From ce840284929b75dbbf062e0ce7fcb78a63b08b5e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?M=C3=A5rten=20Lindahl?= Date: Thu, 30 Mar 2023 11:32:14 +0200 Subject: [PATCH] ubifs: Free memory for tmpfile name MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit commit 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3 upstream. When opening a ubifs tmpfile on an encrypted directory, function fscrypt_setup_filename allocates memory for the name that is to be stored in the directory entry, but after the name has been copied to the directory entry inode, the memory is not freed. When running kmemleak on it we see that it is registered as a leak. The report below is triggered by a simple program 'tmpfile' just opening a tmpfile: unreferenced object 0xffff88810178f380 (size 32): comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s) backtrace: __kmem_cache_alloc_node __kmalloc fscrypt_setup_filename ubifs_tmpfile vfs_tmpfile path_openat Free this memory after it has been copied to the inode. Signed-off-by: Mårten Lindahl Reviewed-by: Zhihao Cheng Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger Signed-off-by: Greg Kroah-Hartman --- fs/ubifs/dir.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index e7c36e3a9b9e..7717d23906db 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -488,6 +488,7 @@ static int ubifs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, unlock_2_inodes(dir, inode); ubifs_release_budget(c, &req); + fscrypt_free_filename(&nm); return 0;