CVE-2023-52569

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: remove BUG() after failure to insert delayed dir index item<br /> <br /> Instead of calling BUG() when we fail to insert a delayed dir index item<br /> into the delayed node&amp;#39;s tree, we can just release all the resources we<br /> have allocated/acquired before and return the error to the caller. This is<br /> fine because all existing call chains undo anything they have done before<br /> calling btrfs_insert_delayed_dir_index() or BUG_ON (when creating pending<br /> snapshots in the transaction commit path).<br /> <br /> So remove the BUG() call and do proper error handling.<br /> <br /> This relates to a syzbot report linked below, but does not fix it because<br /> it only prevents hitting a BUG(), it does not fix the issue where somehow<br /> we attempt to use twice the same index number for different index items.