From: Hongjie Fang <hongjiefang@xxxxxxxxxxxx>
commit 5858bdad4d0d0fc18bf29f34c3ac836e0b59441f upstream.
[Please apply to 4.4-stable.]
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: 9bd8212f981e ("ext4 crypto: add encryption policy and password salt support")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.1+
Signed-off-by: Hongjie Fang <hongjiefang@xxxxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
fs/ext4/crypto_policy.c | 2 ++
fs/f2fs/crypto_policy.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/fs/ext4/crypto_policy.c b/fs/ext4/crypto_policy.c
index e4f4fc4e56abee..77bd7bfb632913 100644
--- a/fs/ext4/crypto_policy.c
+++ b/fs/ext4/crypto_policy.c
@@ -111,6 +111,8 @@ int ext4_process_policy(const struct ext4_encryption_policy *policy,
if (!ext4_inode_has_encryption_context(inode)) {
if (!S_ISDIR(inode->i_mode))
return -EINVAL;
+ if (IS_DEADDIR(inode))
+ return -ENOENT;
if (!ext4_empty_dir(inode))
return -ENOTEMPTY;
return ext4_create_encryption_context_from_policy(inode,
diff --git a/fs/f2fs/crypto_policy.c b/fs/f2fs/crypto_policy.c
index 884f3f0fe29d32..613ca32ec24887 100644
--- a/fs/f2fs/crypto_policy.c
+++ b/fs/f2fs/crypto_policy.c
@@ -99,6 +99,8 @@ int f2fs_process_policy(const struct f2fs_encryption_policy *policy,
return -EINVAL;
if (!f2fs_inode_has_encryption_context(inode)) {
+ if (IS_DEADDIR(inode))
+ return -ENOENT;
if (!f2fs_empty_dir(inode))
return -ENOTEMPTY;
return f2fs_create_encryption_context_from_policy(inode,
--
2.22.0.410.gd8fdbe21b5-goog
