From 1c24c3ce6a8022ab225f44160bfddc92a5a6e435 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Tue, 23 Apr 2013 11:30:14 -0400 Subject: Btrfs: add tree block level sanity check 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 --- fs/btrfs/disk-io.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'fs') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index bb6cdbda4f56..c7d8fb0dbff6 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -613,6 +613,12 @@ static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, goto err; } 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), eb, found_level); -- cgit v1.2.3