f2fs crypto: handle unexpected lack of encryption keys

commit ae1086686487f13130937918ca91d920c1daafcb upstream.

This patch syncs f2fs with commit abdd438b26b4 ("ext4 crypto: handle
unexpected lack of encryption keys") from ext4.

Fix up attempts by users to try to write to a file when they don't
have access to the encryption key.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/f2fs/crypto_policy.c b/fs/f2fs/crypto_policy.c
index d4a96af513c22f28ea1242496286d4ff1a606567..596f02490f27013ace3ee01b817a48c1e46e0b74 100644 (file)
--- a/fs/f2fs/crypto_policy.c
+++ b/fs/f2fs/crypto_policy.c
@@ -192,7 +192,8 @@ int f2fs_inherit_context(struct inode *parent, struct inode *child,
                return res;
 
        ci = F2FS_I(parent)->i_crypt_info;
-       BUG_ON(ci == NULL);
+       if (ci == NULL)
+               return -ENOKEY;
 
        ctx.format = F2FS_ENCRYPTION_CONTEXT_FORMAT_V1;
 

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index ea272be62677004d29c8018691ea442c2c992bb1..5a322bc00ac44326f639bc30889e455b6fdfaedb 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -425,6 +425,8 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
                err = f2fs_get_encryption_info(inode);
                if (err)
                        return 0;
+               if (!f2fs_encrypted_inode(inode))
+                       return -ENOKEY;
        }
 
        /* we don't need to use inline_data strictly */
@@ -444,7 +446,9 @@ static int f2fs_file_open(struct inode *inode, struct file *filp)
        if (!ret && f2fs_encrypted_inode(inode)) {
                ret = f2fs_get_encryption_info(inode);
                if (ret)
-                       ret = -EACCES;
+                       return -EACCES;
+               if (!f2fs_encrypted_inode(inode))
+                       return -ENOKEY;
        }
        return ret;
 }