linux-kernel - [PATCH 4.9 27/54] fscrypt: dont set policy for a dead directory

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Message-Id: <20190718030051.512374141@linuxfoundation.org>
Date:   Thu, 18 Jul 2019 12:01:57 +0900
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hongjie Fang <hongjiefang@...micro.com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH 4.9 27/54] fscrypt: dont set policy for a dead directory

From: Hongjie Fang <hongjiefang@...micro.com>

commit 5858bdad4d0d0fc18bf29f34c3ac836e0b59441f upstream.

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@...r.kernel.org> # v4.1+
Signed-off-by: Hongjie Fang <hongjiefang@...micro.com>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/crypto/policy.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -114,6 +114,8 @@ int fscrypt_process_policy(struct file *
 	if (!inode_has_encryption_context(inode)) {
 		if (!S_ISDIR(inode->i_mode))
 			ret = -ENOTDIR;
+		else if (IS_DEADDIR(inode))
+			ret = -ENOENT;
 		else if (!inode->i_sb->s_cop->empty_dir)
 			ret = -EOPNOTSUPP;
 		else if (!inode->i_sb->s_cop->empty_dir(inode))