the directory maybe has been removed when enter fscrypt_ioctl_set_policy(). it this case, 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: 9bd8212f981e ("ext4 crypto: add encryption policy and password salt support") Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Hongjie Fang hongjiefang@asrmicro.com --- fs/crypto/policy.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c index bd7eaf9..a4eca6e 100644 --- a/fs/crypto/policy.c +++ b/fs/crypto/policy.c @@ -81,6 +81,8 @@ int fscrypt_ioctl_set_policy(struct file *filp, const void __user *arg) if (ret == -ENODATA) { if (!S_ISDIR(inode->i_mode)) ret = -ENOTDIR; + else if (IS_DEADDIR(inode)) + ret = -ENOENT; else if (!inode->i_sb->s_cop->empty_dir(inode)) ret = -ENOTEMPTY; else