fscrypt: don't set policy for a dead directory
The directory may have been removed when entering fscrypt_ioctl_set_policy(). If so, the empty_dir() check will return error for ext4 file system. ext4_rmdir() sets i_size = 0, then ext4_empty_dir() reports an error because 'inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)'. If the fs is mounted with errors=panic, it will trigger a panic issue. Add the check IS_DEADDIR() to fix this problem. Fixes: 9bd8212f ("ext4 crypto: add encryption policy and password salt support") Cc: <stable@vger.kernel.org> # v4.1+ Signed-off-by: NHongjie Fang <hongjiefang@asrmicro.com> Signed-off-by: NEric Biggers <ebiggers@google.com>
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