In the Linux kernel, the following vulnerability has been resolved:
erofs: fix order >= MAX_ORDER warning due to crafted negative i_size
As syzbot reported [1], the root cause is that i_size field is a signed type, and negative i_size is also less than EROFS_BLKSIZ. As a consequence, its handled as fast symlink unexpectedly.
Lets fall back to the generic path to deal with such unusual i_size.
[1] https://lore.kernel.org/r/000000000000ac8efa05e7feaa1f@google.com