From: Eric Biggers ebiggers@google.com

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") Cc: stable@vger.kernel.org # v4.10+ Signed-off-by: Eric Biggers ebiggers@google.com --- fs/ubifs/dir.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 417fe0b29f23..ef820f803176 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -1216,10 +1216,8 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry, 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 *dir, struct dentry *dentry, 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 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry, fscrypt_free_filename(&nm); out_budg: ubifs_release_budget(c, &req); + kfree(sd); return err; }