04 15:11:54 +01:00
parent 9e0dd182b4
commit 92576929fb
1 changed files with 4 additions and 1 deletions
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5
volumes.c
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@ -1080,9 +1080,12 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
key.offset = *start; key.offset = *start;
dev_offset = *start; dev_offset = *start;
} else { } else {
u64 tmp;
ret = find_next_chunk(chunk_root, ret = find_next_chunk(chunk_root,
BTRFS_FIRST_CHUNK_TREE_OBJECTID, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
&key.offset); &tmp);
key.offset = tmp;
if (ret) if (ret)
return ret; return ret;
} }