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Btrfs: add tree block level sanity check

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With a users corrupted fs I was getting weird behavior and panics and it turns
out it was because one of his tree blocks had a bogus header level.  So add this
to the sanity checks in the endio handler for tree blocks.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-04-23 11:30:14 -04:00
parent 5ec8dca761
commit 1c24c3ce6a
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/disk-io.c
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@ -613,6 +613,12 @@ static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
goto err; goto err;
} }
found_level = btrfs_header_level(eb); found_level = btrfs_header_level(eb);
if (found_level >= BTRFS_MAX_LEVEL) {
btrfs_info(root->fs_info, "bad tree block level %d\n",
(int)btrfs_header_level(eb));
ret = -EIO;
goto err;
}
btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
eb, found_level); eb, found_level);