4.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit 6b46d444146eb8d0b99562795cea8086639d7282 upstream.
ubifs_symlink() forgot to free the kmalloc()'ed buffer holding the
encrypted symlink target, creating a memory leak. Fix it.
(UBIFS could actually encrypt directly into ui->data, removing the
temporary buffer, but that is left for the patch that switches to use
the symlink helper functions.)
Fixes: ca7f85be8d6c ("ubifs: Add support for encrypted symlinks")
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ubifs/dir.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1216,10 +1216,8 @@ static int ubifs_symlink(struct inode *d
ostr.len = disk_link.len;
err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
- if (err) {
- kfree(sd);
+ if (err)
goto out_inode;
- }
sd->len = cpu_to_le16(ostr.len);
disk_link.name = (char *)sd;
@@ -1251,11 +1249,10 @@ static int ubifs_symlink(struct inode *d
goto out_cancel;
mutex_unlock(&dir_ui->ui_mutex);
- ubifs_release_budget(c, &req);
insert_inode_hash(inode);
d_instantiate(dentry, inode);
- fscrypt_free_filename(&nm);
- return 0;
+ err = 0;
+ goto out_fname;
out_cancel:
dir->i_size -= sz_change;
@@ -1268,6 +1265,7 @@ out_fname:
fscrypt_free_filename(&nm);
out_budg:
ubifs_release_budget(c, &req);
+ kfree(sd);
return err;
}