linux-kernel - [PATCH 4.14 04/36] ubifs: Fix directory size calculation for symlinks

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Date:   Fri, 28 Dec 2018 12:52:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Richard Weinberger <richard@....at>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 04/36] ubifs: Fix directory size calculation for symlinks

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

commit 00ee8b60102862f4daf0814d12a2ea2744fc0b9b upstream

We have to account the name of the symlink and not the target length.

Fixes: ca7f85be8d6c ("ubifs: Add support for encrypted symlinks")
Cc: <stable@...r.kernel.org>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ubifs/dir.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index ef820f803176..4e6e32c0c08a 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1147,8 +1147,7 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
 	struct ubifs_inode *ui;
 	struct ubifs_inode *dir_ui = ubifs_inode(dir);
 	struct ubifs_info *c = dir->i_sb->s_fs_info;
-	int err, len = strlen(symname);
-	int sz_change = CALC_DENT_SIZE(len);
+	int err, sz_change, len = strlen(symname);
 	struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 	struct fscrypt_symlink_data *sd = NULL;
 	struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
@@ -1189,6 +1188,8 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
 	if (err)
 		goto out_budg;
 
+	sz_change = CALC_DENT_SIZE(fname_len(&nm));
+
 	inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
-- 
2.19.1